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From conflue...@apache.org
Subject [CONF] Apache Qpid: QMF Protocol (page edited)
Date Wed, 01 Apr 2009 18:17:01 GMT
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<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/qpid">qpid</a> :
            <a href="http://cwiki.apache.org/confluence/display/qpid/QMF+Protocol">QMF Protocol</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/qpid/QMF+Protocol">QMF Protocol</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~tross">Ted Ross</a>
            <span class="smallfont">(Apr 01, 2009)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=111812&originalVersion=10&revisedVersion=11">(View changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><table cellpadding='5' width='85%' cellspacing='8px' class='infoMacro' border="0" align='center'><colgroup><col width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/information.gif" width="16" height="16" align="absmiddle" alt="" border="0"></td><td><b class="strong">Note</b><br />This page is being updated with protocol changes introduced in M4 (and are unchanged in release 0.5)</td></tr></table>

<h3><a name="QMFProtocol-ProtocolHeader"></a>Protocol Header</h3>

<p>QMF messages are composed of sequences of binary-encoded data fields, in a manner consistent with the 0-10 version of the AMQP specification.</p>

<p>All QMF messages begin with a message header:</p>

<div class="preformatted"><div class="preformattedContent">
<pre>          octet 0      1         2         3         4         5         6         7
        +---------+---------+---------+---------+---------+---------+---------+---------+
        |   'A'   |   'M'   |   '2'   | op-code |                sequence               |
        +---------+---------+---------+---------+---------+---------+---------+---------+
</pre>
</div></div>


<p>The first three octets contain the protocol <b>magic number</b> "AM2" which is used to identify the type and version of the message.</p>

<p>The <b>opcode</b> field identifies the operation represented by the message</p>

<h3><a name="QMFProtocol-MappingQMFMessagestoAMQPMessages"></a>Mapping QMF Messages to AMQP Messages</h3>

<p>QMF messages are carried in the body segments of AMQP messages.  An AMQP message body may contain 1 or more QMF messages.  QMF messages do not span AMQP messages, each QMF messages must be entirely contained within a single AMQP message body.</p>

<h3><a name="QMFProtocol-ProtocolExchangePatterns"></a>Protocol Exchange Patterns</h3>

<p>The following patterns are followed in the design of the protocol:</p>

<ul>
	<li>Request-Response</li>
	<li>Query-Indication</li>
	<li>Unsolicited Indication</li>
</ul>


<h4><a name="QMFProtocol-TheRequestResponsePattern"></a>The Request-Response Pattern</h4>

<p>In the request-response pattern, a requestor sends a <b>request</b> message to one of its peers.  The peer then does one of two things:  If the request can be successfully processed, a single <b>response</b> message is sent back to the requestor.  This response contains the requested results and serves as the positive acknowledgement that the request was successfully completed.</p>

<p>If the request cannot be successfully completed, the peer sends a <b>command complete</b> message back to the requestor with an error code and error text describing what went wrong.</p>

<p>The sequence number in the <b>response</b> or <b>command complete</b> message is the same as the sequence number in the <b>request</b>.</p>

<div class="preformatted"><div class="preformattedContent">
<pre>    Requestor                                                          Peer
        |                                                               |
        | --- Request (seq) ------------------------------------------&gt; |
        |                                                               |
        | &lt;----------------------------------------- Response (seq) --- |
        |                                                               |
</pre>
</div></div>

<div class="preformatted"><div class="preformattedContent">
<pre>    Requestor                                                          Peer
        |                                                               |
        | --- Request (seq) ------------------------------------------&gt; |
        |                                                               |
        | &lt;-------------------------- Command Complete (seq, error) --- |
        |                                                               |
</pre>
</div></div>


<h4><a name="QMFProtocol-TheQueryIndicationPattern"></a>The Query-Indication Pattern</h4>

<p>The query-indication pattern is used when there may be zero or more answers to a question.  In this case, the requestor sends a <b>query</b> message to its peer.  The peer processes the query, sending as many <b>indication</b> messages as needed back to the requestor (zero or more).  Once the last <b>indication</b> has been sent, the peer then sends a <b>command complete</b> message with a success code indicating that the query is complete.</p>

<p>If there is an error in the <b>query</b>, the peer may reply with a <b>command complete</b> message containg an error code.  In this case, no <b>indication</b> messages may be sent.</p>

<p>All <b>indication</b> and <b>command complete</b> messages shall have the same sequence number that appeared in the <b>query</b> message.</p>

<div class="preformatted"><div class="preformattedContent">
<pre>    Requestor                                                          Peer
        |                                                               |
        | --- Query (seq) --------------------------------------------&gt; |
        |                                                               |
        | &lt;--------------------------------------- Indication (seq) --- |
        | &lt;--------------------------------------- Indication (seq) --- |
        | &lt;--------------------------------------- Indication (seq) --- |
        | &lt;--------------------------------------- Indication (seq) --- |
        | &lt;--------------------------------------- Indication (seq) --- |
        |                                                               |
        | &lt;------------------------ Command Complete (seq, success) --- |
        |                                                               |
</pre>
</div></div>

<div class="preformatted"><div class="preformattedContent">
<pre>    Requestor                                                          Peer
        |                                                               |
        | --- Query (seq) --------------------------------------------&gt; |
        |                                                               |
        | &lt;-------------------------- Command Complete (seq, error) --- |
        |                                                               |
</pre>
</div></div>


<h4><a name="QMFProtocol-TheUnsolicitedIndicationPattern"></a>The Unsolicited-Indication Pattern</h4>

<p>The unsolicited-indication pattern is used when one peer needs to send unsolicited information to another peer, or to broadcast information to multiple peers via a topic exchange.  In this case, indication messages are sent with the sequence number field set to zero.</p>

<div class="preformatted"><div class="preformattedContent">
<pre>      Peer                                                             Peer
        |                                                               |
        | &lt;----------------------------------- Indication (seq = 0) --- |
        | &lt;----------------------------------- Indication (seq = 0) --- |
        | &lt;----------------------------------- Indication (seq = 0) --- |
        | &lt;----------------------------------- Indication (seq = 0) --- |
        |                                                               |
</pre>
</div></div>


<h3><a name="QMFProtocol-ObjectIdentifiers"></a>Object Identifiers</h3>

<p>Manageable objects are tagged with a unique 128-bit object identifier.  The object identifier space is owned and managed by the management broker.  Objects managed by a single management broker shall have unique object identifiers.  Objects managed by separate management brokers may have the same object identifier.</p>

<p>If a management console is designed to manage multiple management brokers, it must use the broker identifier as well as the object identifier to ensure global uniqueness.</p>

<div class="preformatted"><div class="preformattedContent">
<pre>first uint64:
         63   60 59              48 47                   28 27                           0
        +-------+------------------+-----------------------+------------------------------+
        | flags |     sequence     |      broker bank      |          agent bank          |
        +-------+------------------+-----------------------+------------------------------+

second uint64:
         63                                                                              0
        +---------------------------------------------------------------------------------+
        |                                     object                                      |
        +---------------------------------------------------------------------------------+
</pre>
</div></div>

<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'>Field</th>
<th class='confluenceTh'>Size (bits)</th>
<th class='confluenceTh'>Description</th>
</tr>
<tr>
<td class='confluenceTd'>flags</td>
<td class='confluenceTd'>4</td>
<td class='confluenceTd'>Reserved, must be zero</td>
</tr>
<tr>
<td class='confluenceTd'>sequence</td>
<td class='confluenceTd'>12</td>
<td class='confluenceTd'>Boot sequence of the agent, or zero for persistent IDs</td>
</tr>
<tr>
<td class='confluenceTd'>broker bank</td>
<td class='confluenceTd'>20</td>
<td class='confluenceTd'>Bank number unique to the broker</td>
</tr>
<tr>
<td class='confluenceTd'>agent bank</td>
<td class='confluenceTd'>28</td>
<td class='confluenceTd'>Bank number unique to the agent</td>
</tr>
<tr>
<td class='confluenceTd'>object</td>
<td class='confluenceTd'>64</td>
<td class='confluenceTd'>Identifier assigned by the agent</td>
</tr>
</tbody></table>

<ul>
	<li>For persistent IDs, sequence is zero</li>
	<li>For non-persistent IDs, sequence is a number which increments each time the management broker is restarted.</li>
</ul>


<h3><a name="QMFProtocol-EstablishingCommunicationBetweenClientandAgent"></a>Establishing Communication Between Client and Agent</h3>

<p>Communication is established between the management client and management agent using normal AMQP procedures.  The client creates a connection to the broker and then establishes a session with its corresponding channel.</p>

<p>Two private queues are then declared (only one if method invocation is not needed).  A management queue is declared and bound to the qpid.management exchange.  If the binding key is "mgmt.#", all management-related messages sent to the exchange will be received by this client.  A more specific binding key will result in a more restricted set of messages being received (see the section on Routing Key Structure below).</p>

<p>If methods are going to be invoked on managed objects, a second private queue must be declared so the client can receive method replies.  This queue is bound to the amq.direct exchange using a routing key equal to the name of the queue.</p>

<p>When a client successfully binds to the qpid.management exchange, the management agent schedules a schema broadcast to be sent to the exchange.  The agent will publish, via the exchange, a description of the schema for all manageable objects in its control.</p>

<div class="preformatted"><div class="preformattedContent">
<pre>      Client                                                          Broker
        |                                                               |
        | --- AMQP Connection and Session Setup ----------------------&gt; |
        |                                                               |
        | --- Queue.declare (private data queue) ---------------------&gt; |
        | --- Bind queue to exchange 'qpid.management' key 'mgmt.#' --&gt; |
        |                                                               |
        | --- Queue.declare (private method-reply queue) -------------&gt; |
        | --- Bind queue to exchange 'amq.direct' --------------------&gt; |
        |                                                               |
        | --- Broker Request -----------------------------------------&gt; |
        | &lt;---------------------------------------- Broker Response --- |
        |                                                               |
        |                                                               |
        |                                                               |
        | &lt;------- Management schema via exchange 'qpid.management' --- |
        |                                                               |
</pre>
</div></div>

<h3><a name="QMFProtocol-BroadcastofConfigurationandInstrumentationUpdates"></a>Broadcast of Configuration and Instrumentation Updates</h3>

<p>The management agent will periodically publish updates to the configuration and instrumentation of management objects under its control.  Under normal circumstances, these updates are published only if they have changed since the last time they were published.  Configuration updates are only published if configuration has changed and instrumentation updates are only published if instrumentation has changed.  The exception to this rule is that after a management client binds to the qpid.management exchange, all configuration and instrumentation records are published as though they had changed whether or not they actually did.</p>

<div class="preformatted"><div class="preformattedContent">
<pre>      Client                                                          Broker
        |                                                               |
        | &lt;------------------ Object properties via 'mgmt.*.prop.#' --- | |
        | &lt;------------------ Object statistics via 'mgmt.*.stat.#' --- | |
        |                                                               | |
        |                                                               | | Publish Interval
        |                                                               | |
        |                                                               | |
        |                                                               | V
        | &lt;------------------ Object properties via 'mgmt.*.prop.#' --- |
        | &lt;------------------ Object statistics via 'mgmt.*.stat.#' --- |
        |                                                               |
</pre>
</div></div>

<h3><a name="QMFProtocol-InvokingaMethodonaManagedObject"></a>Invoking a Method on a Managed Object</h3>

<p>When the management client wishes to invoke a method on a managed object, it sends a method request message to the qpid.management exchange.  The routing key contains the object class and method name (refer to Routing Key Structure below).  The method request must have a header entry (reply-to) that contains the name of the method-reply queue so that the method response can be properly routed back to the requestor.</p>

<p>The method request contains a sequence number that is copied to the method reply.  This number is opaque to the management agent and may be used by the management client to correlate the reply to the request.  The asynchronous nature of requests and replies allows any number of methods to be in-flight at a time.  Note that there is no guarantee that methods will be replied to in the order in which they were requested.</p>

<div class="preformatted"><div class="preformattedContent">
<pre>      Client                                                          Broker
        |                                                               |
        | --- Method Request (to exchange 'qpid.management') ---------&gt; |
        |                                                               |
        |                                                               |
        | &lt;--------------- Method Reply (via exchange 'amq.direct') --- |
        |                                                               |
</pre>
</div></div>


<h3><a name="QMFProtocol-DetailsofQMFMessageTypes"></a>Details of QMF Message Types</h3>

<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'>opcode</th>
<th class='confluenceTh'>message</th>
<th class='confluenceTh'>handled by</th>
<th class='confluenceTh'>description</th>
</tr>
<tr>
<td class='confluenceTd'>'B'</td>
<td class='confluenceTd'>Broker Request</td>
<td class='confluenceTd'>broker</td>
<td class='confluenceTd'>This message contains a broker request, sent from the management console to the broker to initiate a management session.</td>
</tr>
<tr>
<td class='confluenceTd'>'b'</td>
<td class='confluenceTd'>Broker Response</td>
<td class='confluenceTd'>console</td>
<td class='confluenceTd'>This message contains a broker response, sent from the broker in response to a broker request message.</td>
</tr>
<tr>
<td class='confluenceTd'>'z'</td>
<td class='confluenceTd'>Command Completion</td>
<td class='confluenceTd'>all</td>
<td class='confluenceTd'>This message is sent to indicate the completion of a request.</td>
</tr>
<tr>
<td class='confluenceTd'>'Q'</td>
<td class='confluenceTd'>Class Query</td>
<td class='confluenceTd'>broker, agent</td>
<td class='confluenceTd'>Class query messages are used by a management console to request a list of schema classes that are known by the management broker.</td>
</tr>
<tr>
<td class='confluenceTd'>'q'</td>
<td class='confluenceTd'>Class Indication</td>
<td class='confluenceTd'>console, broker</td>
<td class='confluenceTd'>Sent by the management broker, a class indication notifies the peer of the existence of a schema class.</td>
</tr>
<tr>
<td class='confluenceTd'>'S'</td>
<td class='confluenceTd'>Schema Request</td>
<td class='confluenceTd'>broker, agent</td>
<td class='confluenceTd'>Schema request messages are used to request the full schema details for a class.</td>
</tr>
<tr>
<td class='confluenceTd'>'s'</td>
<td class='confluenceTd'>Schema Response</td>
<td class='confluenceTd'>console, broker</td>
<td class='confluenceTd'>Schema response message contain a full description of the schema for a class.</td>
</tr>
<tr>
<td class='confluenceTd'>'h'</td>
<td class='confluenceTd'>Heartbeat Indication</td>
<td class='confluenceTd'>console</td>
<td class='confluenceTd'>This message is published once per publish-interval.  It can be used by a client to positively determine which objects did not change during the interval (since updates are not published for objects with no changes).</td>
</tr>
<tr>
<td class='confluenceTd'>'c', 'i', 'g'</td>
<td class='confluenceTd'>Content Indication</td>
<td class='confluenceTd'>console</td>
<td class='confluenceTd'>This message contains a content record.  Content records contain the values of all properties or statistics in an object.  Such records are broadcast on a periodic interval if 1) a change has been made in the value of one of the elements, or 2) if a new management client has bound a queue to the management exchange.</td>
</tr>
<tr>
<td class='confluenceTd'>'G'</td>
<td class='confluenceTd'>Get Query</td>
<td class='confluenceTd'>agent</td>
<td class='confluenceTd'>Sent by a management console, a get query requests that the management broker provide content indications for all objects that match the query criteria.</td>
</tr>
<tr>
<td class='confluenceTd'>'M'</td>
<td class='confluenceTd'>Method Request</td>
<td class='confluenceTd'>agent</td>
<td class='confluenceTd'>This message contains a method request.</td>
</tr>
<tr>
<td class='confluenceTd'>'m'</td>
<td class='confluenceTd'>Method Response</td>
<td class='confluenceTd'>console</td>
<td class='confluenceTd'>This message contains a method result.</td>
</tr>
<tr>
<td class='confluenceTd'>'P'</td>
<td class='confluenceTd'>Package Query</td>
<td class='confluenceTd'>broker, agent</td>
<td class='confluenceTd'>This message contains a schema package query request, requesting that the broker dump the list of known packages</td>
</tr>
<tr>
<td class='confluenceTd'>'p'</td>
<td class='confluenceTd'>Package Indication</td>
<td class='confluenceTd'>console, broker</td>
<td class='confluenceTd'>This message contains a schema package indication, identifying a package known by the broker</td>
</tr>
<tr>
<td class='confluenceTd'>'A'</td>
<td class='confluenceTd'>Agent Attach Request</td>
<td class='confluenceTd'>broker</td>
<td class='confluenceTd'>This message is sent by a remote agent when it wishes to attach to a management broker</td>
</tr>
<tr>
<td class='confluenceTd'>'a'</td>
<td class='confluenceTd'>Agent Attach Response</td>
<td class='confluenceTd'>agent</td>
<td class='confluenceTd'>The management broker sends this response if an attaching remote agent is permitted to join</td>
</tr>
<tr>
<td class='confluenceTd'>'x'</td>
<td class='confluenceTd'>Console Added Indication</td>
<td class='confluenceTd'>agent</td>
<td class='confluenceTd'>This message is sent to all remote agents by the management broker when a new console binds to the management exchange</td>
</tr>
</tbody></table>

<h4><a name="QMFProtocol-BrokerRequestMessage"></a>Broker Request Message</h4>

<p>When a management console first establishes contact with the broker, it sends a Broker Request message to initiate the exchange.</p>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'B' |           0           |
        +-----+-----+-----+-----+-----------------------+
</pre>
</div></div>

<p>The Broker Request message has no payload.</p>

<h4><a name="QMFProtocol-BrokerResponseMessage"></a>Broker Response Message</h4>

<p>When the broker receives a Broker Request message, it responds with a Broker Response message.  This message contains an identifier unique to the broker.</p>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'b' |           0           |
        +-----+-----+-----+-----+-----------------------+----------------------------+
        | brokerId (uuid)                                                            |
        +----------------------------------------------------------------------------+
</pre>
</div></div>

<h4><a name="QMFProtocol-CommandCompletionMessage"></a>Command Completion Message</h4>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'z' |          seq          |
        +-----+-----+-----+-----+----+------------------+
        |  Completion Code (uint32)  |
        +----------------------------+------------------------------------+
        |  Completion Text (str8)                                         |
        +-----------------------------------------------------------------+
</pre>
</div></div>

<h4><a name="QMFProtocol-ClassQuery"></a>Class Query</h4>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'Q' |          seq          |
        +-----+-----+-----+-----+-----------------------+----------+
        |  package name (str8)                                     |
        +----------------------------------------------------------+
</pre>
</div></div>

<h4><a name="QMFProtocol-ClassIndication"></a>Class Indication</h4>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'q' |          seq          |
        +-----+-----+-----+-----+---------------+-------+
        | class kind (uint8) 1=Object, 2=Event  |
        +---------------------------------------+------------------+
        | package name (str8)                                      |
        +----------------------------------------------------------+
        | class name (str8)                                        |
        +----------------------------------------------------------+
        | schema hash (bin128)                                     |
        +----------------------------------------------------------+
</pre>
</div></div>

<h4><a name="QMFProtocol-SchemaRequest"></a>Schema Request</h4>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'S' |          seq          |
        +-----+-----+-----+-----+-----------------------+----------+
        | packageName (str8)                                       |
        +----------------------------------------------------------+
        | className (str8)                                         |
        +----------------------------------------------------------+
        | schema-hash (bin128)                                     |
        +----------------------------------------------------------+
</pre>
</div></div>

<h4><a name="QMFProtocol-SchemaResponse"></a>Schema Response</h4>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 's' |          seq          |
        +-----+-----+-----+-----+------------+----------+
        | kind (uint8) 1=Object, 2=Event     |
        +------------------------------------+---------------------+
        | packageName (str8)                                       |
        +----------------------------------------------------------+
        | className (str8)                                         |
        +----------------------------------------------------------+
        | schema-hash (bin128)                                     |
        +-----------------------------------------------+----------+
        | propCount (uint16)                            |
        +-----------------------------------------------+
        | statCount (uint16)                            |
        +-----------------------------------------------+
        | methodCount (uint16)                          |
        +-----------------------------------------------+----------------------------+
        | propCount property records                                                 |
        +----------------------------------------------------------------------------+
        | statCount statistic records                                                |
        +----------------------------------------------------------------------------+
        | methodCount method records                                                 |
        +----------------------------------------------------------------------------+
</pre>
</div></div>

<p>Each <b>property</b> record is an AMQP map with the following fields.  Optional fields may optionally be omitted from the map.</p>

<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'>field name</th>
<th class='confluenceTh'>optional</th>
<th class='confluenceTh'>description</th>
</tr>
<tr>
<td class='confluenceTd'>name</td>
<td class='confluenceTd'>no</td>
<td class='confluenceTd'>Name of the property</td>
</tr>
<tr>
<td class='confluenceTd'>type</td>
<td class='confluenceTd'>no</td>
<td class='confluenceTd'>Type code for the property</td>
</tr>
<tr>
<td class='confluenceTd'>refPackage</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Name of referenced package (for objectReference and object types)</td>
</tr>
<tr>
<td class='confluenceTd'>refClass</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Name of referenced class (for objectReference and object types)</td>
</tr>
<tr>
<td class='confluenceTd'>access</td>
<td class='confluenceTd'>no</td>
<td class='confluenceTd'>Access code for the property</td>
</tr>
<tr>
<td class='confluenceTd'>index</td>
<td class='confluenceTd'>no</td>
<td class='confluenceTd'>1 = index element, 0 = not an index element</td>
</tr>
<tr>
<td class='confluenceTd'>optional</td>
<td class='confluenceTd'>no</td>
<td class='confluenceTd'>1 = optional element (may be not present), 0 = mandatory (always present)</td>
</tr>
<tr>
<td class='confluenceTd'>unit</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Units for numeric values (i.e. seconds, bytes, etc.)</td>
</tr>
<tr>
<td class='confluenceTd'>min</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Minimum value for numerics</td>
</tr>
<tr>
<td class='confluenceTd'>max</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Maximum value for numerics</td>
</tr>
<tr>
<td class='confluenceTd'>maxlen</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Maximum length for strings</td>
</tr>
<tr>
<td class='confluenceTd'>desc</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Description of the property</td>
</tr>
</tbody></table>

<p>Each <b>statistic</b> record is an AMQP map with the following fields:</p>

<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'>field name</th>
<th class='confluenceTh'>optional</th>
<th class='confluenceTh'>description</th>
</tr>
<tr>
<td class='confluenceTd'>name</td>
<td class='confluenceTd'>no</td>
<td class='confluenceTd'>Name of the statistic</td>
</tr>
<tr>
<td class='confluenceTd'>type</td>
<td class='confluenceTd'>no</td>
<td class='confluenceTd'>Type code for the statistic</td>
</tr>
<tr>
<td class='confluenceTd'>unit</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Units for numeric values (i.e. seconds, bytes, etc.)</td>
</tr>
<tr>
<td class='confluenceTd'>desc</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Description of the statistic</td>
</tr>
</tbody></table>

<p><b>method</b> records contain a main map that describes the method or header followed by zero or more maps describing arguments.  The main map contains the following fields:</p>

<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'>field name</th>
<th class='confluenceTh'>optional</th>
<th class='confluenceTh'>description</th>
</tr>
<tr>
<td class='confluenceTd'>name</td>
<td class='confluenceTd'>no</td>
<td class='confluenceTd'>Name of the method or event</td>
</tr>
<tr>
<td class='confluenceTd'>argCount</td>
<td class='confluenceTd'>no</td>
<td class='confluenceTd'>Number of argument records to follow</td>
</tr>
<tr>
<td class='confluenceTd'>desc</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Description of the method or event</td>
</tr>
</tbody></table>

<p>Argument maps contain the following fields:</p>

<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'>field name</th>
<th class='confluenceTh'>optional</th>
<th class='confluenceTh'>description</th>
</tr>
<tr>
<td class='confluenceTd'>name</td>
<td class='confluenceTd'>no</td>
<td class='confluenceTd'>Argument name</td>
</tr>
<tr>
<td class='confluenceTd'>type</td>
<td class='confluenceTd'>no</td>
<td class='confluenceTd'>Type code for the argument</td>
</tr>
<tr>
<td class='confluenceTd'>refPackage</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Name of referenced package (for objectReference and object types)</td>
</tr>
<tr>
<td class='confluenceTd'>refClass</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Name of referenced class (for objectReference and object types)</td>
</tr>
<tr>
<td class='confluenceTd'>dir</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Direction code for method arguments</td>
</tr>
<tr>
<td class='confluenceTd'>unit</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Units for numeric values (i.e. seconds, bytes, etc.)</td>
</tr>
<tr>
<td class='confluenceTd'>min</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Minimum value for numerics</td>
</tr>
<tr>
<td class='confluenceTd'>max</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Maximum value for numerics</td>
</tr>
<tr>
<td class='confluenceTd'>maxlen</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Maximum length for strings</td>
</tr>
<tr>
<td class='confluenceTd'>desc</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Description of the argument</td>
</tr>
<tr>
<td class='confluenceTd'>default</td>
<td class='confluenceTd'>yes</td>
<td class='confluenceTd'>Default value for the argument</td>
</tr>
</tbody></table>

<p><b>type codes</b> are numerics with the following values:</p>

<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'>value</th>
<th class='confluenceTh'>type</th>
<th class='confluenceTh'>Encoding</th>
</tr>
<tr>
<td class='confluenceTd'>1</td>
<td class='confluenceTd'>uint8</td>
<td class='confluenceTd'>uint8</td>
</tr>
<tr>
<td class='confluenceTd'>2</td>
<td class='confluenceTd'>uint16</td>
<td class='confluenceTd'>uint16</td>
</tr>
<tr>
<td class='confluenceTd'>3</td>
<td class='confluenceTd'>uint32</td>
<td class='confluenceTd'>uint32</td>
</tr>
<tr>
<td class='confluenceTd'>4</td>
<td class='confluenceTd'>uint64</td>
<td class='confluenceTd'>uint64</td>
</tr>
<tr>
<td class='confluenceTd'>6</td>
<td class='confluenceTd'>str8</td>
<td class='confluenceTd'>str8</td>
</tr>
<tr>
<td class='confluenceTd'>7</td>
<td class='confluenceTd'>str16</td>
<td class='confluenceTd'>str16</td>
</tr>
<tr>
<td class='confluenceTd'>8</td>
<td class='confluenceTd'>absTime</td>
<td class='confluenceTd'>uint64</td>
</tr>
<tr>
<td class='confluenceTd'>9</td>
<td class='confluenceTd'>deltaTime</td>
<td class='confluenceTd'>uint64</td>
</tr>
<tr>
<td class='confluenceTd'>10</td>
<td class='confluenceTd'>objectReference</td>
<td class='confluenceTd'>bin128</td>
</tr>
<tr>
<td class='confluenceTd'>11</td>
<td class='confluenceTd'>boolean</td>
<td class='confluenceTd'>boolean</td>
</tr>
<tr>
<td class='confluenceTd'>12</td>
<td class='confluenceTd'>float</td>
<td class='confluenceTd'>float</td>
</tr>
<tr>
<td class='confluenceTd'>13</td>
<td class='confluenceTd'>double</td>
<td class='confluenceTd'>double</td>
</tr>
<tr>
<td class='confluenceTd'>14</td>
<td class='confluenceTd'>uuid</td>
<td class='confluenceTd'>uuid</td>
</tr>
<tr>
<td class='confluenceTd'>15</td>
<td class='confluenceTd'>map</td>
<td class='confluenceTd'>map</td>
</tr>
<tr>
<td class='confluenceTd'>16</td>
<td class='confluenceTd'>int8</td>
<td class='confluenceTd'>int8</td>
</tr>
<tr>
<td class='confluenceTd'>17</td>
<td class='confluenceTd'>int16</td>
<td class='confluenceTd'>int16</td>
</tr>
<tr>
<td class='confluenceTd'>18</td>
<td class='confluenceTd'>int32</td>
<td class='confluenceTd'>int32</td>
</tr>
<tr>
<td class='confluenceTd'>19</td>
<td class='confluenceTd'>int64</td>
<td class='confluenceTd'>int64</td>
</tr>
<tr>
<td class='confluenceTd'>20</td>
<td class='confluenceTd'>object</td>
<td class='confluenceTd'>package-name(str8) + class-name(str8) + hash(bin128) + object-indication-encoding</td>
</tr>
<tr>
<td class='confluenceTd'>21</td>
<td class='confluenceTd'>list</td>
<td class='confluenceTd'>list</td>
</tr>
<tr>
<td class='confluenceTd'>22</td>
<td class='confluenceTd'>array</td>
<td class='confluenceTd'>array</td>
</tr>
</tbody></table>

<p><b>access codes</b> are numerics with the following values:</p>

<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'>value</th>
<th class='confluenceTh'>access</th>
</tr>
<tr>
<td class='confluenceTd'>1</td>
<td class='confluenceTd'>Read-Create access</td>
</tr>
<tr>
<td class='confluenceTd'>2</td>
<td class='confluenceTd'>Read-Write access</td>
</tr>
<tr>
<td class='confluenceTd'>3</td>
<td class='confluenceTd'>Read-Only access</td>
</tr>
</tbody></table>

<p><b>direction codes</b> are strings with the following values:</p>

<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'>value</th>
<th class='confluenceTh'>direction</th>
</tr>
<tr>
<td class='confluenceTd'>"I"</td>
<td class='confluenceTd'>Input (from client to broker)</td>
</tr>
<tr>
<td class='confluenceTd'>"O"</td>
<td class='confluenceTd'>Output (from broker to client)</td>
</tr>
<tr>
<td class='confluenceTd'>"IO"</td>
<td class='confluenceTd'>IO (bidirectional)</td>
</tr>
</tbody></table>


<h4><a name="QMFProtocol-HeartbeatIndication"></a>Heartbeat Indication</h4>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'h' |           0           |
        +-----+-----+-----+-----+-----------------------+
        | timestamp of current interval (datetime)      |
        +-----------------------------------------------+
</pre>
</div></div>


<h4><a name="QMFProtocol-ConfigurationandInstrumentationContentMessages"></a>Configuration and Instrumentation Content Messages</h4>

<p>Content messages are published when changes are made to the values of properties or statistics or when new management clients bind a queue to the management exchange.</p>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-------+-----------------------+
        | 'A' | 'M' | '2' |'g/c/i'|          seq          |
        +-----+-----+-----+-------+-----------------------+--------+
        |                packageName (str8)                        |
        +----------------------------------------------------------+
        |                className (str8)                          |
        +----------------------------------------------------------+
        |                class hash (bin128)                       |
        +-----+-----+-----+-----+-----+-----+-----+-----+----------+
        | timestamp of current sample (datetime)        |
        +-----+-----+-----+-----+-----+-----+-----+-----+
        | time object was created (datetime)            |
        +-----+-----+-----+-----+-----+-----+-----+-----+
        | time object was deleted (datetime)            |
        +-----+-----+-----+-----+-----+-----+-----+-----+
        | objectId (bin128)                             |
        +-----+-----+-----+-----+-----+-----+-----+-----+
        | presence bitmasks (0 or more uint8 fields)    |
        +-----+-----+-----+-----+-----+-----+-----+-----+------------------------+
        | config/inst values (in schema order)                                   |
        +------------------------------------------------------------------------+
</pre>
</div></div>

<p>All timestamps are uint64 values representing nanoseconds since the epoch (January 1, 1970).  The objectId is a bin128 value that uniquely identifies this object instance.</p>

<p>If any of the properties in the object are defined as optional, there will be 1 or more "presence bitmask" octets.  There are as many octets as are needed to provide one bit per optional property.  The bits are assigned to the optional properties in schema order (first octet first, lowest order bit first).</p>

<p>For example:  If there are two optional properties in the schema called "option1" and "option2" (defined in that order), there will be one presence bitmask octet and the bits will be assigned as bit 0 controls option1 and bit 1 controls option2.</p>

<p>If the bit for a particular optional property is set (1), the property will be encoded normally in the "values" portion of the message.  If the bit is clear (0), the property will be omitted from the list of encoded values and will be considered "NULL" or "not present".</p>

<p>The element values are encoded by their type into the message in the order in which they appeared in the schema message.</p>

<h4><a name="QMFProtocol-GetQueryMessage"></a>Get Query Message</h4>

<p>A Get Request may be sent by the management console to cause a management agent to immediately send content information for objects of a class.</p>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'G' |          seq          |
        +-----+-----+-----+-----+-----------------------+----------+
        | Get request field table (map)                            |
        +----------------------------------------------------------+
</pre>
</div></div>

<p>The content of a get request is a field table that specifies what objects are being requested.  Most of the fields are optional and are available for use in more extensive deployments.</p>

<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'>Field Key</th>
<th class='confluenceTh'>Type</th>
<th class='confluenceTh'>Description</th>
</tr>
<tr>
<td class='confluenceTd'>"_class"</td>
<td class='confluenceTd'>str8</td>
<td class='confluenceTd'>The name of the class of objects being requested.</td>
</tr>
<tr>
<td class='confluenceTd'>"_package"</td>
<td class='confluenceTd'>str8</td>
<td class='confluenceTd'>The name of the extension package the class belongs to.  If omitted, the package defaults to "qpid" for access to objects in the connected broker.</td>
</tr>
<tr>
<td class='confluenceTd'>_objectid</td>
<td class='confluenceTd'>bin128</td>
<td class='confluenceTd'>The object ID of the object being requested</td>
</tr>
</tbody></table>

<p>When the management agent receives a get request, it sends content messages describing the requested objects.  Once the last content message is sent, it then sends a Command Completion message with the same sequence number supplied in the request to indicate to the requestor that there are no more messages coming.</p>


<h4><a name="QMFProtocol-MethodRequest"></a>Method Request</h4>

<p>Method request messages have the following structure.  The sequence number is opaque to the management agent.  It is returned unchanged in the method reply so the calling client can correctly associate the reply to the request.  The objectId is the unique ID of the object on which the method is to be executed.</p>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'M' |          seq          |
        +-----+-----+-----+-----+-----------------------+
        |  objectId (bin128)                            |
        +-----------------------------------------------+
        |  package name (str8)                          |
        +-----------------------------------------------+
        |  class name (str8)                            |
        +-----------------------------------------------+
        |  class hash (bin128)                          |
        +-----------------------------------------------+
        |  methodName (str8)                            |
        +-----------------------------------------------+------------------------+
        |  input and bidirectional argument values (in schema order)             |
        +------------------------------------------------------------------------+
</pre>
</div></div>

<h4><a name="QMFProtocol-MethodResponse"></a>Method Response</h4>

<p>Method reply messages have the following structure.  The sequence number is identical to that supplied in the method request.  The status code (and text) indicate whether or not the method was successful and if not, what the error was.  Output and bidirectional arguments are only included if the status code was 0 (STATUS_OK).</p>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'm' |          seq          |
        +-----+-----+-----+-----+-----------------------+
        |  status code (uint32) |
        +-----------------------+----------------------------------+
        |  status text (str16)                                     |
        +-----------------------+----------------------------------+-------------+
        |  output and bidirectional argument values (in schema order)            |
        +------------------------------------------------------------------------+
</pre>
</div></div>

<p><b>status code</b> values are:</p>

<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'>value</th>
<th class='confluenceTh'>description</th>
</tr>
<tr>
<td class='confluenceTd'>0</td>
<td class='confluenceTd'> STATUS_OK - successful completion</td>
</tr>
<tr>
<td class='confluenceTd'>1</td>
<td class='confluenceTd'> STATUS_UNKNOWN_OBJECT - objectId not found in the agent</td>
</tr>
<tr>
<td class='confluenceTd'>2</td>
<td class='confluenceTd'> STATUS_UNKNOWN_METHOD - method is not known by the object type</td>
</tr>
<tr>
<td class='confluenceTd'>3</td>
<td class='confluenceTd'> STATUS_NOT_IMPLEMENTED - method is not currently implemented</td>
</tr>
<tr>
<td class='confluenceTd'>4</td>
<td class='confluenceTd'> STATUS_INVALID_PARAMETER - input argument is invalid</td>
</tr>
<tr>
<td class='confluenceTd'>5</td>
<td class='confluenceTd'> STATUS_FEATURE_NOT_IMPLEMENTED</td>
</tr>
<tr>
<td class='confluenceTd'>6</td>
<td class='confluenceTd'> STATUS_FORBIDDEN - operation is forbidden by Access Control List</td>
</tr>
<tr>
<td class='confluenceTd'>7</td>
<td class='confluenceTd'> STATUS_EXCEPTION - exception caught during method execution</td>
</tr>
</tbody></table>


<h3><a name="QMFProtocol-MessagesforExtendedScenario"></a>Messages for Extended Scenario</h3>

<h4><a name="QMFProtocol-ExtendedManagementProtocol"></a>Extended Management Protocol</h4>

<p>Qpid supports management extensions that allow the management broker to be a central point for the management of multiple external entities with their own management schemas.</p>

<div class="preformatted"><div class="preformattedContent">
<pre>      Broker                                                       Remote Agent
        |                                                               |
        | &lt;----------------------------------------- Attach Request --- |
        | --- Attach Response ----------------------------------------&gt; |
        |                                                               |
        | &lt;------------------------------------- Package Indication --- |
        | &lt;------------------------------------- Package Indication --- |
        |                                                               |
        | &lt;--------------------------------------- Class Indication --- |
        | &lt;--------------------------------------- Class Indication --- |
        | &lt;--------------------------------------- Class Indication --- |
        | &lt;--------------------------------------- Class Indication --- |
        | &lt;--------------------------------------- Class Indication --- |
        |                                                               |
        | --- Schema Request (class key) -----------------------------&gt; |
        | &lt;---------------------------------------- Schema Response --- |
        |                                                               |
        | --- Schema Request (class key) -----------------------------&gt; |
        | &lt;---------------------------------------- Schema Response --- |
        |                                                               |
        |                                                               |
</pre>
</div></div>



<h4><a name="QMFProtocol-PackageQuery"></a>Package Query</h4>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'P' |          seq          |
        +-----+-----+-----+-----+-----------------------+
</pre>
</div></div>

<h4><a name="QMFProtocol-PackageIndication"></a>Package Indication</h4>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'p' |          seq          |
        +-----+-----+-----+-----+-----------------------+----------+
        |  package name (str8)                                     |
        +----------------------------------------------------------+
</pre>
</div></div>

<h4><a name="QMFProtocol-AgentAttachRequest"></a>Agent Attach Request</h4>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'A' |          seq          |
        +-----+-----+-----+-----+-----------------------+----------+
        |  label (str8)                                            |
        +----------------------------------------------------------+
        |  system-id (uuid)                                        |
        +---------------------------------+------------------------+
        |  requested broker bank (uint32) |
        +---------------------------------+
        |  requested agent bank (uint32)  |
        +---------------------------------+
</pre>
</div></div>


<h4><a name="QMFProtocol-AgentAttachResponse%28success%29"></a>Agent Attach Response (success)</h4>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'a' |          seq          |
        +-----+-----+-----+-----+--------+--------------+
        |  assigned broker bank (uint32) |
        +--------------------------------+
        |  assigned agent bank (uint32)  |
        +--------------------------------+
</pre>
</div></div>

<h4><a name="QMFProtocol-ConsoleAddedIndication"></a>Console Added Indication</h4>

<div class="preformatted"><div class="preformattedContent">
<pre>        +-----+-----+-----+-----+-----------------------+
        | 'A' | 'M' | '2' | 'x' |          seq          |
        +-----+-----+-----+-----+-----------------------+
</pre>
</div></div></div>


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