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From "Gregor Zurowski (Confluence)" <conflue...@apache.org>
Subject [CONF] Apache Camel > File2
Date Fri, 04 Apr 2014 02:14:00 GMT
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border="0" width="100%">
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style="font-size: 13px; text-align: left; vertical-align: top; width: 48px; padding-right:
8px"> <img class="avatar" src="cid:avatar_95e9fa34c9f9fa25ca8d9a869542797e" border="0"
height="48" width="48" style="-ms-interpolation-mode: bicubic; border-radius: 3px" /> </td>
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13px">
                                                        <div id="email-title-flavor" class="email-metadata"
style="margin: 0; padding: 0 0 4px 0; color: #505050">
                                                            <a href="    https://cwiki.apache.org/confluence/display/~gzurowski
" style="color:#326ca6;text-decoration:none;; color: #326ca6; text-decoration: none">Gregor
Zurowski</a> edited the page:
                                                        </div> </td>
                                                </tr>
                                                <tr>
                                                    <td valign="top" style="font-size:
13px"> <h2 id="email-title-heading" style="font-size: 16px; line-height: 20px; min-height:
20px; margin: 0; padding: 0"> <a href="https://cwiki.apache.org/confluence/display/CAMEL/File2"
style="color: #326ca6; text-decoration: none"> <img class="icon" src="cid:page-icon"
alt="" style="border: 0; padding: 0 5px 0 0; text-align: left; vertical-align: middle" />
<strong style="font-size:16px;line-height:20px;vertical-align:top;">File2</strong>
</a> </h2> </td>
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16px 0">
                                            <p class="aui-message info" style="font-size:
13px; margin: 1em 0; padding: 8px; background-color: #e0f0ff; border: 1px solid #9eb6d4">
<b>Comment:</b> Add description of renameUsingCopy parameter </p>
                                            <div class="email-diff">
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style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;;
font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color:
;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/images/icons/macrobrowser/macro-placeholder-default.png"
style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Wiki Markup</th>
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<pre style="font-size: 13px">{div:class=confluenceTableSmall}
|| Name || Default Value || Description ||
| {{autoCreate}} | {{true}} | Automatically create missing directories in the file's pathname.
For the file consumer, that means creating the starting directory. For the file producer,
it means the directory the files should be written to. |
| {{bufferSize}} | 128kb | Write buffer sized in bytes. |
| {{fileName}} | {{null}} | Use [Expression] such as [File Language] to dynamically set the
filename. For consumers, it's used as a filename filter. For producers, it's used to evaluate
the filename to write. If an expression is set, it take precedence over the {{CamelFileName}}
header. (*Note:* The header itself can also be an [Expression]). The expression options support
both {{String}} and {{Expression}} types. If the expression is a {{String}} type, it is *always*
evaluated using the [File Language]. If the expression is an {{Expression}} type, the specified
{{Expression}} type is used - this allows you, for instance, to use [OGNL] expressions. For
the consumer, you can use it to filter filenames, so you can for instance consume today's
file using the [File Language] syntax: {{mydata-$\{date:now:yyyyMMdd}.txt}}. From *Camel 2.11*
onwards the producers support the {{CamelOverruleFileName}} header which takes precedence
over any existing {{CamelFileName}} header; the {{CamelOverruleFileName}} is a header that
is used only once, and makes it easier as this avoids to temporary store {{CamelFileName}}
and have to restore it afterwards. |
| {{flatten}} | {{false}} | Flatten is used to flatten the file name path to strip any leading
paths, so it's just the file name. This allows you to consume recursively into sub-directories,
but when you eg write the files to another directory they will be written in a single directory.
Setting this to {{true}} on the producer enforces that any file name recived in {{CamelFileName}}
header will be stripped for any leading paths. |
| {{charset}} | {{null}} | *Camel 2.9.3:* this option is used to specify the encoding of the
file, and camel will set the Exchange property with {{Exchange.CHARSET_NAME}} with the value
of this option. You can use this on the consumer, to specify the encodings of the files, which
allow Camel to know the charset it should load the file content in case the file content is
being accessed. Likewise when writing a file, you can use this option to specify which charset
to write the file as well. See further below for a examples and more important details. |
| {{copyAndDeleteOnRenameFail}} | {{true}} | *Camel 2.9*: whether to fallback and do a copy
and delete file, in case the file could not be renamed directly. This option is not available
for the [FTP|FTP2] component. |
<span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color:
#ddfade;">| </span>{<span class="diff-html-added" id="added-diff-1" style="font-size:
100%; background-color: #ddfade;">{renameUsingCopy}} | {{false}} | *Camel 2.13.1*: Perform
rename operations using a copy and delete strategy. This is primarily used in environments
where the regular rename operation is unreliable (e.g. across different file systems or networks).
This option takes precedence over the {{copyAndDeleteOnRenameFail}} parameter that will automatically
fall back to the copy and delete strategy, but only after additional delays.
{</span>div}</pre> </td>
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                                                    <h4 id="File2-Consumer" class="diff-block-context">Consumer</h4>
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style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px
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style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;;
font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color:
;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/images/icons/macrobrowser/macro-placeholder-default.png"
style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Wiki Markup</th>
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style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px">
<pre style="font-size: 13px">{div:class=confluenceTableSmall}
|| Name || Default Value || Description ||
| {{initialDelay}} | {{1000}} | Milliseconds before polling the file/directory starts. |
| {{delay}} | {{500}} | Milliseconds before the next poll of the file/directory. |
| {{useFixedDelay}} | | Controls if fixed delay or fixed rate is used. See [ScheduledExecutorService|http://java.sun.com/j2se/1.5.0/docs/api/java/util/concurrent/ScheduledExecutorService.html]
in JDK for details. In *Camel 2.7.x* or older the default value is {{false}}. From *Camel
2.8* onwards the default value is {{true}}. |
| {{runLoggingLevel}} | {{TRACE}} | *Camel 2.8:* The consumer logs a start/complete log line
when it polls. This option allows you to configure the logging level for that. |
| {{recursive}} | {{false}} | If a directory, will look for files in all the sub-directories
as well. |
| {{delete}} | {{false}} | If {{true}}, the file will be deleted *after* it is processed |
| {{noop}} | {{false}} | If {{true}}, the file is not moved or deleted in any way. This option
is good for readonly data, or for [ETL] type requirements. If {{noop=true}}, Camel will set
{{idempotent=true}} as well, to avoid consuming the same files over and over again. |
| {{preMove}} | {{null}} | [Expression] (such as [File Language]) used to dynamically set
the filename when moving it *before* processing. For example to move in-progress files into
the {{order}} directory set this value to {{order}}. |
| {{move}} | {{.camel}} | [Expression] (such as [File Language]) used to dynamically set the
filename when moving it *after* processing. To move files into a {{.done}} subdirectory just
enter {{.done}}. |
| {{moveFailed}} | {{null}} | [Expression] (such as [File Language]) used to dynamically set
a different target directory when moving files after processing (configured via {{move}} defined
above) failed. For example, to move files into a {{.error}} subdirectory use: {{.error}}.
Note: When moving the files to the “fail” location Camel will *handle* the error and will
not pick up the file again. |
| {{include}} | {{null}} | Is used to include files, if filename matches the regex pattern.
|
| {{exclude}} | {{null}} | Is used to exclude files, if filename matches the regex pattern.
|
| {{antInclude}} | {{null}} | *Camel 2.10:* Ant style filter inclusion, for example {{antInclude=\*}}{{{}*/*{}}}{{.txt}}.
Multiple inclusions may be specified in comma-delimited format. See [below|#Filtering using
ANT path matcher] for more details about ant path filters. |
| {{antExclude}} | {{null}} | *Camel 2.10:* Ant style filter exclusion. If both {{antInclude}}
and {{antExclude}} are used, {{antExclude}} takes precedence over {{antInclude}}. Multiple
exclusions may be specified in comma-delimited format. See [below|#Filtering using ANT path
matcher] for more details about ant path filters. |
| {{antFilterCaseSensitive}} | {{true}} | *Camel 2.11:* Ant style filter which is case sensitive
or not. |
| {{idempotent}} | {{false}} | Option to use the [Idempotent Consumer] EIP pattern to let
Camel skip already processed files. Will by default use a memory based LRUCache that holds
1000 entries. If {{noop=true}} then idempotent will be enabled as well to avoid consuming
the same files over and over again. |
| {{idempotentKey}} | {{Expression}} | *Camel 2.11:* To use a custom idempotent key. By default
the absolute path of the file is used. You can use the [File Language], for example to use
the file name and file size, you can do: {code}idempotentKey=${file:name}-${file:size}{code}.
|
| {{idempotentRepository}} | {{null}} | A pluggable repository [org.apache.camel.spi.IdempotentRepository|http://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/spi/IdempotentRepository.html]
which by default use {{MemoryMessageIdRepository}} if none is specified and {{idempotent}}
is {{true}}. |
| {{inProgressRepository}} | {{memory}} | A pluggable in-progress repository [org.apache.camel.spi.IdempotentRepository|http://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/spi/IdempotentRepository.html].
The in-progress repository is used to account the current in progress files being consumed.
By default a memory based repository is used. |
| {{filter}} | {{null}} | Pluggable filter as a {{org.apache.camel.component.file.GenericFileFilter}}
class. Will skip files if filter returns {{false}} in its {{accept()}} method. More details
in section below. |
| {{sorter}} | {{null}} | Pluggable sorter as a [java.util.Comparator&lt;org.apache.camel.component.file.GenericFile&gt;|http://java.sun.com/j2se/1.5.0/docs/api/java/util/Comparator.html]
class. |
| {{sortBy}} | {{null}} | Built-in sort using the [File Language]. Supports nested sorts,
so you can have a sort by file name and as a 2nd group sort by modified date. See sorting
section below for details. |
| {{readLock}} | {{markerFile}} | Used by consumer, to only poll the files if it has exclusive
read-lock on the file (i.e. the file is not in-progress or being written). Camel will wait
until the file lock is granted. \\
This option provides the build in strategies: \\  {{markerFile}} Camel creates a marker file
(fileName.camelLock) and then holds a lock on it. This option is *not* available for the [FTP|FTP2]
component. \\  {{changed}} is using file length/modification timestamp to detect whether the
file is currently being copied or not. Will at least use 1 sec. to determine this, so this
option cannot consume files as fast as the others, but can be more reliable as the JDK IO
API cannot always determine whether a file is currently being used by another process. The
option {{readLockCheckInterval}} can be used to set the check frequency. This option is *only*
avail for the [FTP|FTP2] component from *Camel 2.8* onwards. Notice that from *Camel 2.10.1*
onwards the [FTP|FTP2] option {{fastExistsCheck}} can be enabled to speedup this readLock
strategy, if the FTP server support the LIST operation with a full file name (some servers
may not). \\  {{fileLock}} is for using {{java.nio.channels.FileLock}}. This option is *not*
avail for the [FTP|FTP2] component. This approach should be avoided when accessing a remote
file system via a mount/share unless that file system supports distributed file locks. \\
 {{rename}} is for using a try to rename the file as a test if we can get exclusive read-lock.
\\  {{none}} is for no read locks at all. \\
Notice from *Camel 2.10* onwards the read locks {{changed}}, {{fileLock}} and {{rename}} will
also use a {{markerFile}} as well, to ensure not picking up files that may be in process by
another Camel consumer running on another node (eg cluster). This is only supported by the
file component (not the ftp component). |
| {{readLockTimeout}} | {{10000}} | Optional timeout in millis for the read-lock, if supported
by the read-lock. If the read-lock could not be granted and the timeout triggered, then Camel
will skip the file. At next poll Camel, will try the file again, and this time maybe the read-lock
could be granted. Use a value of 0 or lower to indicate forever. In *Camel 2.0* the default
value is 0. Starting with *Camel 2.1* the default value is 10000. Currently {{fileLock}},
{{changed}} and {{rename}} support the timeout. *Notice:* For [FTP|FTP2] the default {{readLockTimeout}}
value is {{20000}} instead of {{10000}}. |
| {{readLockCheckInterval}} | {{1000}} | *Camel 2.6:* Interval in millis for the read-lock,
if supported by the read lock. This interval is used for sleeping between attempts to acquire
the read lock. For example when using the {{changed}} read lock, you can set a higher interval
period to cater for _slow writes_. The default of 1 sec. may be _too fast_ if the producer
is very slow writing the file. For [FTP|FTP2] the default {{readLockCheckInterval}} is {{5000}}.
|
| {{readLockMinLength}} | {{1}} | *Camel 2.10.1:* This option applied only for {{readLock=changed}}.
This option allows you to configure a minimum file length. By default Camel expects the file
to contain data, and thus the default value is 1. You can set this option to zero, to allow
consuming zero-length files. |
| {{readLockLoggingLevel}} | {{WARN}} | *Camel 2.12:* Logging level used when a read lock
could not be acquired. By default a WARN is logged. You can change this level, for example
to OFF to not have any logging. This option is only applicable for readLock of types: changed,
fileLock, rename. |
| {{directoryMustExist}} | {{false}} | *Camel 2.5:* Similar to {{startingDirectoryMustExist}}
but this applies during polling recursive sub directories. |
| {{doneFileName}} | {{null}} | *Camel 2.6:* If provided, Camel will only consume files if
a _done_ file exists. This option configures what file name to use. Either you can specify
a fixed name. Or you can use dynamic placeholders. The _done_ file is *always* expected in
the same folder as the original file. See _using done file_ and _writing done file_ sections
for examples. |
| {{exclusiveReadLockStrategy}} | {{null}} | Pluggable read-lock as a {{org.apache.camel.component.file.GenericFileExclusiveReadLockStrategy}}
implementation. |
| {{maxMessagesPerPoll}} | {{0}} | An integer to define a maximum messages to gather per poll.
By default no maximum is set. Can be used to set a limit of e.g. 1000 to avoid when starting
up the server that there are thousands of files. Set a value of 0 or negative to disabled
it. See more details at [Batch Consumer]. *Notice:* If this option is in use then the [File|File2]
and [FTP|FTP2] components will limit *before* any sorting. For example if you have 100000
files and use {{maxMessagesPerPoll=500}}, then only the first 500 files will be picked up,
and then sorted. You can use the {{eagerMaxMessagesPerPoll}} option and set this to {{false}}
to allow to scan all files first and then sort afterwards. |
| {{eagerMaxMessagesPerPoll}} | {{true}} | *Camel 2.9.3:* Allows for controlling whether the
limit from {{maxMessagesPerPoll}} is eager or not. If eager then the limit is during the scanning
of files. Where as {{false}} would scan all files, and then perform sorting. Setting this
option to {{false}} allows for sorting all files first, and then limit the poll. Mind that
this requires a higher memory usage as all file details are in memory to perform the sorting.
|
| {{minDepth}} | 0 | *Camel 2.8*: The minimum depth to start processing when recursively processing
a directory. Using {{minDepth=1}} means the base directory. Using {{minDepth=2}} means the
first sub directory. This option is supported by [FTP|FTP2] consumer from *Camel 2.8.2, 2.9*
onwards. |
| {{maxDepth}} | {{Integer.MAX_VALUE}} | *Camel 2.8:* The maximum depth to traverse when recursively
processing a directory. This option is supported by [FTP|FTP2] consumer from *Camel 2.8.2,
2.9* onwards. |
| {{processStrategy}} | {{null}} | A pluggable {{org.apache.camel.component.file.GenericFileProcessStrategy}}
allowing you to implement your own {{readLock}} option or similar. Can also be used when special
conditions must be met before a file can be consumed, such as a special _ready_ file exists.
If this option is set then the {{readLock}} option does not apply. |
| {{startingDirectoryMustExist}} | {{false}} | *Camel 2.5:* Whether the starting directory
must exist. Mind that the {{autoCreate}} option is default enabled, which means the starting
directory is normally auto created if it doesn't exist. You can disable {{autoCreate}} and
enable this to ensure the starting directory must exist. Will thrown an exception if the directory
doesn't exist. |
| {{pollStrategy}} | {{null}} | A pluggable {{org.apache.camel.spi.PollingConsumerPollStrategy}}
allowing you to provide your custom implementation to control error handling usually occurred
during the {{poll}} operation *before* an [Exchange] have been created and being routed in
Camel. In other words the error occurred while the polling was gathering information, for
instance access to a file network failed so Camel cannot access it to scan for files. The
default implementation will log the caused exception at {{WARN}} level and ignore it. |
| {{sendEmptyMessageWhenIdle}} | {{false}} | *Camel 2.9:* If the polling consumer did not
poll any files, you can enable this option to send an empty message (no body) instead. |
| {{consumer.bridgeErrorHandler}} | {{false}} | *Camel 2.10:* Allows for bridging the consumer
to the Camel routing [Error Handler], which mean any exceptions occurred while trying to pickup
files, or the likes, will now be processed as a message and handled by the routing [Error
Handler]. By default the consumer will use the {{org.apache.camel.spi.ExceptionHandler}} to
deal with exceptions, that by default will be logged at WARN/ERROR level and ignored. See
further below on this page fore more details, at section _How to use the Camel error handler
to deal with exceptions triggered outside the routing engine_. |
| {{scheduledExecutorService}} | {{null}} | *Camel 2.10:* Allows for configuring a custom/shared
thread pool to use for the consumer. By default each consumer has its own single threaded
thread pool. This option allows you to share a thread pool among multiple file consumers.
|
| {{scheduler}} | {{null}} | *Camel 2.12:* To use a custom scheduler to trigger the consumer
to run. See more details at [Polling Consumer], for example there is a [Quartz2], and [Spring]
based scheduler that supports CRON expressions. |
| {{backoffMultiplier}} | {{0}} | *Camel 2.12:* To let the scheduled polling consumer backoff
if there has been a number of subsequent idles/errors in a row. The multiplier is then the
number of polls that will be skipped before the next actual attempt is happening again. When
this option is in use then {{backoffIdleThreshold}} and/or {{backoffErrorThreshold}} must
also be configured. See more details at [Polling Consumer]. |
| {{backoffIdleThreshold}} | {{0}} | *Camel 2.12:* The number of subsequent idle polls that
should happen before the {{backoffMultipler}} should kick-in. |
| {{backoffErrorThreshold}} | {{0}} | *Camel 2.12:* The number of subsequent error polls (failed
due some error) that should happen before the {{backoffMultipler}} should kick-in. |
{div}</pre> </td>
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<pre style="font-size: 13px">{div:class=confluenceTableSmall}
|| Name || Default Value || Description ||
| {{fileExist}} | {{Override}} | What to do if a file already exists with the same name. The
following values can be specified: *Override*, *Append*, *Fail*, *Ignore*, *Move*, and *TryRename*
(Camel 2.11.1). {{Override}}, which is the default, replaces the existing file. {{Append}}
adds content to the existing file. {{Fail}} throws a {{GenericFileOperationException}}, indicating
that there is already an existing file. {{Ignore}} silently ignores the problem and *does
not* override the existing file, but assumes everything is okay. The {{Move}} option requires
*Camel 2.10.1* onwards, and the corresponding {{moveExisting}} option to be configured as
well. The option {{eagerDeleteTargetFile}} can be used to control what to do if an moving
the file, and there exists already an existing file, otherwise causing the move operation
to fail. The {{Move}} option will move any existing files, before writing the target file.
{{TryRename}} *Camel 2.11.1* is only applicable if {{tempFileName}} option is in use. This
allows to try renaming the file from the temporary name to the actual name, without doing
any exists check. This check may be faster on some file systems and especially FTP servers.
|
| {{tempPrefix}} | {{null}} | This option is used to write the file using a temporary name
and then, after the write is complete, rename it to the real name. Can be used to identify
files being written and also avoid consumers (not using exclusive read locks) reading in progress
files. Is often used by [FTP|FTP2] when uploading big files. |
| {{tempFileName}} | {{null}} | *Camel 2.1:* The *same* as {{tempPrefix}} option but offering
a more fine grained control on the naming of the temporary filename as it uses the [File Language].
|
| {{moveExisting}} | {{null}} | *Camel 2.10.1:* [Expression] (such as [File Language]) used
to compute file name to use when {{fileExist=Move}} is configured. To move files into a {{backup}}
subdirectory just enter {{backup}}. This option only supports the following [File Language]
tokens: &quot;file:name&quot;, &quot;file:name.ext&quot;, &quot;file:name.noext&quot;,
&quot;file:onlyname&quot;, &quot;file:onlyname.noext&quot;, &quot;file:ext&quot;,
and &quot;file:parent&quot;. Notice the &quot;file:parent&quot; is not supported
by the [FTP|FTP2] component, as the FTP component can only move any existing files to a relative
directory based on current dir as base. |
| {{keepLastModified}} | {{false}} | *Camel 2.2:* Will keep the last modified timestamp from
the source file (if any). Will use the {{Exchange.FILE_LAST_MODIFIED}} header to located the
timestamp. This header can contain either a {{java.util.Date}} or {{long}} with the timestamp.
If the timestamp exists and the option is enabled it will set this timestamp on the written
file. *Note:* This option only applies to the *file* producer. You _cannot_ use this option
with any of the ftp producers. |
| {{eagerDeleteTargetFile}} | {{true}} | *Camel 2.3:* Whether or not to eagerly delete any
existing target file. This option only applies when you use {{fileExists=Override}} and the
{{tempFileName}} option as well. You can use this to disable (set it to false) deleting the
target file before the temp file is written. For example you may write big files and want
the target file to exists during the temp file is being written. This ensure the target file
is only deleted until the very last moment, just before the temp file is being renamed to
the target filename. From *Camel 2.10.1* onwards this option is also used to control whether
to delete any existing files when {{fileExist=Move}} is enabled, and an existing file exists.
If this option <span class="diff-html-removed" id="removed-diff-0" style="font-size: 100%;
background-color: #ffe7e7; text-decoration: line-through;">is</span><span class="diff-html-added"
id="added-diff-2" style="font-size: 100%; background-color: #ddfade;">copyAndDeleteOnRenameFailis</span>
false, then an exception will be thrown if an existing file existed, if its true, then the
existing file is deleted before the move operation. |
| {{doneFileName}} | {{null}} | *Camel 2.6:* If provided, then Camel will write a 2nd _done_
file when the original file has been written. The _done_ file will be empty. This option configures
what file name to use. Either you can specify a fixed name. Or you can use dynamic placeholders.
The _done_ file will *always* be written in the same folder as the original file. See _writing
done file_ section for examples. |
| {{allowNullBody}} | {{false}} | *Camel 2.10.1:* Used to specify if a null body is allowed
during file writing. If set to true then an empty file will be created, when set to false,
and attempting to send a null body to the file component, a GenericFileWriteException of 'Cannot
write null body to file.' will be thrown. If the `fileExist` option is set to 'Override',
then the file will be truncated, and if set to `append` the file will remain unchanged. |
| {{forceWrites}} | {{true}} | *Camel 2.10.5/2.11:* Whether to force syncing writes to the
file system. You can turn this off if you do not want this level of guarantee, for example
if writing to logs / audit logs etc; this would yield better performance. |
{div}</pre> </td>
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