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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CURATOR-33) Recursive Node Cache
Date Thu, 31 Jul 2014 23:08:38 GMT

    [ https://issues.apache.org/jira/browse/CURATOR-33?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14081652#comment-14081652
] 

ASF GitHub Bot commented on CURATOR-33:
---------------------------------------

Github user dragonsinth commented on a diff in the pull request:

    https://github.com/apache/curator/pull/17#discussion_r15675713
  
    --- Diff: curator-recipes/src/main/java/org/apache/curator/framework/recipes/cache/TreeCacheEvent.java
---
    @@ -0,0 +1,126 @@
    +/**
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *   http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing,
    + * software distributed under the License is distributed on an
    + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    + * KIND, either express or implied.  See the License for the
    + * specific language governing permissions and limitations
    + * under the License.
    + */
    +
    +package org.apache.curator.framework.recipes.cache;
    +
    +/**
    + * POJO that abstracts a change to a path
    + */
    +public class TreeCacheEvent
    +{
    +    private final Type type;
    +    private final ChildData data;
    +
    +    /**
    +     * Type of change
    +     */
    +    public enum Type
    +    {
    +        /**
    +         * A node was added.
    +         */
    +        NODE_ADDED,
    +
    +        /**
    +         * A node's data was changed
    +         */
    +        NODE_UPDATED,
    +
    +        /**
    +         * A node was removed from the tree
    +         */
    +        NODE_REMOVED,
    +
    +        /**
    +         * Called when the connection has changed to {@link org.apache.curator.framework.state.ConnectionState#SUSPENDED}
    +         * <p/>
    +         * This is exposed so that users of the class can be notified of issues that
*might* affect normal operation.
    +         * The TreeCache is written such that listeners are not expected to do anything
special on this
    +         * event, except for those people who want to cause some application-specific
logic to fire when this occurs.
    +         * While the connection is down, the TreeCache will continue to have its state
from before it lost
    +         * the connection and after the connection is restored, the TreeCache will emit
normal child events
    +         * for all of the adds, deletes and updates that happened during the time that
it was disconnected.
    +         */
    +        CONNECTION_SUSPENDED,
    +
    +        /**
    +         * Called when the connection has changed to {@link org.apache.curator.framework.state.ConnectionState#RECONNECTED}
    +         * <p/>
    +         * This is exposed so that users of the class can be notified of issues that
*might* affect normal operation.
    +         * The TreeCache is written such that listeners are not expected to do anything
special on this
    +         * event, except for those people who want to cause some application-specific
logic to fire when this occurs.
    +         * While the connection is down, the TreeCache will continue to have its state
from before it lost
    +         * the connection and after the connection is restored, the TreeCache will emit
normal child events
    +         * for all of the adds, deletes and updates that happened during the time that
it was disconnected.
    +         */
    +        CONNECTION_RECONNECTED,
    +
    +        /**
    +         * Called when the connection has changed to {@link org.apache.curator.framework.state.ConnectionState#LOST}
    +         * <p/>
    +         * This is exposed so that users of the class can be notified of issues that
*might* affect normal operation.
    +         * The TreeCache is written such that listeners are not expected to do anything
special on this
    +         * event, except for those people who want to cause some application-specific
logic to fire when this occurs.
    +         * While the connection is down, the TreeCache will continue to have its state
from before it lost
    +         * the connection and after the connection is restored, the TreeCache will emit
normal child events
    +         * for all of the adds, deletes and updates that happened during the time that
it was disconnected.
    +         */
    +        CONNECTION_LOST,
    +
    +        /**
    +         * Posted when the initial cache has been populated.
    --- End diff --
    
    update doc


> Recursive Node Cache
> --------------------
>
>                 Key: CURATOR-33
>                 URL: https://issues.apache.org/jira/browse/CURATOR-33
>             Project: Apache Curator
>          Issue Type: Improvement
>          Components: Recipes
>            Reporter: John Vines
>            Assignee: Jordan Zimmerman
>             Fix For: TBD
>
>         Attachments: CURATOR-33.2.patch, CURATOR-33.patch
>
>
> Currently the PathChildrenCache will trigger listen events for all children at the given
node. However, it would be useful to have a cache that would trigger listen events for the
entire hierarchy below the given node.



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