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Initial implementation of ResourceWatcherService
Closes #4062
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79 changes: 79 additions & 0 deletions
79
src/main/java/org/elasticsearch/watcher/AbstractResourceWatcher.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| /* | ||
| * Licensed to ElasticSearch and Shay Banon under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. ElasticSearch 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.elasticsearch.watcher; | ||
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| import java.util.List; | ||
| import java.util.concurrent.CopyOnWriteArrayList; | ||
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| /** | ||
| * Abstract resource watcher framework, which handles adding and removing listeners | ||
| * and calling resource observer. | ||
| */ | ||
| public abstract class AbstractResourceWatcher<Listener> implements ResourceWatcher { | ||
| private final List<Listener> listeners = new CopyOnWriteArrayList<Listener>(); | ||
| private boolean initialized = false; | ||
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| @Override | ||
| public void init() { | ||
| if (!initialized) { | ||
| doInit(); | ||
| initialized = true; | ||
| } | ||
| } | ||
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| @Override | ||
| public void checkAndNotify() { | ||
| init(); | ||
| doCheckAndNotify(); | ||
| } | ||
|
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| /** | ||
| * Registers new listener | ||
| */ | ||
| public void addListener(Listener listener) { | ||
| listeners.add(listener); | ||
| } | ||
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| /** | ||
| * Unregisters a listener | ||
| */ | ||
| public void remove(Listener listener) { | ||
| listeners.remove(listener); | ||
| } | ||
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| /** | ||
| * Returns a list of listeners | ||
| */ | ||
| protected List<Listener> listeners() { | ||
| return listeners; | ||
| } | ||
|
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| /** | ||
| * Will be called once on initialization | ||
| */ | ||
| protected abstract void doInit(); | ||
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| /** | ||
| * Will be called periodically | ||
| * <p/> | ||
| * Implementing watcher should check resource and notify all {@link #listeners()}. | ||
| */ | ||
| protected abstract void doCheckAndNotify(); | ||
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| } |
75 changes: 75 additions & 0 deletions
75
src/main/java/org/elasticsearch/watcher/FileChangesListener.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| /* | ||
| * Licensed to ElasticSearch and Shay Banon under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. ElasticSearch 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.elasticsearch.watcher; | ||
|
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| import java.io.File; | ||
|
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| /** | ||
| * Callback interface that file changes File Watcher is using to notify listeners about changes. | ||
| */ | ||
| public class FileChangesListener { | ||
| /** | ||
| * Called for every file found in the watched directory during initialization | ||
| */ | ||
| public void onFileInit(File file) { | ||
|
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| } | ||
|
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| /** | ||
| * Called for every subdirectory found in the watched directory during initialization | ||
| */ | ||
| public void onDirectoryInit(File file) { | ||
|
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| } | ||
|
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| /** | ||
| * Called for every new file found in the watched directory | ||
| */ | ||
| public void onFileCreated(File file) { | ||
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| } | ||
|
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| /** | ||
| * Called for every file that disappeared in the watched directory | ||
| */ | ||
| public void onFileDeleted(File file) { | ||
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| } | ||
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| /** | ||
| * Called for every file that was changed in the watched directory | ||
| */ | ||
| public void onFileChanged(File file) { | ||
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| } | ||
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| /** | ||
| * Called for every new subdirectory found in the watched directory | ||
| */ | ||
| public void onDirectoryCreated(File file) { | ||
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| } | ||
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| /** | ||
| * Called for every file that disappeared in the watched directory | ||
| */ | ||
| public void onDirectoryDeleted(File file) { | ||
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| } | ||
| } |
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