| /** |
| * 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; |
| |
| import org.apache.curator.framework.CuratorFramework; |
| import org.apache.curator.utils.ThreadUtils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Future; |
| |
| /** |
| * Utility class to allow execution of logic once a ZooKeeper connection becomes available. |
| */ |
| public class AfterConnectionEstablished |
| { |
| private final static Logger log = LoggerFactory.getLogger(AfterConnectionEstablished.class); |
| |
| /** |
| * Spawns a new new background thread that will block until a connection is available and |
| * then execute the 'runAfterConnection' logic |
| * |
| * @param client The curator client |
| * @param runAfterConnection The logic to run |
| * @return future of the task so it can be canceled, etc. if needed |
| */ |
| public static Future<?> execute(final CuratorFramework client, final Runnable runAfterConnection) throws Exception |
| { |
| //Block until connected |
| final ExecutorService executor = ThreadUtils.newSingleThreadExecutor(ThreadUtils.getProcessName(runAfterConnection.getClass())); |
| Runnable internalCall = new Runnable() |
| { |
| @Override |
| public void run() |
| { |
| try |
| { |
| client.blockUntilConnected(); |
| runAfterConnection.run(); |
| } |
| catch ( Exception e ) |
| { |
| ThreadUtils.checkInterrupted(e); |
| log.error("An error occurred blocking until a connection is available", e); |
| } |
| finally |
| { |
| executor.shutdown(); |
| } |
| } |
| }; |
| return executor.submit(internalCall); |
| } |
| |
| private AfterConnectionEstablished() |
| { |
| } |
| } |