| /* |
| * 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.cassandra.net; |
| |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| |
| /** |
| * A callback specialized for returning a value from a single target; that is, this is for messages |
| * that we only send to one recipient. |
| */ |
| public class AsyncOneResponse<T> implements IAsyncCallback<T> |
| { |
| private T result; |
| private boolean done; |
| private final long start = System.nanoTime(); |
| |
| public T get(long timeout, TimeUnit tu) throws TimeoutException |
| { |
| timeout = tu.toNanos(timeout); |
| boolean interrupted = false; |
| try |
| { |
| synchronized (this) |
| { |
| while (!done) |
| { |
| try |
| { |
| long overallTimeout = timeout - (System.nanoTime() - start); |
| if (overallTimeout <= 0) |
| { |
| throw new TimeoutException("Operation timed out."); |
| } |
| TimeUnit.NANOSECONDS.timedWait(this, overallTimeout); |
| } |
| catch (InterruptedException e) |
| { |
| interrupted = true; |
| } |
| } |
| } |
| } |
| finally |
| { |
| if (interrupted) |
| { |
| Thread.currentThread().interrupt(); |
| } |
| } |
| return result; |
| } |
| |
| public synchronized void response(MessageIn<T> response) |
| { |
| if (!done) |
| { |
| result = response.payload; |
| done = true; |
| this.notifyAll(); |
| } |
| } |
| |
| public boolean isLatencyForSnitch() |
| { |
| return false; |
| } |
| } |