| /* |
| * 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.tomcat.websocket; |
| |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| import javax.websocket.SendHandler; |
| import javax.websocket.SendResult; |
| |
| import org.apache.tomcat.util.res.StringManager; |
| |
| |
| /** |
| * Converts a Future to a SendHandler. |
| */ |
| class FutureToSendHandler implements Future<Void>, SendHandler { |
| |
| private static final StringManager sm = StringManager.getManager(Constants.PACKAGE_NAME); |
| |
| private final CountDownLatch latch = new CountDownLatch(1); |
| private final WsSession wsSession; |
| private final boolean closeMessage; |
| private volatile AtomicReference<SendResult> result = new AtomicReference<>(null); |
| |
| public FutureToSendHandler(WsSession wsSession) { |
| this(wsSession, false); |
| } |
| |
| |
| public FutureToSendHandler(WsSession wsSession, boolean closeMessage) { |
| this.wsSession = wsSession; |
| this.closeMessage = closeMessage; |
| } |
| |
| |
| public boolean isCloseMessage() { |
| return closeMessage; |
| } |
| |
| |
| // --------------------------------------------------------- SendHandler |
| |
| @Override |
| public void onResult(SendResult result) { |
| this.result.compareAndSet(null, result); |
| latch.countDown(); |
| } |
| |
| |
| // -------------------------------------------------------------- Future |
| |
| @Override |
| public boolean cancel(boolean mayInterruptIfRunning) { |
| // Cancelling the task is not supported |
| return false; |
| } |
| |
| @Override |
| public boolean isCancelled() { |
| // Cancelling the task is not supported |
| return false; |
| } |
| |
| @Override |
| public boolean isDone() { |
| return latch.getCount() == 0; |
| } |
| |
| @Override |
| public Void get() throws InterruptedException, |
| ExecutionException { |
| try { |
| wsSession.registerFuture(this); |
| latch.await(); |
| } finally { |
| wsSession.unregisterFuture(this); |
| } |
| if (result.get().getException() != null) { |
| throw new ExecutionException(result.get().getException()); |
| } |
| return null; |
| } |
| |
| @Override |
| public Void get(long timeout, TimeUnit unit) |
| throws InterruptedException, ExecutionException, |
| TimeoutException { |
| boolean retval = false; |
| try { |
| wsSession.registerFuture(this); |
| retval = latch.await(timeout, unit); |
| } finally { |
| wsSession.unregisterFuture(this); |
| |
| } |
| if (retval == false) { |
| throw new TimeoutException(sm.getString("futureToSendHandler.timeout", |
| Long.valueOf(timeout), unit.toString().toLowerCase())); |
| } |
| if (result.get().getException() != null) { |
| throw new ExecutionException(result.get().getException()); |
| } |
| return null; |
| } |
| } |