113 lines
3.5 KiB
Java
113 lines
3.5 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.tomcat.websocket;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.Future;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.TimeoutException;
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import java.util.concurrent.atomic.AtomicReference;
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import javax.websocket.SendHandler;
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import javax.websocket.SendResult;
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import org.apache.tomcat.util.res.StringManager;
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/**
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* Converts a Future to a SendHandler.
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*/
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class FutureToSendHandler implements Future<Void>, SendHandler {
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private static final StringManager sm = StringManager.getManager(FutureToSendHandler.class);
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private final CountDownLatch latch = new CountDownLatch(1);
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private final WsSession wsSession;
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private volatile AtomicReference<SendResult> result = new AtomicReference<>(null);
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public FutureToSendHandler(WsSession wsSession) {
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this.wsSession = wsSession;
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}
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// --------------------------------------------------------- SendHandler
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@Override
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public void onResult(SendResult result) {
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this.result.compareAndSet(null, result);
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latch.countDown();
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}
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// -------------------------------------------------------------- Future
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@Override
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public boolean cancel(boolean mayInterruptIfRunning) {
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// Cancelling the task is not supported
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return false;
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}
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@Override
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public boolean isCancelled() {
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// Cancelling the task is not supported
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return false;
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}
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@Override
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public boolean isDone() {
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return latch.getCount() == 0;
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}
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@Override
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public Void get() throws InterruptedException,
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ExecutionException {
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try {
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wsSession.registerFuture(this);
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latch.await();
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} finally {
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wsSession.unregisterFuture(this);
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}
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if (result.get().getException() != null) {
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throw new ExecutionException(result.get().getException());
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}
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return null;
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}
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@Override
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public Void get(long timeout, TimeUnit unit)
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throws InterruptedException, ExecutionException,
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TimeoutException {
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boolean retval = false;
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try {
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wsSession.registerFuture(this);
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retval = latch.await(timeout, unit);
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} finally {
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wsSession.unregisterFuture(this);
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}
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if (retval == false) {
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throw new TimeoutException(sm.getString("futureToSendHandler.timeout",
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Long.valueOf(timeout), unit.toString().toLowerCase()));
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}
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if (result.get().getException() != null) {
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throw new ExecutionException(result.get().getException());
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}
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return null;
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}
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}
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