org.projectodd.wunderboss.messaging.hornetq.HQResponse Maven / Gradle / Ivy

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/*
 * Copyright 2014-2015 Red Hat, Inc, and individual contributors.
 *
 * Licensed 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.projectodd.wunderboss.messaging.hornetq;

import org.projectodd.wunderboss.messaging.Message;
import org.projectodd.wunderboss.messaging.Response;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class HQResponse implements Response {

    @Override
    public boolean cancel(boolean mayInterruptIfRunning) {
        throw new UnsupportedOperationException("HornetQ response futures can't be cancelled.");
    }

    @Override
    public boolean isCancelled() {
        return false;
    }

    @Override
    public synchronized boolean isDone() {
        return (this.value != null);
    }

    @Override
    public Message get() throws InterruptedException, ExecutionException {
        try {
            return get(0, TimeUnit.SECONDS);
        } catch (TimeoutException e) {
            //shouldn't happen
            e.printStackTrace();

            return null;
        }
    }

    @Override
    public synchronized Message get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
        if (!isDone()) {
            wait(unit.toMillis(timeout));

            if (!isDone()) {
                throw new TimeoutException();
            }
        }

        return this.value;
    }

    public synchronized void deliver(Message value) {
        if (this.value != null) {
            throw new IllegalStateException("Delivery to a future that is already delivered.");
        }
        this.value = value;
        notifyAll();
    }

    private Message value = null;
}