components.execution.UniqueBlockingQueue.java Source code

Introduction

Here is the source code for components.execution.UniqueBlockingQueue.java

Source

/*
 * Copyright (c) 2014-2015 University of Ulm
 *
 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership.  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 components.execution;

import com.google.common.collect.Sets;

import java.util.Set;

/**
 * Created by daniel on 08.05.15.
 */
public class UniqueBlockingQueue<T> implements SimpleBlockingQueue<T> {

    private final Set<T> set;
    private final SimpleBlockingQueue<T> queue;

    public UniqueBlockingQueue(SimpleBlockingQueue<T> queue) {
        set = Sets.newConcurrentHashSet();
        this.queue = queue;
    }

    @Override
    public void add(T t) {
        if (this.set.add(t)) {
            this.queue.add(t);
        }
    }

    @Override
    public T take() throws InterruptedException {
        T t = this.queue.take();
        this.set.remove(t);
        return t;
    }

}