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/**
 * Copyright (C) 2016 Hurence ([email protected])
 *
 * 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 com.hurence.logisland.util.runner;

import com.hurence.logisland.record.Record;
import com.hurence.logisland.record.StandardRecord;

import java.util.Collection;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;





public class RecordQueue {

    private final BlockingQueue queue;

    private final ReadWriteLock rwLock = new ReentrantReadWriteLock();
    private final Lock readLock = rwLock.readLock();
    private final Lock writeLock = rwLock.writeLock();

    public RecordQueue() {
        queue = new LinkedBlockingQueue<>();
    }

    public void offer(final Record record) {
        writeLock.lock();
        try {
            queue.offer(record);
        } finally {
            writeLock.unlock();
        }
    }

    public Record poll() {
        writeLock.lock();
        try {
            return queue.poll();
        } finally {
            writeLock.unlock();
        }
    }

    public void addAll(final Collection records) {
        writeLock.lock();
        try {
            queue.addAll(records);
        } finally {
            writeLock.unlock();
        }
    }

    public QueueSize size() {
        readLock.lock();
        try {
            final int count = queue.size();

            long contentSize = 0L;
            for (final Record record : queue) {
                contentSize += record.sizeInBytes();
            }
            return new QueueSize(count, contentSize);
        } finally {
            readLock.unlock();
        }
    }

    public boolean isEmpty() {
        return size().getObjectCount() == 0;
    }

    public void clear(){
        writeLock.lock();
        try {
            queue.clear();
        } finally {
            writeLock.unlock();
        }
    }
}