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package com.firefly.utils.lang.pool;

import com.firefly.utils.lang.AbstractLifeCycle;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;

public class BoundedBlockingPool extends AbstractLifeCycle implements BlockingPool {

	private BlockingQueue queue;
	private int initSize;
	private ObjectFactory factory;
	private Validator validator;
	private Dispose dispose;

	public BoundedBlockingPool(int initSize, int maxSize, ObjectFactory factory, Validator validator,
			Dispose dispose) {
		this(initSize, new LinkedBlockingQueue<>(maxSize), factory, validator, dispose);
	}

	public BoundedBlockingPool(int initSize, BlockingQueue queue, ObjectFactory factory, Validator validator,
			Dispose dispose) {
		this.initSize = initSize;
		this.factory = factory;
		this.validator = validator;
		this.dispose = dispose;
		this.queue = queue;
	}

	@Override
	public T get() {
		start();
		T t = queue.poll();
		return _take(t);
	}

	@Override
	public T take() throws InterruptedException {
		start();
		T t = queue.take();
		return _take(t);
	}

	@Override
	public T take(long time, TimeUnit unit) throws InterruptedException {
		start();
		T t = queue.poll(time, unit);
		return _take(t);
	}

	private T _take(T t) {
		if (t == null) {
			return factory.createNew();
		} else {
			if (validator.isValid(t)) {
				return t;
			} else {
				return factory.createNew();
			}
		}
	}

	@Override
	public void release(T t) {
		if (validator.isValid(t)) {
			boolean success = queue.offer(t);
			if (!success) {
				dispose.destroy(t);
			}
		} else {
			dispose.destroy(t);
		}
	}

	@Override
	public void put(T t) throws InterruptedException {
		if (validator.isValid(t)) {
			queue.put(t);
		} else {
			dispose.destroy(t);
		}
	}

	@Override
	public boolean put(T t, long timeout, TimeUnit unit) throws InterruptedException {
		if (validator.isValid(t)) {
			boolean success = queue.offer(t, timeout, unit);
			if (!success) {
				dispose.destroy(t);
			}
			return success;
		} else {
			dispose.destroy(t);
			return false;
		}
	}

	@Override
	protected void init() {
		for (int i = 0; i < initSize; i++) {
			queue.offer(factory.createNew());
		}
	}

	@Override
	protected void destroy() {
		T t;
		while ((t = queue.poll()) != null) {
			dispose.destroy(t);
		}
	}

	@Override
	public int size() {
		return queue.size();
	}

	@Override
	public boolean isEmpty() {
		return queue.isEmpty();
	}

}