com.esotericsoftware.kryo.pool.SoftReferenceQueue Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of kryo-slf4j-shaded Show documentation
Fork of Esoteric Software's Kryo built by Nathan Sweet that replaces Minlog with slf4j as the logging facade. This contains the shaded reflectasm jar to prevent conflicts with other versions of asm.
The newest version!
/* Copyright (c) 2008, Nathan Sweet
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
 * conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
 * disclaimer in the documentation and/or other materials provided with the distribution.
 * - Neither the name of Esoteric Software nor the names of its contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

package com.esotericsoftware.kryo.pool;

import java.lang.ref.SoftReference;
import java.util.Collection;
import java.util.Iterator;
import java.util.Queue;

import com.esotericsoftware.kryo.Kryo;

/**
 * Internally uses {@link SoftReference}s for queued Kryo instances,
 * most importantly adjusts the {@link Queue#poll() poll}
 * behavior so that gc'ed Kryo instances are skipped.
 * Most other methods are unsupported.
 *
 * @author Martin Grotzke
 */
class SoftReferenceQueue implements Queue {
	
	private Queue> delegate;

	public SoftReferenceQueue (Queue delegate) {
		this.delegate = (Queue>)delegate;
	}

	public Kryo poll () {
		Kryo res;
		SoftReference ref;
		while((ref = delegate.poll()) != null) {
			if((res = ref.get()) != null) {
				return res;
			}
		}
		return null;
	}

	public boolean offer (Kryo e) {
		return delegate.offer(new SoftReference(e));
	}

	public boolean add (Kryo e) {
		return delegate.add(new SoftReference(e));
	}

	public int size () {
		return delegate.size();
	}

	public boolean isEmpty () {
		return delegate.isEmpty();
	}

	public boolean contains (Object o) {
		return delegate.contains(o);
	}

	public void clear () {
		delegate.clear();
	}

	public boolean equals (Object o) {
		return delegate.equals(o);
	}

	public int hashCode () {
		return delegate.hashCode();
	}
	
	@Override
	public String toString () {
		return getClass().getSimpleName() + super.toString();
	}

	public Iterator iterator () {
		throw new UnsupportedOperationException();
	}

	public Kryo remove () {
		throw new UnsupportedOperationException();
	}

	public Object[] toArray () {
		throw new UnsupportedOperationException();
	}

	public Kryo element () {
		throw new UnsupportedOperationException();
	}

	public Kryo peek () {
		throw new UnsupportedOperationException();
	}

	public  T[] toArray (T[] a) {
		throw new UnsupportedOperationException();
	}

	public boolean remove (Object o) {
		throw new UnsupportedOperationException();
	}

	public boolean containsAll (Collection c) {
		throw new UnsupportedOperationException();
	}

	public boolean addAll (Collection c) {
		throw new UnsupportedOperationException();
	}

	public boolean removeAll (Collection c) {
		throw new UnsupportedOperationException();
	}

	public boolean retainAll (Collection c) {
		throw new UnsupportedOperationException();
	}
}