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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2010-2013 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package org.glassfish.grizzly;
import org.glassfish.grizzly.threadpool.DefaultWorkerThread;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
/**
*
* @author oleksiys
*/
public final class ThreadCache {
private static final ObjectCacheElement[] INITIAL_OBJECT_ARRAY = new ObjectCacheElement[16];
private static final Map typeIndexMap =
new HashMap();
private static int indexCounter;
private static final ThreadLocal genericCacheAttr =
new ThreadLocal();
public static synchronized CachedTypeIndex obtainIndex(
Class clazz, int size) {
return obtainIndex(clazz.getName(), clazz, size);
}
@SuppressWarnings("unchecked")
public static synchronized CachedTypeIndex obtainIndex(String name,
Class clazz, int size) {
CachedTypeIndex typeIndex = typeIndexMap.get(name);
if (typeIndex == null) {
typeIndex = new CachedTypeIndex(indexCounter++, name, clazz, size);
typeIndexMap.put(name, typeIndex);
}
return typeIndex;
}
public static boolean putToCache(final CachedTypeIndex index, final E o) {
return putToCache(Thread.currentThread(), index, o);
}
public static boolean putToCache(final Thread currentThread,
final CachedTypeIndex index, final E o) {
if (currentThread instanceof DefaultWorkerThread) {
return ((DefaultWorkerThread) currentThread).putToCache(index, o);
} else {
ObjectCache genericCache = genericCacheAttr.get();
if (genericCache == null) {
genericCache = new ObjectCache();
genericCacheAttr.set(genericCache);
}
return genericCache.put(index, o);
}
}
/**
* Get the cached object with the given type index from cache.
* Unlike {@link #takeFromCache(org.glassfish.grizzly.ThreadCache.CachedTypeIndex)}, the
* object won't be removed from cache.
*
* @param
* @param index the cached object type index.
* @return cached object.
*/
public static E getFromCache(final CachedTypeIndex index) {
return getFromCache(Thread.currentThread(), index);
}
/**
* Get the cached object with the given type index from cache.
* Unlike {@link #takeFromCache(org.glassfish.grizzly.ThreadCache.CachedTypeIndex)}, the
* object won't be removed from cache.
*
* @param
* @param currentThread current {@link Thread}
* @param index the cached object type index.
* @return cached object.
*/
public static E getFromCache(final Thread currentThread,
final CachedTypeIndex index) {
assert currentThread == Thread.currentThread();
if (currentThread instanceof DefaultWorkerThread) {
return ((DefaultWorkerThread) currentThread).getFromCache(index);
} else {
final ObjectCache genericCache = genericCacheAttr.get();
if (genericCache != null) {
return genericCache.get(index);
}
return null;
}
}
/**
* Take the cached object with the given type index from cache.
* Unlike {@link #getFromCache(org.glassfish.grizzly.ThreadCache.CachedTypeIndex)}, the
* object will be removed from cache.
*
* @param
* @param index the cached object type index
* @return cached object
*/
public static E takeFromCache(final CachedTypeIndex index) {
return takeFromCache(Thread.currentThread(), index);
}
/**
* Take the cached object with the given type index from cache.
* Unlike {@link #getFromCache(org.glassfish.grizzly.ThreadCache.CachedTypeIndex)}, the
* object will be removed from cache.
*
* @param
* @param currentThread current {@link Thread}
* @param index the cached object type index
* @return cached object
*/
public static E takeFromCache(final Thread currentThread,
final CachedTypeIndex index) {
if (currentThread instanceof DefaultWorkerThread) {
return ((DefaultWorkerThread) currentThread).takeFromCache(index);
} else {
final ObjectCache genericCache = genericCacheAttr.get();
if (genericCache != null) {
return genericCache.take(index);
}
return null;
}
}
public static final class ObjectCache {
private ObjectCacheElement[] objectCacheElements;
public boolean put(final CachedTypeIndex index, final Object o) {
if (objectCacheElements != null &&
index.getIndex() < objectCacheElements.length) {
ObjectCacheElement objectCache = objectCacheElements[index.getIndex()];
if (objectCache == null) {
objectCache = new ObjectCacheElement(index.size);
objectCacheElements[index.getIndex()] = objectCache;
}
return objectCache.put(o);
}
final ObjectCacheElement[] arrayToGrow =
(objectCacheElements != null) ?
objectCacheElements : INITIAL_OBJECT_ARRAY;
final int newSize = Math.max(index.getIndex() + 1,
(arrayToGrow.length * 3) / 2 + 1);
objectCacheElements = Arrays.copyOf(arrayToGrow, newSize);
final ObjectCacheElement objectCache = new ObjectCacheElement(index.getSize());
objectCacheElements[index.getIndex()] = objectCache;
return objectCache.put(o);
}
/**
* Get the cached object with the given type index from cache.
* Unlike {@link #take(org.glassfish.grizzly.ThreadCache.CachedTypeIndex)}, the
* object won't be removed from cache.
*
* @param
* @param index the cached object type index.
* @return cached object.
*/
@SuppressWarnings("unchecked")
public E get(final CachedTypeIndex index) {
final int idx;
if (objectCacheElements != null &&
(idx = index.getIndex()) < objectCacheElements.length) {
final ObjectCacheElement objectCache = objectCacheElements[idx];
if (objectCache == null) return null;
return (E) objectCache.get();
}
return null;
}
/**
* Take the cached object with the given type index from cache.
* Unlike {@link #get(org.glassfish.grizzly.ThreadCache.CachedTypeIndex)}, the
* object will be removed from cache.
*
* @param
* @param index the cached object type index.
* @return cached object.
*/
@SuppressWarnings("unchecked")
public E take(final CachedTypeIndex index) {
final int idx;
if (objectCacheElements != null &&
(idx = index.getIndex()) < objectCacheElements.length) {
final ObjectCacheElement objectCache = objectCacheElements[idx];
if (objectCache == null) return null;
return (E) objectCache.take();
}
return null;
}
}
public static final class ObjectCacheElement {
private final int size;
private final Object[] cache;
private int index;
public ObjectCacheElement(int size) {
this.size = size;
cache = new Object[size];
}
public boolean put(Object o) {
if (index < size) {
cache[index++] = o;
return true;
}
return false;
}
/**
* Get (peek) the object from cache.
* Unlike {@link #take()} the object will not be removed from cache.
*
* @return object from cache.
*/
public Object get() {
if (index > 0) {
final Object o = cache[index - 1];
return o;
}
return null;
}
/**
* Take (poll) the object from cache.
* Unlike {@link #get()} the object will be removed from cache.
*
* @return object from cache.
*/
public Object take() {
if (index > 0) {
index--;
final Object o = cache[index];
cache[index] = null;
return o;
}
return null;
}
}
public static final class CachedTypeIndex {
private final int index;
private final Class clazz;
private final int size;
private final String name;
public CachedTypeIndex(final int index, final String name,
final Class clazz, final int size) {
this.index = index;
this.name = name;
this.clazz = clazz;
this.size = size;
}
public int getIndex() {
return index;
}
public String getName() {
return name;
}
public Class getClazz() {
return clazz;
}
public int getSize() {
return size;
}
}
}
