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/*
* Copyright (c) 2010, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.grizzly;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import org.glassfish.grizzly.threadpool.DefaultWorkerThread;
/**
*
* @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 cached object type
* @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 cached object type
* @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 cached object type
* @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 cached object type
* @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 cached object type
* @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 cached object type
* @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;
}
}
}
