Initial import of ObjectPool project
commit
09350d01a8
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@ -0,0 +1,6 @@
|
|||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<classpath>
|
||||
<classpathentry kind="src" path="src"/>
|
||||
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
|
||||
<classpathentry kind="output" path="classes"/>
|
||||
</classpath>
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|
@ -0,0 +1 @@
|
|||
/classes/
|
|
@ -0,0 +1,17 @@
|
|||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<projectDescription>
|
||||
<name>ObjectPool</name>
|
||||
<comment></comment>
|
||||
<projects>
|
||||
</projects>
|
||||
<buildSpec>
|
||||
<buildCommand>
|
||||
<name>org.eclipse.jdt.core.javabuilder</name>
|
||||
<arguments>
|
||||
</arguments>
|
||||
</buildCommand>
|
||||
</buildSpec>
|
||||
<natures>
|
||||
<nature>org.eclipse.jdt.core.javanature</nature>
|
||||
</natures>
|
||||
</projectDescription>
|
|
@ -0,0 +1,15 @@
|
|||
- Dorkbox ObjectPool - Apache 2.0 License
|
||||
https://github.com/dorkbox
|
||||
Copyright 2014, dorkbox, llc
|
||||
Fast (via unsafe) and compatible java object pool factory
|
||||
|
||||
|
||||
- FastObjectPool - Apache 2.0 License
|
||||
http://ashkrit.blogspot.com/2013/05/lock-less-java-object-pool.html
|
||||
https://github.com/ashkrit/blog/tree/master/FastObjectPool
|
||||
Copyright 2013, Ashkrit
|
||||
|
||||
|
||||
- Furious ObjectPool - Apache 2.0 License
|
||||
https://code.google.com/p/furious-objectpool/
|
||||
Copyright Eddie Raapoto, 2012
|
|
@ -0,0 +1,218 @@
|
|||
Apache License
|
||||
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|
||||
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|
||||
|
||||
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@ -0,0 +1,38 @@
|
|||
/*
|
||||
* Copyright 2014 dorkbox, llc
|
||||
*
|
||||
* 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
|
||||
*
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||||
* 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 dorkbox.objectPool;
|
||||
|
||||
import java.lang.reflect.Field;
|
||||
import java.security.PrivilegedExceptionAction;
|
||||
|
||||
public class GetUnsafe implements PrivilegedExceptionAction<sun.misc.Unsafe> {
|
||||
GetUnsafe() {
|
||||
}
|
||||
|
||||
@Override
|
||||
public sun.misc.Unsafe run() throws Exception {
|
||||
Class<sun.misc.Unsafe> unsafeClass = sun.misc.Unsafe.class;
|
||||
Field theUnsafe = unsafeClass.getDeclaredField("theUnsafe");
|
||||
theUnsafe.setAccessible(true);
|
||||
|
||||
Object unsafeObject = theUnsafe.get(null);
|
||||
if (unsafeClass.isInstance(unsafeObject)) {
|
||||
return unsafeClass.cast(unsafeObject);
|
||||
}
|
||||
|
||||
throw new NoSuchFieldError("the Unsafe");
|
||||
}
|
||||
}
|
|
@ -0,0 +1,28 @@
|
|||
/*
|
||||
* Copyright 2014 dorkbox, llc
|
||||
*
|
||||
* 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 dorkbox.objectPool;
|
||||
|
||||
public interface ObjectPool<T> {
|
||||
/**
|
||||
* Takes an object from the pool
|
||||
*/
|
||||
public ObjectPoolHolder<T> take();
|
||||
|
||||
/**
|
||||
* Return object to the pool
|
||||
*/
|
||||
public void release(ObjectPoolHolder<T> object);
|
||||
}
|
|
@ -0,0 +1,38 @@
|
|||
/*
|
||||
* Copyright 2014 dorkbox, llc
|
||||
*
|
||||
* 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 dorkbox.objectPool;
|
||||
|
||||
|
||||
public class ObjectPoolFactory {
|
||||
|
||||
private ObjectPoolFactory() {
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a pool of the specified size
|
||||
*/
|
||||
public static <T> ObjectPool<T> create(PoolableObject<T> poolableObject, int size) {
|
||||
try {
|
||||
// here we use FAST (via UNSAFE)
|
||||
UnsafeObjectPool<T> fastObjectPool = new UnsafeObjectPool<T>(poolableObject, size);
|
||||
return fastObjectPool;
|
||||
} catch (Throwable ignored) {
|
||||
// fallback (LinkedBlockingDeque) in case UNSAFE isn't available. (ie: android)
|
||||
SafeObjectPool<T> slowObjectPool = new SafeObjectPool<T>(poolableObject, size);
|
||||
return slowObjectPool;
|
||||
}
|
||||
}
|
||||
}
|
|
@ -0,0 +1,32 @@
|
|||
/*
|
||||
* Copyright 2014 dorkbox, llc
|
||||
*
|
||||
* 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 dorkbox.objectPool;
|
||||
|
||||
import java.util.concurrent.atomic.AtomicBoolean;
|
||||
|
||||
public class ObjectPoolHolder<T> {
|
||||
private T value;
|
||||
|
||||
AtomicBoolean state = new AtomicBoolean(true);
|
||||
|
||||
public ObjectPoolHolder(T value) {
|
||||
this.value = value;
|
||||
}
|
||||
|
||||
public T getValue() {
|
||||
return this.value;
|
||||
}
|
||||
}
|
|
@ -0,0 +1,23 @@
|
|||
/*
|
||||
* Copyright 2014 dorkbox, llc
|
||||
*
|
||||
* 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 dorkbox.objectPool;
|
||||
|
||||
public interface PoolableObject<T> {
|
||||
/**
|
||||
* called when a new instance is created
|
||||
*/
|
||||
public T create();
|
||||
}
|
|
@ -0,0 +1,80 @@
|
|||
/*
|
||||
* from: https://code.google.com/p/furious-objectpool/
|
||||
* copyright Eddie Raapoto 2012
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* Modified by dorkbox, llc
|
||||
*/
|
||||
package dorkbox.objectPool;
|
||||
|
||||
import java.util.concurrent.LinkedBlockingDeque;
|
||||
|
||||
|
||||
class SafeObjectPool<T> implements ObjectPool<T> {
|
||||
|
||||
private static final boolean FREE = true;
|
||||
private static final boolean USED = false;
|
||||
|
||||
|
||||
private final LinkedBlockingDeque<ObjectPoolHolder<T>> queue;
|
||||
|
||||
private ThreadLocal<ObjectPoolHolder<T>> localValue = new ThreadLocal<>();
|
||||
|
||||
SafeObjectPool(PoolableObject<T> poolableObject, int size) {
|
||||
|
||||
this.queue = new LinkedBlockingDeque<ObjectPoolHolder<T>>(size);
|
||||
|
||||
for (int x=0;x<size;x++) {
|
||||
this.queue.add(new ObjectPoolHolder<T>(poolableObject.create()));
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public ObjectPoolHolder<T> take() {
|
||||
// if we have an object available in the cache, use it instead.
|
||||
ObjectPoolHolder<T> localObject = this.localValue.get();
|
||||
if (localObject != null) {
|
||||
if (localObject.state.compareAndSet(FREE, USED)) {
|
||||
return localObject;
|
||||
}
|
||||
}
|
||||
|
||||
ObjectPoolHolder<T> holder = this.queue.poll();
|
||||
|
||||
if (holder == null) {
|
||||
return null;
|
||||
}
|
||||
|
||||
// the use of a threadlocal reference here helps eliminates contention. This also checks OTHER threads,
|
||||
// as they might have one sitting on the cache
|
||||
if (holder.state.compareAndSet(FREE, USED)) {
|
||||
this.localValue.set(holder);
|
||||
return holder;
|
||||
} else {
|
||||
// put it back into the queue
|
||||
this.queue.offer(holder);
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public void release(ObjectPoolHolder<T> object) {
|
||||
if (object.state.compareAndSet(USED, FREE)) {
|
||||
this.queue.offer(object);
|
||||
}
|
||||
else {
|
||||
throw new IllegalArgumentException("Invalid reference passed");
|
||||
}
|
||||
}
|
||||
}
|
|
@ -0,0 +1,130 @@
|
|||
/*
|
||||
* from: http://ashkrit.blogspot.com/2013/05/lock-less-java-object-pool.html
|
||||
* https://github.com/ashkrit/blog/tree/master/FastObjectPool
|
||||
* copyright ashkrit 2013
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* Modified by dorkbox, llc
|
||||
*/
|
||||
package dorkbox.objectPool;
|
||||
|
||||
import java.security.AccessController;
|
||||
import java.util.concurrent.locks.ReentrantLock;
|
||||
|
||||
|
||||
class UnsafeObjectPool<T> implements ObjectPool<T> {
|
||||
|
||||
private final sun.misc.Unsafe unsafe;
|
||||
|
||||
private static final boolean FREE = true;
|
||||
private static final boolean USED = false;
|
||||
|
||||
private final ObjectPoolHolder<T>[] objects;
|
||||
|
||||
private volatile int takePointer;
|
||||
private volatile int releasePointer;
|
||||
|
||||
private final int mask;
|
||||
private final long BASE;
|
||||
private final long INDEXSCALE;
|
||||
private final long ASHIFT;
|
||||
|
||||
public ReentrantLock lock = new ReentrantLock();
|
||||
private ThreadLocal<ObjectPoolHolder<T>> localValue = new ThreadLocal<>();
|
||||
|
||||
UnsafeObjectPool(PoolableObject<T> poolableObject, int size) throws Throwable {
|
||||
this.unsafe = AccessController.doPrivileged(new GetUnsafe());
|
||||
|
||||
if (this.unsafe == null) {
|
||||
throw new Exception("Unable to load unsafe");
|
||||
}
|
||||
|
||||
int newSize = 1;
|
||||
while (newSize < size) {
|
||||
newSize = newSize << 1;
|
||||
}
|
||||
|
||||
size = newSize;
|
||||
|
||||
@SuppressWarnings({"unchecked", "rawtypes"})
|
||||
ObjectPoolHolder<T>[] stuff = new ObjectPoolHolder[size];
|
||||
this.objects = stuff;
|
||||
|
||||
for (int x=0;x<size;x++) {
|
||||
this.objects[x] = new ObjectPoolHolder<T>(poolableObject.create());
|
||||
}
|
||||
|
||||
this.mask = size-1;
|
||||
this.releasePointer = size;
|
||||
this.BASE = this.unsafe.arrayBaseOffset(ObjectPoolHolder[].class);
|
||||
this.INDEXSCALE = this.unsafe.arrayIndexScale(ObjectPoolHolder[].class);
|
||||
this.ASHIFT = 31 - Integer.numberOfLeadingZeros((int) this.INDEXSCALE);
|
||||
}
|
||||
|
||||
@Override
|
||||
public ObjectPoolHolder<T> take() {
|
||||
int localTakePointer;
|
||||
|
||||
// if we have an object available in the cache, use it instead.
|
||||
ObjectPoolHolder<T> localObject = this.localValue.get();
|
||||
if (localObject != null) {
|
||||
if (localObject.state.compareAndSet(FREE, USED)) {
|
||||
return localObject;
|
||||
}
|
||||
}
|
||||
|
||||
sun.misc.Unsafe unsafe = this.unsafe;
|
||||
|
||||
while (this.releasePointer != (localTakePointer=this.takePointer)) {
|
||||
int index = localTakePointer & this.mask;
|
||||
|
||||
ObjectPoolHolder<T> holder = this.objects[index];
|
||||
//if(holder!=null && THE_UNSAFE.compareAndSwapObject(objects, (index*INDEXSCALE)+BASE, holder, null))
|
||||
if (holder != null && unsafe.compareAndSwapObject(this.objects, (index<<this.ASHIFT)+this.BASE, holder, null)) {
|
||||
this.takePointer = localTakePointer+1;
|
||||
|
||||
// the use of a threadlocal reference here helps eliminates contention. This also checks OTHER threads,
|
||||
// as they might have one sitting on the cache
|
||||
if (holder.state.compareAndSet(FREE, USED)) {
|
||||
this.localValue.set(holder);
|
||||
return holder;
|
||||
}
|
||||
}
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void release(ObjectPoolHolder<T> object) {
|
||||
try {
|
||||
this.lock.lockInterruptibly();
|
||||
|
||||
int localValue = this.releasePointer;
|
||||
//long index = ((localValue & mask) * INDEXSCALE ) + BASE;
|
||||
long index = ((localValue & this.mask)<<this.ASHIFT ) + this.BASE;
|
||||
|
||||
if (object.state.compareAndSet(USED, FREE)) {
|
||||
this.unsafe.putOrderedObject(this.objects, index, object);
|
||||
this.releasePointer = localValue+1;
|
||||
}
|
||||
else {
|
||||
throw new IllegalArgumentException("Invalid reference passed");
|
||||
}
|
||||
} catch (InterruptedException e) {
|
||||
}
|
||||
finally {
|
||||
this.lock.unlock();
|
||||
}
|
||||
}
|
||||
}
|
Loading…
Reference in New Issue