/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 io.undertow.util;
import java.util.concurrent.
LinkedBlockingDeque;
import java.util.function.
Consumer;
import java.util.function.
Supplier;
import io.undertow.
UndertowMessages;
/**
* Simple pool that attempts to maintain a specified number of objects in the pool. If more objects are created new ones
* are created on the fly, and then destroyed once the pool is full.
*
* @author ckozak
* @author Stuart Douglas
*/
public class
SimpleObjectPool<T> implements
ObjectPool {
private final
Supplier<T>
supplier;
private final
Consumer<T>
recycler;
private final
Consumer<T>
consumer;
private final
LinkedBlockingDeque<T>
pool;
public
SimpleObjectPool(int
poolSize,
Supplier<T>
supplier,
Consumer<T>
recycler,
Consumer<T>
consumer) {
this.
supplier =
supplier;
this.
recycler =
recycler;
this.
consumer =
consumer;
pool = new
LinkedBlockingDeque<T>(
poolSize);
}
public
SimpleObjectPool(int
poolSize,
Supplier<T>
supplier,
Consumer<T>
consumer) {
this(
poolSize,
supplier,
object -> {},
consumer);
}
@
Override
public
PooledObject allocate() {
T
obj =
pool.
poll();
if(
obj == null) {
obj =
supplier.
get();
}
final T
finObj =
obj;
return new
PooledObject() {
private volatile boolean
closed = false;
@
Override
public T
getObject() {
if (
closed) {
throw
UndertowMessages.
MESSAGES.
objectIsClosed();
}
return
finObj;
}
@
Override
public void
close() {
closed = true;
recycler.
accept(
finObj);
if(!
pool.
offer(
finObj)) {
consumer.
accept(
finObj);
}
}
};
}
}