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/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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 com.replica.replicaisland;
/**
* A general-purpose pool of objects. Objects in the pool are allocated up front and then
* passed out to requesting objects until the pool is exhausted (at which point an error is thrown).
* Code that requests objects from the pool should return them to the pool when they are finished.
* This class is abstract; derivations need to implement the fill() function to fill the pool, and
* may wish to override release() to clear state on objects as they are returned to the pool.
*/
public abstract class ObjectPool extends BaseObject {
private FixedSizeArray<Object> mAvailable;
private int mSize;
private static final int DEFAULT_SIZE = 32;
public ObjectPool() {
super();
setSize(DEFAULT_SIZE);
}
public ObjectPool(int size) {
super();
setSize(size);
}
@Override
public void reset() {
}
/** Allocates an object from the pool */
protected Object allocate() {
Object result = mAvailable.removeLast();
assert result != null : "Object pool of type " + this.getClass().getSimpleName()
+ " exhausted!!";
return result;
}
/** Returns an object to the pool. */
public void release(Object entry) {
mAvailable.add(entry);
}
/** Returns the number of pooled elements that have been allocated but not released. */
public int getAllocatedCount() {
return mAvailable.getCapacity() - mAvailable.getCount();
}
private void setSize(int size) {
mSize = size;
mAvailable = new FixedSizeArray<Object>(mSize);
fill();
}
protected abstract void fill();
protected FixedSizeArray<Object> getAvailable() {
return mAvailable;
}
protected int getSize() {
return mSize;
}
}
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