/*
* Copyright (c) 2007, 2008, 2014 XStream Committers.
* All rights reserved.
*
* The software in this package is published under the terms of the BSD
* style license a copy of which has been included with this distribution in
* the LICENSE.txt file.
*
* Created on 20. September 2007 by Joerg Schaible
*/
package com.thoughtworks.xstream.core.util;
import java.beans.PropertyEditor;
import com.thoughtworks.xstream.converters.reflection.ObjectAccessException;
/**
* Wrapper around {@link PropertyEditor} that can be called by multiple threads concurrently.
* <p>
* A PropertyEditor is not thread safe. To make best use of resources, the PropertyEditor provides a dynamically sizing
* pool of instances, each of which will only be called by a single thread at a time.
* </p>
* <p>
* The pool has a maximum capacity, to limit overhead. If all instances in the pool are in use and another is required,
* it shall block until one becomes available.
* </p>
*
* @author Jörg Schaible
* @since 1.3
*/
public class ThreadSafePropertyEditor {
private final Class<? extends PropertyEditor> editorType;
private final Pool<PropertyEditor> pool;
public ThreadSafePropertyEditor(
final Class<? extends PropertyEditor> type, final int initialPoolSize, final int maxPoolSize) {
if (!PropertyEditor.class.isAssignableFrom(type)) {
throw new IllegalArgumentException(type.getName() + " is not a " + PropertyEditor.class.getName());
}
editorType = type;
pool = new Pool<PropertyEditor>(initialPoolSize, maxPoolSize, new Pool.Factory<PropertyEditor>() {
@Override
public PropertyEditor newInstance() {
try {
return editorType.newInstance();
} catch (final InstantiationException e) {
throw new ObjectAccessException("Could not call default constructor of " + editorType.getName(), e);
} catch (final IllegalAccessException e) {
throw new ObjectAccessException("Could not call default constructor of " + editorType.getName(), e);
}
}
});
}
public String getAsText(final Object object) {
final PropertyEditor editor = fetchFromPool();
try {
editor.setValue(object);
return editor.getAsText();
} finally {
pool.putInPool(editor);
}
}
public Object setAsText(final String str) {
final PropertyEditor editor = fetchFromPool();
try {
editor.setAsText(str);
return editor.getValue();
} finally {
pool.putInPool(editor);
}
}
private PropertyEditor fetchFromPool() {
return pool.fetchFromPool();
}
}