/* | |
* Licensed to the Apache Software Foundation (ASF) under one | |
* or more contributor license agreements. See the NOTICE file | |
* distributed with this work for additional information | |
* regarding copyright ownership. The ASF licenses this file | |
* to you 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 org.apache.felix.ipojo.handlers.dependency; | |
/** | |
* Object managing thread local copy of required services. | |
* | |
* @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> | |
*/ | |
public class ServiceUsage extends ThreadLocal { | |
/** | |
* Structure contained in the Thread Local. | |
*/ | |
public class Usage { | |
/** | |
* Stack Size. | |
*/ | |
int m_stack = 0; | |
/** | |
* List of used objects. | |
*/ | |
Object[] m_objects; | |
/** | |
* Increment the statck level. | |
*/ | |
public void inc() { | |
m_stack++; | |
} | |
/** | |
* Decrement the stack level. | |
* @return true if the stack is 0 after the decrement. | |
*/ | |
public boolean dec() { | |
m_stack--; | |
return m_stack == 0; | |
} | |
/** | |
* Clear the service object array. | |
*/ | |
public void clear() { | |
m_objects = null; | |
} | |
} | |
/** | |
* Initialize the cached object. | |
* @return an empty Usage object. | |
* @see java.lang.ThreadLocal#initialValue() | |
*/ | |
public Object initialValue() { | |
return new Usage(); | |
} | |
} |