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InstantiationServiceImpl.java
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InstantiationServiceImpl.java
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/*
* Copyright (c) 2015, 2024 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.jvnet.hk2.internal;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.concurrent.locks.ReentrantLock;
import org.glassfish.hk2.api.DescriptorVisibility;
import org.glassfish.hk2.api.Injectee;
import org.glassfish.hk2.api.InstantiationData;
import org.glassfish.hk2.api.InstantiationService;
import org.glassfish.hk2.api.Visibility;
/**
* @author jwells
*
*/
@Visibility(DescriptorVisibility.LOCAL)
public class InstantiationServiceImpl implements InstantiationService {
private final ReentrantLock lock = new ReentrantLock();
private final HashMap<Long, LinkedList<Injectee>> injecteeStack = new HashMap<Long, LinkedList<Injectee>>();
/* (non-Javadoc)
* @see org.glassfish.hk2.api.InstantiationService#getInstantiationData()
*/
@Override
public InstantiationData getInstantiationData() {
lock.lock();
try {
long tid = Thread.currentThread().getId();
LinkedList<Injectee> threadStack = injecteeStack.get(tid);
if (threadStack == null) return null;
if (threadStack.isEmpty()) return null;
final Injectee head = threadStack.getLast();
return new InstantiationData() {
@Override
public Injectee getParentInjectee() {
return head;
}
@Override
public String toString() {
return "InstantiationData(" + head + "," + System.identityHashCode(this) + ")";
}
};
} finally {
lock.unlock();
}
}
public void pushInjecteeParent(Injectee injectee) {
lock.lock();
try {
long tid = Thread.currentThread().getId();
LinkedList<Injectee> threadStack = injecteeStack.get(tid);
if (threadStack == null) {
threadStack = new LinkedList<Injectee>();
injecteeStack.put(tid, threadStack);
}
threadStack.addLast(injectee);
} finally {
lock.unlock();
}
}
public void popInjecteeParent() {
lock.lock();
try {
long tid = Thread.currentThread().getId();
LinkedList<Injectee> threadStack = injecteeStack.get(tid);
if (threadStack == null) return;
threadStack.removeLast();
if (threadStack.isEmpty()) {
// prevents memory leaks for long dead threads
injecteeStack.remove(tid);
}
} finally {
lock.unlock();
}
}
@Override
public String toString() {
return "InstantiationServiceImpl(" + injecteeStack.keySet() + "," + System.identityHashCode(this) + ")";
}
}