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SingleOperationManager.java
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SingleOperationManager.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.glassfish.hk2.extras.operation.internal;
import java.lang.annotation.Annotation;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.locks.ReentrantLock;
import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.hk2.extras.operation.OperationContext;
import org.glassfish.hk2.extras.operation.OperationHandle;
import org.glassfish.hk2.extras.operation.OperationIdentifier;
import org.glassfish.hk2.utilities.ServiceLocatorUtilities;
/**
* @author jwells
*
*/
public class SingleOperationManager<T extends Annotation> {
private final static String ID_PREAMBLE = "OperationIdentifier(";
private final ReentrantLock operationLock = new ReentrantLock();
private final T scope;
private final HashMap<OperationIdentifier<T>, OperationHandleImpl<T>> openScopes = new HashMap<OperationIdentifier<T>, OperationHandleImpl<T>>();
private final HashMap<Long, OperationHandleImpl<T>> threadToHandleMap = new HashMap<Long, OperationHandleImpl<T>>();
private final ServiceLocator locator;
private final OperationContext<T> context;
private long scopedIdentifier;
private final ActiveDescriptor<?> operationDescriptor;
private boolean closed = false;
/* package */ @SuppressWarnings("unchecked")
SingleOperationManager(T scope,
ServiceLocator locator) {
this.scope = scope;
this.locator = locator;
OperationContext<T> found = null;
for (OperationContext<T> context : locator.getAllServices(OperationContext.class)) {
if (context.getScope().equals(scope.annotationType())) {
found = context;
break;
}
}
if (found == null) {
throw new IllegalStateException("Could not find the OperationContext for scope " + scope);
}
context = found;
context.setOperationManager(this);
OperationDescriptor<T> opDesc = new OperationDescriptor<T>(scope, this);
operationDescriptor = ServiceLocatorUtilities.addOneDescriptor(locator, opDesc);
}
private OperationIdentifierImpl<T> allocateNewIdentifier() {
return new OperationIdentifierImpl<T>(
ID_PREAMBLE + scopedIdentifier++ + "," + scope.annotationType().getName() + ")",
scope);
}
public OperationHandleImpl<T> createOperation() {
operationLock.lock();
try {
if (closed) {
throw new IllegalStateException("This manager has been closed");
}
OperationIdentifierImpl<T> id = allocateNewIdentifier();
OperationHandleImpl<T> created = new OperationHandleImpl<T>(this, id, operationLock, locator);
openScopes.put(id, created);
return created;
} finally {
operationLock.unlock();
}
}
/**
* Called with the operationLock held
*
* @param closeMe The non-null operation to close
*/
/* package */ void closeOperation(OperationHandleImpl<T> closeMe) {
openScopes.remove(closeMe.getIdentifier());
}
/**
* Explicitly called WITHOUT the operationLock held to avoid any deadlock
* with the context lock
*
* @param closeMe The non-null operation to close
*/
/* package */ void disposeAllOperationServices(OperationHandleImpl<T> closeMe) {
context.closeOperation(closeMe);
}
/**
* OperationLock must be held
*
* @param threadId The threadId to associate with this handle
* @param handle The handle to be associated with this thread
*/
/* package */ void associateWithThread(long threadId, OperationHandleImpl<T> handle) {
threadToHandleMap.put(threadId, handle);
}
/**
* OperationLock must be held
*
* @param threadId The threadId to disassociate with this handle
*/
/* package */ void disassociateThread(long threadId, OperationHandleImpl<T> toRemove) {
OperationHandleImpl<T> activeOnThread = threadToHandleMap.get(threadId);
if (activeOnThread == null || !activeOnThread.equals(toRemove)) return;
threadToHandleMap.remove(threadId);
}
/**
* OperationLock must be held
*
* @return The operation associated with the given thread
*/
/* package */ OperationHandleImpl<T> getCurrentOperationOnThisThread(long threadId) {
return threadToHandleMap.get(threadId);
}
/**
* OperationLock need NOT be held
*
* @return The operation associated with the current thread
*/
public OperationHandleImpl<T> getCurrentOperationOnThisThread() {
long threadId = Thread.currentThread().getId();
operationLock.lock();
try {
if (closed) return null;
return getCurrentOperationOnThisThread(threadId);
} finally {
operationLock.unlock();
}
}
/* package */ Set<OperationHandle<T>> getAllOperations() {
HashSet<OperationHandle<T>> retVal = new HashSet<OperationHandle<T>>();
operationLock.lock();
try {
if (closed) return Collections.emptySet();
retVal.addAll(openScopes.values());
return Collections.unmodifiableSet(retVal);
} finally {
operationLock.unlock();
}
}
/* package */ void shutdown() {
operationLock.lock();
try {
if (closed) return;
closed = true;
for (OperationHandleImpl<T> closeMe : openScopes.values()) {
closeMe.shutdownByFiat();
}
openScopes.clear();
threadToHandleMap.clear();
ServiceLocatorUtilities.removeOneDescriptor(locator, operationDescriptor);
} finally {
operationLock.unlock();
}
}
@Override
public String toString() {
return "SingleOperationManager(" + scope.annotationType().getName() + ",closed=" + closed + "," + System.identityHashCode(this) + ")";
}
}