/*
* 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.geode.distributed.internal.deadlock;
import java.io.Serializable;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.apache.geode.distributed.internal.InternalDistributedSystem;
import org.apache.geode.distributed.internal.locks.DLockService;
import org.apache.geode.distributed.internal.locks.DLockToken;
/**
* Report dependencies on dlocks that exist in theis VM.
*
*
*/
public class DLockDependencyMonitor implements DependencyMonitor {
static final DLockDependencyMonitor INSTANCE;
static {
INSTANCE = new DLockDependencyMonitor();
// DependencyMonitorManager.addMonitor(INSTANCE);
}
public Set<Dependency<Thread, Serializable>> getBlockedThreads(Thread[] allThreads) {
Set<Dependency<Thread, Serializable>> results = new HashSet<Dependency<Thread, Serializable>>();
DLockService.dumpAllServices(); // for investigating bug #43496
Map<String, DLockService> services = DLockService.snapshotAllServices();
for (Map.Entry<String, DLockService> entry : services.entrySet()) {
String serviceName = entry.getKey();
DLockService service = entry.getValue();
UnsafeThreadLocal<Object> blockedThreadLocal = service.getBlockedOn();
for (Thread thread : allThreads) {
Object lockName = blockedThreadLocal.get(thread);
if (lockName != null) {
results.add(new Dependency<Thread, Serializable>(thread,
new LockId(serviceName, (Serializable) lockName)));
}
}
}
return results;
}
public Set<Dependency<Serializable, Thread>> getHeldResources(Thread[] allThreads) {
InternalDistributedSystem ds = InternalDistributedSystem.getAnyInstance();
if (ds == null) {
return Collections.emptySet();
}
Set<Dependency<Serializable, Thread>> results = new HashSet<Dependency<Serializable, Thread>>();
Map<String, DLockService> services = DLockService.snapshotAllServices();
for (Map.Entry<String, DLockService> entry : services.entrySet()) {
String serviceName = entry.getKey();
DLockService service = entry.getValue();
Map<Object, DLockToken> tokens = service.snapshotService();
for (Map.Entry<Object, DLockToken> tokenEntry : tokens.entrySet()) {
Object tokenName = tokenEntry.getKey();
DLockToken token = tokenEntry.getValue();
synchronized (token) {
Thread holdingThread = token.getThread();
if (holdingThread != null) {
results.add(
new Dependency(new LockId(serviceName, (Serializable) tokenName), holdingThread));
}
}
}
}
return results;
}
private static class LockId implements Serializable {
private final String serviceName;
private final Serializable tokenName;
public LockId(String serviceName, Serializable tokenName) {
this.serviceName = serviceName;
this.tokenName = tokenName;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((serviceName == null) ? 0 : serviceName.hashCode());
result = prime * result + ((tokenName == null) ? 0 : tokenName.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (!(obj instanceof LockId))
return false;
LockId other = (LockId) obj;
if (serviceName == null) {
if (other.serviceName != null)
return false;
} else if (!serviceName.equals(other.serviceName))
return false;
if (tokenName == null) {
if (other.tokenName != null)
return false;
} else if (!tokenName.equals(other.tokenName))
return false;
return true;
}
@Override
public String toString() {
return "DLock(" + serviceName + ", " + tokenName + ")";
}
}
}