/*
* JBoss, Home of Professional Open Source
* Copyright 2011 Red Hat Inc. and/or its affiliates and other
* contributors as indicated by the @author tags. All rights reserved.
* See the copyright.txt in the distribution for a full listing of
* individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.infinispan.distexec;
import java.io.Externalizable;
import java.io.NotSerializableException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;
import java.util.Random;
import java.util.concurrent.AbstractExecutorService;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionService;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.RunnableFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.infinispan.AdvancedCache;
import org.infinispan.Cache;
import org.infinispan.commands.CommandsFactory;
import org.infinispan.commands.read.DistributedExecuteCommand;
import org.infinispan.distribution.DistributionManager;
import org.infinispan.factories.ComponentRegistry;
import org.infinispan.factories.GlobalComponentRegistry;
import org.infinispan.interceptors.InterceptorChain;
import org.infinispan.lifecycle.ComponentStatus;
import org.infinispan.marshall.Marshaller;
import org.infinispan.marshall.StreamingMarshaller;
import org.infinispan.remoting.responses.Response;
import org.infinispan.remoting.responses.SuccessfulResponse;
import org.infinispan.remoting.rpc.RpcManager;
import org.infinispan.remoting.transport.Address;
import org.infinispan.util.Util;
import org.infinispan.util.concurrent.FutureListener;
import org.infinispan.util.concurrent.NotifyingFuture;
import org.infinispan.util.concurrent.NotifyingNotifiableFuture;
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
/**
* Infinispan's implementation of an {@link ExecutorService} and {@link DistributedExecutorService}.
* This ExecutorService provides methods to submit tasks for an execution on a cluster of Infinispan
* nodes.
* <p>
*
*
* Note that due to potential task migration to another nodes every {@link Callable},
* {@link Runnable} and/or {@link DistributedCallable} submitted must be either {@link Serializable}
* or {@link Externalizable}. Also the value returned from a callable must be {@link Serializable}
* or {@link Externalizable}. Unfortunately if the value returned is not serializable then a
* {@link NotSerializableException} will be thrown.
*
* @author Vladimir Blagojevic
* @since 5.0
*
*/
public class DefaultExecutorService extends AbstractExecutorService implements DistributedExecutorService {
private static final Log log = LogFactory.getLog(DefaultExecutorService.class);
protected final AtomicBoolean isShutdown = new AtomicBoolean(false);
protected final AdvancedCache cache;
protected final RpcManager rpc;
protected final InterceptorChain invoker;
protected final CommandsFactory factory;
protected final Marshaller marshaller;
/**
* Create a new DefaultExecutorService given a master cache node. All distributed task executions
* will be initiated from this cache node.
*
* @param masterCacheNode
* cache node initiating map reduce task
*/
public DefaultExecutorService(Cache masterCacheNode) {
super();
if (masterCacheNode == null)
throw new NullPointerException("Can not use " + masterCacheNode
+ " cache for DefaultExecutorService");
ensureProperCacheState(masterCacheNode.getAdvancedCache());
this.cache = masterCacheNode.getAdvancedCache();
ComponentRegistry registry = cache.getComponentRegistry();
GlobalComponentRegistry globalRegistry = cache.getComponentRegistry().getGlobalComponentRegistry();
this.rpc = cache.getRpcManager();
this.invoker = registry.getComponent(InterceptorChain.class);
this.factory = registry.getComponent(CommandsFactory.class);
this.marshaller = globalRegistry.getComponent(StreamingMarshaller.class);
}
@Override
public <T> NotifyingFuture<T> submit(Runnable task, T result) {
return (NotifyingFuture<T>) super.submit(task, result);
}
@Override
public <T> NotifyingFuture<T> submit(Callable<T> task) {
return (NotifyingFuture<T>) super.submit(task);
}
@Override
public void shutdown() {
realShutdown(false);
}
@SuppressWarnings("unchecked")
private List<Runnable> realShutdown(boolean interrupt) {
isShutdown.set(true);
// TODO cancel all tasks
return Collections.emptyList();
}
@Override
public List<Runnable> shutdownNow() {
return realShutdown(true);
}
@Override
public boolean isShutdown() {
return isShutdown.get();
}
@Override
public boolean isTerminated() {
if (isShutdown.get()) {
// TODO account for all tasks
return true;
}
return false;
}
@Override
public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
long nanoTimeWait = unit.toNanos(timeout);
// TODO wait for all tasks to finish
return true;
}
public <T> T invokeAny(Collection<? extends Callable<T>> tasks) throws InterruptedException,
ExecutionException {
try {
return doInvokeAny(tasks, false, 0);
} catch (TimeoutException cannotHappen) {
assert false;
return null;
}
}
public <T> T invokeAny(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException, TimeoutException {
return doInvokeAny(tasks, true, unit.toNanos(timeout));
}
/**
* the main mechanics of invokeAny. This was essentially copied from
* {@link AbstractExecutorService} doInvokeAny except that we replaced the
* {@link ExecutorCompletionService} with our {@link DistributedExecutionCompletionService}.
*/
private <T> T doInvokeAny(Collection<? extends Callable<T>> tasks, boolean timed, long nanos)
throws InterruptedException, ExecutionException, TimeoutException {
if (tasks == null)
throw new NullPointerException();
int ntasks = tasks.size();
if (ntasks == 0)
throw new IllegalArgumentException();
List<Future<T>> futures = new ArrayList<Future<T>>(ntasks);
CompletionService<T> ecs = new DistributedExecutionCompletionService<T>(this);
// For efficiency, especially in executors with limited
// parallelism, check to see if previously submitted tasks are
// done before submitting more of them. This interleaving
// plus the exception mechanics account for messiness of main
// loop.
try {
// Record exceptions so that if we fail to obtain any
// result, we can throw the last exception we got.
ExecutionException ee = null;
long lastTime = (timed) ? System.nanoTime() : 0;
Iterator<? extends Callable<T>> it = tasks.iterator();
// Start one task for sure; the rest incrementally
futures.add(ecs.submit(it.next()));
--ntasks;
int active = 1;
for (;;) {
Future<T> f = ecs.poll();
if (f == null) {
if (ntasks > 0) {
--ntasks;
futures.add(ecs.submit(it.next()));
++active;
} else if (active == 0)
break;
else if (timed) {
f = ecs.poll(nanos, TimeUnit.NANOSECONDS);
if (f == null)
throw new TimeoutException();
long now = System.nanoTime();
nanos -= now - lastTime;
lastTime = now;
} else
f = ecs.take();
}
if (f != null) {
--active;
try {
return f.get();
} catch (InterruptedException ie) {
throw ie;
} catch (ExecutionException eex) {
ee = eex;
} catch (RuntimeException rex) {
ee = new ExecutionException(rex);
}
}
}
if (ee == null)
ee = new ExecutionException() {
private static final long serialVersionUID = 200818694545553992L;
};
throw ee;
} finally {
for (Future<T> f : futures)
f.cancel(true);
}
}
@Override
public void execute(Runnable command) {
if (!isShutdown.get()) {
DistributedRunnableFuture<Object> cmd = null;
if (command instanceof DistributedRunnableFuture<?>) {
cmd = (DistributedRunnableFuture<Object>) command;
} else if (command instanceof Serializable) {
cmd = (DistributedRunnableFuture<Object>) newTaskFor(command, null);
} else {
throw new IllegalArgumentException("Runnable command is not Serializable " + command);
}
executeFuture(selectExecutionNode(), cmd);
} else {
throw new RejectedExecutionException();
}
}
@Override
protected <T> RunnableFuture<T> newTaskFor(Runnable runnable, T value) {
if (runnable == null) throw new NullPointerException();
DistributedExecuteCommand<T> executeCommand = factory.buildDistributedExecuteCommand(
new RunnableAdapter<T>(runnable, value), rpc.getAddress(), null);
DistributedRunnableFuture<T> future = new DistributedRunnableFuture<T>(executeCommand);
return future;
}
@Override
protected <T> RunnableFuture<T> newTaskFor(Callable<T> callable) {
if (callable == null) throw new NullPointerException();
DistributedExecuteCommand<T> executeCommand = factory.buildDistributedExecuteCommand(
callable, rpc.getAddress(), null);
DistributedRunnableFuture<T> future = new DistributedRunnableFuture<T>(executeCommand);
return future;
}
@Override
public <T, K> Future<T> submit(Callable<T> task, K... input) {
if (task == null) throw new NullPointerException();
if(inputKeysSpecified(input)){
Map<Address, List<K>> nodesKeysMap = mapKeysToNodes(input);
Address me = rpc.getAddress();
DistributedExecuteCommand<T> c = factory.buildDistributedExecuteCommand(task, me, Arrays.asList(input));
DistributedRunnableFuture<T> f = new DistributedRunnableFuture<T>(c);
ArrayList<Address> nodes = new ArrayList<Address>(nodesKeysMap.keySet());
executeFuture(selectExecutionNode(nodes), f);
return f;
} else {
return submit(task);
}
}
@Override
public <T> List<Future<T>> submitEverywhere(Callable<T> task) {
if (task == null) throw new NullPointerException();
List<Future<T>> futures = new ArrayList<Future<T>>();
List<Address> members = rpc.getTransport().getMembers();
Address me = rpc.getAddress();
for (Address target : members) {
DistributedExecuteCommand<T> c = null;
if (target.equals(me)) {
c = factory.buildDistributedExecuteCommand(clone(task), me, null);
} else {
c = factory.buildDistributedExecuteCommand(task, me, null);
}
DistributedRunnableFuture<T> f = new DistributedRunnableFuture<T>(c);
futures.add(f);
executeFuture(target, f);
}
return futures;
}
@Override
public <T, K> List<Future<T>> submitEverywhere(Callable<T> task, K... input) {
if (task == null) throw new NullPointerException();
if(inputKeysSpecified(input)) {
List<Future<T>> futures = new ArrayList<Future<T>>();
Address me = rpc.getAddress();
Map<Address, List<K>> nodesKeysMap = mapKeysToNodes(input);
for (Entry<Address, List<K>> e : nodesKeysMap.entrySet()) {
Address target = e.getKey();
DistributedExecuteCommand<T> c = null;
if (target.equals(me)) {
c = factory.buildDistributedExecuteCommand(clone(task), me, e.getValue());
} else {
c = factory.buildDistributedExecuteCommand(task, me, e.getValue());
}
DistributedRunnableFuture<T> f = new DistributedRunnableFuture<T>(c);
futures.add(f);
executeFuture(target, f);
}
return futures;
} else {
return submitEverywhere(task);
}
}
protected <T> Callable<T> clone(Callable<T> task){
return Util.cloneWithMarshaller(marshaller, task);
}
protected <T> void executeFuture(Address address, DistributedRunnableFuture<T> f) {
if (rpc.getAddress().equals(address)) {
invokeLocally(f);
} else {
log.debugf("Sending %s to remote execution at node %s", f, address);
try {
rpc.invokeRemotelyInFuture(Collections.singletonList(address), f.getCommand(),
(DistributedRunnableFuture<Object>) f);
} catch (Throwable e) {
log.remoteExecutionFailed(address, e);
}
}
}
private <K> boolean inputKeysSpecified(K...input){
return input != null && input.length > 0;
}
protected <T> void invokeLocally(final DistributedRunnableFuture<T> future) {
log.debugf("Sending %s to self", future);
try {
Callable<Object> call = new Callable<Object>() {
@Override
public Object call() throws Exception {
Map<Address,Response> rspMap = new HashMap<Address, Response>();
Object result = null;
future.getCommand().init(cache);
try {
result = future.getCommand().perform(null);
rspMap.put(rpc.getAddress(), new SuccessfulResponse(result));
result = rspMap;
} catch (Throwable e) {
result = e;
} finally {
future.notifyDone();
}
return result;
}
};
final FutureTask<Object> task = new FutureTask<Object>(call);
future.setNetworkFuture((Future<T>) task);
task.run();
} catch (Throwable e1) {
log.localExecutionFailed(e1);
}
}
protected <K> Map<Address, List<K>> mapKeysToNodes(K... input) {
DistributionManager dm = cache.getDistributionManager();
Map<Address, List<K>> addressToKey = new HashMap<Address, List<K>>();
for (K key : input) {
List<Address> nodesForKey = dm.locate(key);
Address ownerOfKey = nodesForKey.get(0);
List<K> keysAtNode = addressToKey.get(ownerOfKey);
if (keysAtNode == null) {
keysAtNode = new ArrayList<K>();
addressToKey.put(ownerOfKey, keysAtNode);
}
keysAtNode.add(key);
}
return addressToKey;
}
protected Address selectExecutionNode(List<Address> candidates) {
List<Address> list = randomClusterMembers(candidates,1);
return list.get(0);
}
protected Address selectExecutionNode() {
return selectExecutionNode(rpc.getTransport().getMembers());
}
protected List<Address> randomClusterMembers(final List<Address> members, int numNeeded) {
if(members == null || members.isEmpty())
throw new IllegalArgumentException("Invalid member list " + members);
if (members.size() < numNeeded) {
log.cannotSelectRandomMembers(numNeeded, members);
numNeeded = members.size();
}
List<Address> membersCopy = new ArrayList<Address>(members);
List<Address> chosen = new ArrayList<Address>();
Random r = new Random();
while (!membersCopy.isEmpty() && numNeeded >= chosen.size()) {
int count = membersCopy.size();
Address address = membersCopy.remove(r.nextInt(count));
chosen.add(address);
}
return chosen;
}
private void ensureProperCacheState(AdvancedCache cache) throws NullPointerException,
IllegalStateException {
if (cache.getRpcManager() == null)
throw new IllegalStateException("Can not use non-clustered cache for DefaultExecutorService");
if (cache.getStatus() != ComponentStatus.RUNNING)
throw new IllegalStateException("Invalid cache state " + cache.getStatus());
}
/**
* DistributedRunnableFuture is essentially a Future wrap around DistributedExecuteCommand.
*
*
* @author Mircea Markus
* @author Vladimir Blagojevic
*/
private static class DistributedRunnableFuture<V> implements RunnableFuture<V>, NotifyingNotifiableFuture<V> {
private final DistributedExecuteCommand<V> distCommand;
private volatile Future<V> f;
//TODO revisit if volatile needed
private volatile boolean callCompleted = false;
private final Set<FutureListener<V>> listeners = new CopyOnWriteArraySet<FutureListener<V>>();
private final ReadWriteLock listenerLock = new ReentrantReadWriteLock();
/**
* Creates a <tt>DistributedRunnableFuture</tt> that will upon running, execute the given
* <tt>Runnable</tt>, and arrange that <tt>get</tt> will return the given result on successful
* completion.
*
*
* @param runnable
* the runnable task
* @param result
* the result to return on successful completion.
*
*/
public DistributedRunnableFuture(DistributedExecuteCommand<V> command) {
this.distCommand = command;
}
public DistributedExecuteCommand<V> getCommand() {
return distCommand;
}
public boolean isCancelled() {
return f.isCancelled();
}
public boolean isDone() {
return f.isDone();
}
public boolean cancel(boolean mayInterruptIfRunning) {
return f.cancel(mayInterruptIfRunning);
}
/**
*
*/
public V get() throws InterruptedException, ExecutionException {
Object response = f.get();
return retrieveResult(response);
}
/**
*
*/
public V get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException,
TimeoutException {
Object response = f.get(timeout, unit);
return retrieveResult(response);
}
@Override
public void run() {
}
public void notifyDone() {
listenerLock.writeLock().lock();
try {
callCompleted = true;
for (FutureListener<V> l : listeners) l.futureDone(this);
} finally {
listenerLock.writeLock().unlock();
}
}
public NotifyingFuture<V> attachListener(FutureListener<V> listener) {
listenerLock.readLock().lock();
try {
if (!callCompleted) listeners.add(listener);
if (callCompleted) listener.futureDone(this);
return this;
} finally {
listenerLock.readLock().unlock();
}
}
@Override
public void setNetworkFuture(Future<V> future) {
this.f = future;
}
private V retrieveResult(Object response) throws ExecutionException {
if (response instanceof Exception) {
throw new ExecutionException((Exception) response);
}
Map<Address, Response> mapResult = (Map<Address, Response>) response;
for (Entry<Address, Response> e : mapResult.entrySet()) {
if (e.getValue() instanceof SuccessfulResponse) {
return (V) ((SuccessfulResponse) e.getValue()).getResponseValue();
}
}
throw new ExecutionException(new IllegalStateException("Invalid response " + response));
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof DistributedRunnableFuture)) {
return false;
}
DistributedRunnableFuture<?> that = (DistributedRunnableFuture<?>) o;
return that.getCommand().equals(getCommand());
}
@Override
public int hashCode() {
return getCommand().hashCode();
}
}
private static final class RunnableAdapter<T> implements Callable<T>, Serializable {
/** The serialVersionUID */
private static final long serialVersionUID = 6629286923873531028L;
protected Runnable task;
protected T result;
protected RunnableAdapter() {
}
protected RunnableAdapter(Runnable task, T result) {
this.task = task;
this.result = result;
}
public T call() {
task.run();
return result;
}
}
}