package org.infinispan.commands.read;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletableFuture;
import org.infinispan.Cache;
import org.infinispan.commands.CancellableCommand;
import org.infinispan.commands.VisitableCommand;
import org.infinispan.commands.Visitor;
import org.infinispan.commands.remote.BaseRpcCommand;
import org.infinispan.commons.marshall.MarshallUtil;
import org.infinispan.context.InvocationContext;
import org.infinispan.distexec.DistributedCallable;
import org.infinispan.distexec.spi.DistributedTaskLifecycleService;
import org.infinispan.util.ByteString;
/**
* DistributedExecuteCommand is used to migrate Callable and execute it in remote JVM.
*
* @author Vladimir Blagojevic
* @author Mircea Markus
* @since 5.0
*/
public class DistributedExecuteCommand<V> extends BaseRpcCommand implements VisitableCommand, CancellableCommand{
public static final int COMMAND_ID = 19;
private static final long serialVersionUID = -7828117401763700385L;
private Cache<Object, Object> cache;
private Set<Object> keys;
private Callable<V> callable;
private UUID uuid;
public DistributedExecuteCommand(ByteString cacheName) {
this(cacheName, null, null);
}
public DistributedExecuteCommand(ByteString cacheName, Collection<Object> inputKeys, Callable<V> callable) {
super(cacheName);
if (inputKeys == null || inputKeys.isEmpty())
this.keys = Collections.emptySet();
else
this.keys = new HashSet<Object>(inputKeys);
this.callable = callable;
this.uuid = UUID.randomUUID();
}
public DistributedExecuteCommand() {
this(null, null, null);
}
public void init(Cache<Object, Object> cache) {
this.cache = cache;
}
@Override
public Object acceptVisitor(InvocationContext ctx, Visitor visitor) throws Throwable {
return visitor.visitDistributedExecuteCommand(ctx, this);
}
@Override
public LoadType loadType() {
throw new UnsupportedOperationException();
}
@Override
public Object perform(InvocationContext ctx) throws Throwable {
throw new UnsupportedOperationException();
}
/**
* Performs invocation of Callable and returns result
*/
@Override
public CompletableFuture<Object> invokeAsync() throws Exception {
// hook into lifecycle
DistributedTaskLifecycleService taskLifecycleService = DistributedTaskLifecycleService.getInstance();
Callable<V> callable = getCallable();
V result = null;
try {
taskLifecycleService.onPreExecute(callable, cache, Collections.unmodifiableCollection(keys));
if (callable instanceof DistributedCallable<?, ?, ?>) {
DistributedCallable<Object, Object, Object> dc = (DistributedCallable<Object, Object, Object>) callable;
dc.setEnvironment(cache, keys);
}
result = callable.call();
} finally {
taskLifecycleService.onPostExecute(callable);
}
return CompletableFuture.completedFuture(result);
}
public Callable<V> getCallable() {
return callable;
}
public Set<Object> getKeys(){
return keys;
}
public boolean hasKeys(){
return keys.isEmpty();
}
@Override
public byte getCommandId() {
return COMMAND_ID;
}
@Override
public UUID getUUID() {
return uuid;
}
@Override
public void writeTo(ObjectOutput output) throws IOException {
MarshallUtil.marshallCollection(keys, output);
output.writeObject(callable);
MarshallUtil.marshallUUID(uuid, output, false);
}
@Override
public void readFrom(ObjectInput input) throws IOException, ClassNotFoundException {
keys = MarshallUtil.unmarshallCollectionUnbounded(input, HashSet::new);
callable = (Callable<V>) input.readObject();
uuid = MarshallUtil.unmarshallUUID(input, false);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((keys == null) ? 0 : keys.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (!(obj instanceof DistributedExecuteCommand)) {
return false;
}
DistributedExecuteCommand other = (DistributedExecuteCommand) obj;
if (keys == null) {
if (other.keys != null) {
return false;
}
} else if (!keys.equals(other.keys)) {
return false;
}
return true;
}
@Override
public String toString() {
return "DistributedExecuteCommand [cache=" + cache + ", keys=" + keys + ", callable="
+ callable + "]";
}
@Override
public boolean isReturnValueExpected() {
return true;
}
@Override
public boolean canBlock() {
return true;
}
}