1 /*
2 * Copyright (C) 2012-2025 RRiBbit.org
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.rribbit.execution;
17
18 import java.util.Collection;
19 import java.util.Collections;
20 import java.util.stream.Collectors;
21
22 import org.rribbit.ListenerObject;
23 import org.slf4j.Logger;
24 import org.slf4j.LoggerFactory;
25
26 /**
27 * This {@link AbstractListenerObjectExecutor} executes the {@link ListenerObject}s in parallel {@link Thread}s. If there is only one {@link ListenerObject} to be executed, then
28 * it will be executed in the calling {@link Thread} and no new {@link Thread} will be created.
29 *
30 * Please note that spawning new {@link Thread}s to execute the {@link ListenerObject}s will result in the loss of the transaction context. If the transaction context must be preserved,
31 * either make sure that only a single {@link ListenerObject} is executed or consider using the {@link SequentialListenerObjectExecutor}.
32 *
33 * @author G.J. Schouten
34 *
35 */
36 public class MultiThreadedListenerObjectExecutor extends AbstractListenerObjectExecutor {
37
38 private static final Logger log = LoggerFactory.getLogger(MultiThreadedListenerObjectExecutor.class);
39
40 @Override
41 protected Collection<ExecutionResult> doExecuteListeners(Collection<ListenerObject> listenerObjects, Object... parameters) {
42
43 if(listenerObjects.isEmpty()) {
44 log.debug("No ListenerObjects to process");
45 return Collections.emptyList();
46 } else if(listenerObjects.size() == 1) { //There is only one, don't spawn a new Thread, but do it in this Thread
47 log.debug("There is only one ListenerObject, not creating new Thread, executing it in this Thread");
48 return Collections.singletonList(this.executeSingleListenerObject(listenerObjects.iterator().next(), parameters));
49 }
50
51 log.debug("Creating Threads for each ListenerObject and executing");
52 return listenerObjects
53 .stream()
54 .parallel()
55 .map(listenerObject -> this.executeSingleListenerObject(listenerObject, parameters))
56 .collect(Collectors.toList());
57 }
58 }