2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2017-2018, 2020 AT&T Intellectual Property. All rights reserved.
6 * Modifications Copyright (C) 2019 Nordix Foundation.
7 * ================================================================================
8 * Licensed under the Apache License, Version 2.0 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
12 * http://www.apache.org/licenses/LICENSE-2.0
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 * ============LICENSE_END=========================================================
22 package org.onap.policy.controlloop.actorserviceprovider;
24 import com.google.common.collect.ImmutableMap;
25 import java.util.Collection;
26 import java.util.HashMap;
28 import java.util.ServiceLoader;
30 import org.onap.policy.common.parameters.BeanValidationResult;
31 import org.onap.policy.controlloop.actorserviceprovider.impl.StartConfigPartial;
32 import org.onap.policy.controlloop.actorserviceprovider.parameters.ParameterValidationRuntimeException;
33 import org.onap.policy.controlloop.actorserviceprovider.spi.Actor;
34 import org.slf4j.Logger;
35 import org.slf4j.LoggerFactory;
38 * Service that manages a set of actors. To use the service, first invoke
39 * {@link #configure(Map)} to configure all of the actors, and then invoke
40 * {@link #start()} to start all of the actors. When finished using the actor service,
41 * invoke {@link #stop()} or {@link #shutdown()}.
43 public class ActorService extends StartConfigPartial<Map<String, Map<String, Object>>> {
44 private static final Logger logger = LoggerFactory.getLogger(ActorService.class);
46 private final Map<String, Actor> name2actor;
48 private static class LazyHolder {
49 static final ActorService INSTANCE = new ActorService();
53 * Constructs the object and loads the list of actors.
55 protected ActorService() {
58 Map<String, Actor> map = new HashMap<>();
60 for (Actor newActor : loadActors()) {
61 map.compute(newActor.getName(), (name, existingActor) -> {
62 if (existingActor == null) {
66 logger.warn("duplicate actor names for {}: {}, ignoring {}", name,
67 existingActor.getClass().getSimpleName(), newActor.getClass().getSimpleName());
72 name2actor = ImmutableMap.copyOf(map);
76 * Get the single instance.
78 * @return the instance
80 public static ActorService getInstance() {
81 return LazyHolder.INSTANCE;
85 * Gets a particular actor.
87 * @param name name of the actor of interest
88 * @return the desired actor
89 * @throws IllegalArgumentException if no actor by the given name exists
91 public Actor getActor(String name) {
92 Actor actor = name2actor.get(name);
94 throw new IllegalArgumentException("unknown actor " + name);
105 public Collection<Actor> getActors() {
106 return name2actor.values();
110 * Gets the names of the actors.
112 * @return the actor names
114 public Set<String> getActorNames() {
115 return name2actor.keySet();
119 protected void doConfigure(Map<String, Map<String, Object>> parameters) {
120 logger.info("configuring actors");
122 BeanValidationResult valres = new BeanValidationResult("ActorService", parameters);
124 for (Actor actor : name2actor.values()) {
125 String actorName = actor.getName();
126 Map<String, Object> subparams = parameters.get(actorName);
128 if (subparams != null) {
131 actor.configure(subparams);
133 } catch (ParameterValidationRuntimeException e) {
134 logger.warn("failed to configure actor {}", actorName, e);
135 valres.addResult(e.getResult());
137 } catch (RuntimeException e) {
138 logger.warn("failed to configure actor {}", actorName, e);
141 } else if (actor.isConfigured()) {
142 logger.warn("missing configuration parameters for actor {}; using previous parameters", actorName);
145 logger.warn("missing configuration parameters for actor {}; actor cannot be started", actorName);
149 if (!valres.isValid() && logger.isWarnEnabled()) {
150 logger.warn("actor services validation errors:\n{}", valres.getResult());
155 protected void doStart() {
156 logger.info("starting actors");
158 for (Actor actor : name2actor.values()) {
159 if (actor.isConfigured()) {
160 Util.runFunction(actor::start, "failed to start actor {}", actor.getName());
163 logger.warn("not starting unconfigured actor {}", actor.getName());
169 protected void doStop() {
170 logger.info("stopping actors");
172 .forEach(actor -> Util.runFunction(actor::stop, "failed to stop actor {}", actor.getName()));
176 protected void doShutdown() {
177 logger.info("shutting down actors");
180 name2actor.values().forEach(
181 actor -> Util.runFunction(actor::shutdown, "failed to shutdown actor {}", actor.getName()));
186 // the following methods may be overridden by junit tests
188 protected Iterable<Actor> loadActors() {
189 return ServiceLoader.load(Actor.class);