2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2017-2021 AT&T Intellectual Property. All rights reserved.
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
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18 * ============LICENSE_END=========================================================
21 package org.onap.policy.controlloop.eventmanager;
23 import java.io.Serializable;
24 import java.time.Instant;
25 import java.util.Deque;
26 import java.util.HashMap;
28 import java.util.UUID;
29 import java.util.concurrent.CompletableFuture;
30 import java.util.concurrent.ConcurrentHashMap;
31 import java.util.concurrent.ConcurrentLinkedDeque;
32 import java.util.concurrent.Executor;
33 import java.util.concurrent.ExecutorService;
34 import java.util.concurrent.ForkJoinPool;
35 import java.util.concurrent.TimeUnit;
36 import java.util.concurrent.atomic.AtomicLong;
37 import lombok.AccessLevel;
39 import lombok.ToString;
40 import org.onap.policy.controlloop.ControlLoopException;
41 import org.onap.policy.controlloop.ControlLoopOperation;
42 import org.onap.policy.controlloop.actorserviceprovider.ActorService;
43 import org.onap.policy.controlloop.actorserviceprovider.OperationOutcome;
44 import org.onap.policy.controlloop.actorserviceprovider.OperationResult;
45 import org.onap.policy.controlloop.drl.legacy.ControlLoopParams;
46 import org.onap.policy.controlloop.ophistory.OperationHistoryDataManager;
47 import org.onap.policy.controlloop.ophistory.OperationHistoryDataManagerStub;
48 import org.onap.policy.controlloop.processor.ControlLoopProcessor;
49 import org.onap.policy.drools.core.lock.LockCallback;
50 import org.onap.policy.drools.system.PolicyEngineConstants;
51 import org.slf4j.Logger;
52 import org.slf4j.LoggerFactory;
55 * Manager for a single event. Once this has been created, the event can be retracted from
56 * working memory. Invoke {@link #isActive()} to determine if the manager is active (i.e.,
57 * hasn't been replicated from another server). When the manager is no longer needed,
58 * {@link #destroy()} should be invoked.
60 @ToString(onlyExplicitlyIncluded = true)
61 public class ControlLoopEventManager implements StepContext, Serializable {
63 private static final Logger logger = LoggerFactory.getLogger(ControlLoopEventManager.class);
64 private static final long serialVersionUID = -1216568161322872641L;
67 * Data manager used when the policy engine's guard.disabled property is "true".
69 private static final OperationHistoryDataManager STUB_DATA_MANAGER = new OperationHistoryDataManagerStub();
71 private static final String GUARD_DISABLED_PROPERTY = "guard.disabled";
74 * Counts the number of these objects that have been created. This is used by junit
77 private static final AtomicLong createCount = new AtomicLong(0);
80 * {@code True} if this object was created by this JVM instance, {@code false}
81 * otherwise. This will be {@code false} if this object is reconstituted from a
82 * persistent store or by transfer from another server.
84 private transient boolean createdByThisJvmInstance;
86 private final transient EventManagerServices services;
90 public final String closedLoopControlName;
93 private final UUID requestId;
96 * Time, in milliseconds, when the control loop will time out.
99 private final long endTimeMs;
101 // fields extracted from the ControlLoopParams
103 private final String policyName;
105 private final String policyVersion;
108 * Maps a target entity to its lock.
110 private final transient Map<String, LockData> target2lock = new HashMap<>();
112 @Getter(AccessLevel.PROTECTED)
113 private final ControlLoopProcessor processor;
116 * Set of properties used while processing the event.
118 private Map<String, Serializable> properties = new ConcurrentHashMap<>();
121 * Unprocessed outcomes from the operations. Outcomes are added to this each time the
122 * "start" or "complete" callback is invoked, typically by an operation running in a
123 * background thread, thus it must be thread safe.
126 private final transient Deque<OperationOutcome> outcomes = new ConcurrentLinkedDeque<>();
130 * Constructs the object.
132 * @param services services the manager should use when processing the event
133 * @param params control loop parameters
134 * @param requestId event request ID
135 * @throws ControlLoopException if the event is invalid or if a YAML processor cannot
138 public ControlLoopEventManager(EventManagerServices services, ControlLoopParams params, UUID requestId)
139 throws ControlLoopException {
141 createCount.incrementAndGet();
143 this.createdByThisJvmInstance = true;
144 this.services = services;
145 this.closedLoopControlName = params.getClosedLoopControlName();
146 this.requestId = requestId;
147 this.policyName = params.getPolicyName();
148 this.policyVersion = params.getPolicyVersion();
149 this.processor = new ControlLoopProcessor(params.getToscaPolicy());
150 this.endTimeMs = System.currentTimeMillis() + detmControlLoopTimeoutMs();
154 * Gets the number of manager objects that have been created.
156 * @return the number of manager objects that have been created
158 public static long getCreateCount() {
159 return createCount.get();
163 * Determines if the manager is still active.
165 * @return {@code true} if the manager is still active, {@code false} otherwise
167 public boolean isActive() {
168 return createdByThisJvmInstance;
172 * Cancels the current operation and frees all locks.
174 public void destroy() {
176 getBlockingExecutor().execute(this::freeAllLocks);
183 private void freeAllLocks() {
184 target2lock.values().forEach(LockData::free);
188 * Determines the overall control loop timeout.
190 * @return the policy timeout, in milliseconds, if specified, a default timeout
193 private long detmControlLoopTimeoutMs() {
194 // validation checks preclude null or 0 timeout values in the policy
195 Integer timeout = processor.getPolicy().getProperties().getTimeout();
196 return TimeUnit.MILLISECONDS.convert(timeout, TimeUnit.SECONDS);
200 public synchronized CompletableFuture<OperationOutcome> requestLock(String targetEntity) {
202 long remainingMs = endTimeMs - System.currentTimeMillis();
203 int remainingSec = 15 + Math.max(0, (int) TimeUnit.SECONDS.convert(remainingMs, TimeUnit.MILLISECONDS));
205 LockData data = target2lock.computeIfAbsent(targetEntity, key -> {
206 var data2 = new LockData(key, requestId);
207 makeLock(targetEntity, requestId.toString(), remainingSec, data2);
209 data2.addUnavailableCallback(this::onComplete);
214 return data.getFuture();
218 public synchronized CompletableFuture<OperationOutcome> releaseLock(String targetEntity) {
219 LockData data = target2lock.remove(targetEntity);
222 // lock did not exist - immediately return a success
223 OperationOutcome outcome = makeUnlockOutcome(targetEntity);
224 outcome.setEnd(outcome.getStart());
227 return CompletableFuture.completedFuture(outcome);
231 * previous lock operation may not have completed yet, thus we tack the unlock
234 * Note: we must invoke free(), asynchronously (i.e., using whenCompleteAsync()),
238 return data.getFuture().whenCompleteAsync((lockOutcome, thrown) -> {
240 OperationOutcome outcome = makeUnlockOutcome(targetEntity);
245 } catch (RuntimeException e) {
246 logger.warn("failed to unlock {}", targetEntity, e);
247 outcome.setResult(OperationResult.FAILURE_EXCEPTION);
248 outcome.setMessage(ControlLoopOperation.FAILED_MSG + ": " + e.getMessage());
251 outcome.setEnd(Instant.now());
254 }, getBlockingExecutor());
257 private OperationOutcome makeUnlockOutcome(String targetEntity) {
258 var outcome = new OperationOutcome();
259 outcome.setActor(ActorConstants.LOCK_ACTOR);
260 outcome.setOperation(ActorConstants.UNLOCK_OPERATION);
261 outcome.setTarget(targetEntity);
262 outcome.setResult(OperationResult.SUCCESS);
263 outcome.setMessage(ControlLoopOperation.SUCCESS_MSG);
264 outcome.setFinalOutcome(true);
265 outcome.setStart(Instant.now());
269 public void onStart(OperationOutcome outcome) {
270 outcomes.add(outcome);
273 public void onComplete(OperationOutcome outcome) {
274 outcomes.add(outcome);
278 * Determines if the context contains a property.
280 * @param name name of the property of interest
281 * @return {@code true} if the context contains the property, {@code false} otherwise
284 public boolean contains(String name) {
285 return properties.containsKey(name);
289 * Gets a property, casting it to the desired type.
291 * @param <T> desired type
292 * @param name name of the property whose value is to be retrieved
293 * @return the property's value, or {@code null} if it does not yet have a value
296 @SuppressWarnings("unchecked")
297 public <T> T getProperty(String name) {
298 return (T) properties.get(name);
302 * Sets a property's value.
304 * @param name property name
305 * @param value new property value
308 public void setProperty(String name, Serializable value) {
309 logger.info("set property {}={} manager={}", name, value, this);
310 properties.put(name, value);
314 * Removes a property.
316 * @param name property name
319 public void removeProperty(String name) {
320 properties.remove(name);
323 // the following methods may be overridden by junit tests
325 public Executor getExecutor() {
326 return ForkJoinPool.commonPool();
329 protected ExecutorService getBlockingExecutor() {
330 return PolicyEngineConstants.getManager().getExecutorService();
333 protected void makeLock(String targetEntity, String requestId, int holdSec, LockCallback callback) {
334 PolicyEngineConstants.getManager().createLock(targetEntity, requestId, holdSec, callback, false);
337 public ActorService getActorService() {
338 return services.getActorService();
341 public OperationHistoryDataManager getDataManager() {
342 boolean guardDisabled = "true".equalsIgnoreCase(getEnvironmentProperty(GUARD_DISABLED_PROPERTY));
343 return (guardDisabled ? STUB_DATA_MANAGER : services.getDataManager());
346 protected String getEnvironmentProperty(String propName) {
347 return PolicyEngineConstants.getManager().getEnvironmentProperty(propName);