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
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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";
72 private static final String EVENT_MANAGER_SERVICE_CONFIG = "event-manager";
75 * Counts the number of these objects that have been created. This is used by junit
78 private static final AtomicLong createCount = new AtomicLong(0);
81 * {@code True} if this object was created by this JVM instance, {@code false}
82 * otherwise. This will be {@code false} if this object is reconstituted from a
83 * persistent store or by transfer from another server.
85 private transient boolean createdByThisJvmInstance;
89 public final String closedLoopControlName;
92 private final UUID requestId;
95 * Time, in milliseconds, when the control loop will time out.
98 private final long endTimeMs;
100 // fields extracted from the ControlLoopParams
102 private final String policyName;
104 private final String policyVersion;
107 * Maps a target entity to its lock.
109 private final transient Map<String, LockData> target2lock = new HashMap<>();
111 @Getter(AccessLevel.PROTECTED)
112 private final ControlLoopProcessor processor;
115 * Set of properties used while processing the event.
117 private Map<String, Serializable> properties = new ConcurrentHashMap<>();
120 * Unprocessed outcomes from the operations. Outcomes are added to this each time the
121 * "start" or "complete" callback is invoked, typically by an operation running in a
122 * background thread, thus it must be thread safe.
125 private final transient Deque<OperationOutcome> outcomes = new ConcurrentLinkedDeque<>();
129 * Constructs the object.
131 * @param params control loop parameters
132 * @param requestId event request ID
133 * @throws ControlLoopException if the event is invalid or if a YAML processor cannot
136 public ControlLoopEventManager(ControlLoopParams params, UUID requestId) throws ControlLoopException {
138 createCount.incrementAndGet();
140 this.createdByThisJvmInstance = true;
141 this.closedLoopControlName = params.getClosedLoopControlName();
142 this.requestId = requestId;
143 this.policyName = params.getPolicyName();
144 this.policyVersion = params.getPolicyVersion();
145 this.processor = new ControlLoopProcessor(params.getToscaPolicy());
146 this.endTimeMs = System.currentTimeMillis() + detmControlLoopTimeoutMs();
150 * Gets the number of manager objects that have been created.
152 * @return the number of manager objects that have been created
154 public static long getCreateCount() {
155 return createCount.get();
159 * Determines if the manager is still active.
161 * @return {@code true} if the manager is still active, {@code false} otherwise
163 public boolean isActive() {
164 return createdByThisJvmInstance;
168 * Cancels the current operation and frees all locks.
170 public void destroy() {
172 getBlockingExecutor().execute(this::freeAllLocks);
179 private void freeAllLocks() {
180 target2lock.values().forEach(LockData::free);
184 * Determines the overall control loop timeout.
186 * @return the policy timeout, in milliseconds, if specified, a default timeout
189 private long detmControlLoopTimeoutMs() {
190 // validation checks preclude null or 0 timeout values in the policy
191 Integer timeout = processor.getPolicy().getProperties().getTimeout();
192 return TimeUnit.MILLISECONDS.convert(timeout, TimeUnit.SECONDS);
196 public synchronized CompletableFuture<OperationOutcome> requestLock(String targetEntity) {
198 long remainingMs = endTimeMs - System.currentTimeMillis();
199 int remainingSec = 15 + Math.max(0, (int) TimeUnit.SECONDS.convert(remainingMs, TimeUnit.MILLISECONDS));
201 LockData data = target2lock.computeIfAbsent(targetEntity, key -> {
202 LockData data2 = new LockData(key, requestId);
203 makeLock(targetEntity, requestId.toString(), remainingSec, data2);
205 data2.addUnavailableCallback(this::onComplete);
210 return data.getFuture();
214 public synchronized CompletableFuture<OperationOutcome> releaseLock(String targetEntity) {
215 LockData data = target2lock.remove(targetEntity);
218 // lock did not exist - immediately return a success
219 OperationOutcome outcome = makeUnlockOutcome(targetEntity);
220 outcome.setEnd(outcome.getStart());
223 return CompletableFuture.completedFuture(outcome);
227 * previous lock operation may not have completed yet, thus we tack the unlock
230 * Note: we must invoke free(), asynchronously (i.e., using whenCompleteAsync()),
234 return data.getFuture().whenCompleteAsync((lockOutcome, thrown) -> {
236 OperationOutcome outcome = makeUnlockOutcome(targetEntity);
241 } catch (RuntimeException e) {
242 logger.warn("failed to unlock {}", targetEntity, e);
243 outcome.setResult(OperationResult.FAILURE_EXCEPTION);
244 outcome.setMessage(ControlLoopOperation.FAILED_MSG + ": " + e.getMessage());
247 outcome.setEnd(Instant.now());
250 }, getBlockingExecutor());
253 private OperationOutcome makeUnlockOutcome(String targetEntity) {
254 OperationOutcome outcome = new OperationOutcome();
255 outcome.setActor(ActorConstants.LOCK_ACTOR);
256 outcome.setOperation(ActorConstants.UNLOCK_OPERATION);
257 outcome.setTarget(targetEntity);
258 outcome.setResult(OperationResult.SUCCESS);
259 outcome.setMessage(ControlLoopOperation.SUCCESS_MSG);
260 outcome.setFinalOutcome(true);
261 outcome.setStart(Instant.now());
265 public void onStart(OperationOutcome outcome) {
266 outcomes.add(outcome);
269 public void onComplete(OperationOutcome outcome) {
270 outcomes.add(outcome);
274 * Determines if the context contains a property.
276 * @param name name of the property of interest
277 * @return {@code true} if the context contains the property, {@code false} otherwise
280 public boolean contains(String name) {
281 return properties.containsKey(name);
285 * Gets a property, casting it to the desired type.
287 * @param <T> desired type
288 * @param name name of the property whose value is to be retrieved
289 * @return the property's value, or {@code null} if it does not yet have a value
292 @SuppressWarnings("unchecked")
293 public <T> T getProperty(String name) {
294 return (T) properties.get(name);
298 * Sets a property's value.
300 * @param name property name
301 * @param value new property value
304 public void setProperty(String name, Serializable value) {
305 logger.info("set property {}={} manager={}", name, value, this);
306 properties.put(name, value);
310 * Removes a property.
312 * @param name property name
315 public void removeProperty(String name) {
316 properties.remove(name);
320 * Initializes various components, on demand.
322 private static class LazyInitData {
323 private static final OperationHistoryDataManager DATA_MANAGER;
324 private static final ActorService ACTOR_SERVICE;
327 EventManagerServices services = new EventManagerServices(EVENT_MANAGER_SERVICE_CONFIG);
328 ACTOR_SERVICE = services.getActorService();
329 DATA_MANAGER = services.getDataManager();
333 // the following methods may be overridden by junit tests
335 public Executor getExecutor() {
336 return ForkJoinPool.commonPool();
339 protected ExecutorService getBlockingExecutor() {
340 return PolicyEngineConstants.getManager().getExecutorService();
343 protected void makeLock(String targetEntity, String requestId, int holdSec, LockCallback callback) {
344 PolicyEngineConstants.getManager().createLock(targetEntity, requestId, holdSec, callback, false);
347 public ActorService getActorService() {
348 return LazyInitData.ACTOR_SERVICE;
351 public OperationHistoryDataManager getDataManager() {
352 boolean guardDisabled = "true".equalsIgnoreCase(getEnvironmentProperty(GUARD_DISABLED_PROPERTY));
353 return (guardDisabled ? STUB_DATA_MANAGER : LazyInitData.DATA_MANAGER);
356 protected String getEnvironmentProperty(String propName) {
357 return PolicyEngineConstants.getManager().getEnvironmentProperty(propName);