2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
6 * ================================================================================
7 * Copyright (C) 2017 Amdocs
8 * =============================================================================
9 * Licensed under the Apache License, Version 2.0 (the "License");
10 * you may not use this file except in compliance with the License.
11 * You may obtain a copy of the License at
13 * http://www.apache.org/licenses/LICENSE-2.0
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
21 * ECOMP is a trademark and service mark of AT&T Intellectual Property.
22 * ============LICENSE_END=========================================================
25 package org.openecomp.appc.workflow.impl;
27 import java.util.concurrent.locks.ReentrantLock;
29 import org.openecomp.appc.rankingframework.RankedAttributesContext;
30 import org.openecomp.appc.rankingframework.RankedAttributesResolver;
31 import com.att.eelf.configuration.EELFLogger;
32 import com.att.eelf.configuration.EELFManager;
34 class WorkflowResolver {
36 private static final EELFLogger logger = EELFManager.getInstance().getLogger(WorkFlowManagerImpl.class);
38 private long interval;
40 private volatile long lastUpdate = 0l;
41 private volatile boolean isUpdateInProgress = false;
42 private volatile RankedAttributesResolver<WorkflowKey> dgResolver;
44 private final ReentrantLock INIT_LOCK = new ReentrantLock();
46 WorkflowResolver(long interval) {
47 this.interval = interval * 1000;
50 private RankedAttributesResolver<WorkflowKey> createResolver() {
51 WorkflowResolverDataReader reader = new WorkflowResolverDataReader();
55 private boolean isExpired() {
56 return (System.currentTimeMillis() - lastUpdate) > interval;
59 private RankedAttributesResolver<WorkflowKey> resolver() {
62 * In general case, the method implementation is non-blocking. The first
63 * thread that identifies data expiration will be used to refresh it. In
64 * meanwhile, any other thread will get the old instance without waiting
65 * for the updated one. The only exception is the very first time when
66 * previous instance doesn't exist - in such a cases all the threads
67 * will be waiting on INIT_LOCK while one of them initializes the
68 * resolver instance. NOTE: The initialization is intentionally
69 * implemented in lazy manner to make sure the bundle is initialized
70 * properly on startup regardless whether or not the data is correct.
71 * Afterwards, the resolver may be instantiated as many times as needed.
76 if (dgResolver == null) {
78 if (dgResolver != null) {
83 if (!isUpdateInProgress && isExpired()) {
85 boolean doUpgrade = false;
88 if (!isUpdateInProgress) {
89 isUpdateInProgress = true;
96 logger.info("DG resolver configuration data has expired - initiating refresh");
99 RankedAttributesResolver<WorkflowKey> temp = createResolver();
101 lastUpdate = System.currentTimeMillis();
103 logger.info("DG resolver configuration data has been refreshed successfully");
105 isUpdateInProgress = false;
110 if (INIT_LOCK.isHeldByCurrentThread()) {
118 WorkflowKey resolve(final String action, final String vnfType, final String vnfVersion,final String apiVersion) {
120 RankedAttributesContext context = new RankedAttributesContext() {
122 public Object getAttributeValue(String name) {
133 throw new IllegalStateException(name);
138 WorkflowKey wfKey = resolver().resolve(context);