2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2017 AT&T Intellectual Property. All rights
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.ccsdk.sli.adaptors.lock.comp;
24 import java.util.ArrayList;
25 import java.util.Collection;
26 import java.util.Collections;
27 import java.util.Date;
28 import java.util.List;
29 import org.onap.ccsdk.sli.adaptors.lock.dao.ResourceLockDao;
30 import org.onap.ccsdk.sli.adaptors.lock.data.ResourceLock;
31 import org.slf4j.Logger;
32 import org.slf4j.LoggerFactory;
34 public class LockHelperImpl implements LockHelper {
36 private static final Logger log = LoggerFactory.getLogger(LockHelperImpl.class);
38 private ResourceLockDao resourceLockDao;
39 private int retryCount = 10;
40 private int lockWait = 5; // Seconds
43 public void lock(String resourceName, String lockRequester, int lockTimeout /* Seconds */) {
44 lock(Collections.singleton(resourceName), lockRequester, lockTimeout);
48 public void unlock(String resourceName, boolean force) {
49 unlock(Collections.singleton(resourceName), force);
53 public void lock(Collection<String> resourceNameList, String lockRequester, int lockTimeout /* Seconds */) {
54 for (int i = 0; true; i++) {
56 tryLock(resourceNameList, lockRequester, lockTimeout);
57 log.info("Resources locked: " + resourceNameList);
59 } catch (ResourceLockedException e) {
64 Thread.sleep(lockWait * 1000);
65 } catch (InterruptedException ex) {
72 public void unlock(Collection<String> lockNames, boolean force) {
73 if (lockNames == null || lockNames.size() == 0) {
78 for (String name : lockNames) {
79 ResourceLock l = resourceLockDao.getByResourceName(name);
81 if (force || l.lockCount == 1) {
82 resourceLockDao.delete(l.id);
84 resourceLockDao.decrementLockCount(l.id);
89 resourceLockDao.commit();
91 log.info("Resources unlocked: " + lockNames);
93 resourceLockDao.rollback();
97 public void tryLock(Collection<String> resourceNameList, String lockRequester, int lockTimeout /* Seconds */) {
98 if (resourceNameList == null || resourceNameList.size() == 0) {
102 lockRequester = generateLockRequester(lockRequester, 100);
104 // First check if all requested records are available to lock
106 Date now = new Date();
109 List<ResourceLock> dbLockList = new ArrayList<>();
110 List<String> insertLockNameList = new ArrayList<>();
111 for (String name : resourceNameList) {
112 ResourceLock l = resourceLockDao.getByResourceName(name);
114 boolean canLock = l == null || now.getTime() > l.expirationTime.getTime() ||
115 lockRequester != null && lockRequester.equals(l.lockHolder) || l.lockCount <= 0;
117 throw new ResourceLockedException(l.resourceName, l.lockHolder, lockRequester);
123 insertLockNameList.add(name);
127 // Update the lock info in DB
128 for (ResourceLock l : dbLockList) {
129 resourceLockDao.update(l.id, now, new Date(now.getTime() + lockTimeout * 1000), l.lockCount + 1);
132 // Insert records for those that are not yet there
133 for (String lockName : insertLockNameList) {
134 ResourceLock l = new ResourceLock();
135 l.resourceName = lockName;
136 l.lockHolder = lockRequester;
138 l.expirationTime = new Date(now.getTime() + lockTimeout * 1000);
142 resourceLockDao.add(l);
143 } catch (Exception e) {
144 log.info("Failed to insert lock record: " + lockName);
145 throw new ResourceLockedException(l.resourceName, "unknown", lockRequester);
149 resourceLockDao.commit();
152 resourceLockDao.rollback();
156 private static String generateLockRequester(String name, int maxLength) {
160 int l1 = name.length();
161 String tname = Thread.currentThread().getName();
162 int l2 = tname.length();
163 if (l1 + l2 + 1 > maxLength) {
164 int maxl1 = maxLength / 2;
166 name = name.substring(0, maxl1);
169 int maxl2 = maxLength - l1 - 1;
171 tname = tname.substring(0, 6) + "..." + tname.substring(l2 - maxl2 + 9);
174 return tname + '-' + name;
177 public void setResourceLockDao(ResourceLockDao resourceLockDao) {
178 this.resourceLockDao = resourceLockDao;
181 public void setRetryCount(int retryCount) {
182 this.retryCount = retryCount;
185 public void setLockWait(int lockWait /* Seconds */) {
186 this.lockWait = lockWait;