1 files changed, 130 insertions, 0 deletions
diff --git a/app-c/appc/appc-dispatcher/appc-dispatcher-common/lock-manager-lib/lock-manager-impl/src/main/java/org/openecomp/appc/lockmanager/impl/inmemory/LockManagerInMemoryImpl.java b/app-c/appc/appc-dispatcher/appc-dispatcher-common/lock-manager-lib/lock-manager-impl/src/main/java/org/openecomp/appc/lockmanager/impl/inmemory/LockManagerInMemoryImpl.java
new file mode 100644
index 000000000..309e2790c
--- /dev/null
+++ b/app-c/appc/appc-dispatcher/appc-dispatcher-common/lock-manager-lib/lock-manager-impl/src/main/java/org/openecomp/appc/lockmanager/impl/inmemory/LockManagerInMemoryImpl.java
@@ -0,0 +1,130 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * openECOMP : APP-C
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights
+ * 						reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.appc.lockmanager.impl.inmemory;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.openecomp.appc.lockmanager.api.LockException;
+import org.openecomp.appc.lockmanager.api.LockManager;
+import com.att.eelf.configuration.EELFLogger;
+import com.att.eelf.configuration.EELFManager;
+
+
+public class LockManagerInMemoryImpl implements LockManager {
+
+    private static LockManagerInMemoryImpl instance = null;
+    private Map<String, LockValue> lockedVNFs;
+
+    private static final EELFLogger debugLogger = EELFManager.getInstance().getDebugLogger();
+
+    private LockManagerInMemoryImpl() {
+        lockedVNFs = new ConcurrentHashMap<>();
+    }
+
+    public static LockManager getLockManager() {
+        if(instance == null) {
+            instance = new LockManagerInMemoryImpl();
+        }
+        return instance;
+    }
+
+    @Override
+    public boolean acquireLock(String resource, String owner) throws LockException {
+        return acquireLock(resource, owner, 0);
+    }
+
+    @Override
+    public boolean acquireLock(String resource, String owner, long timeout) throws LockException {
+        debugLogger.debug("Try to acquire lock on resource " + resource + " with owner " + owner);
+        long now = System.currentTimeMillis();
+        LockValue lockValue = lockedVNFs.get(resource);
+        if (lockValue != null) {
+            if (lockIsMine(lockValue, owner, now) || hasExpired(lockValue, now)) {
+                setExpirationTime(resource, owner, timeout, now);
+                debugLogger.debug("Locked successfully resource " + resource + " with owner " + owner + " for " + timeout + " ms");
+                return hasExpired(lockValue, now);
+            }
+            else {
+                debugLogger.debug("Owner " + owner + " tried to lock resource " + resource + " but it is already locked by owner " + lockValue.getOwner());
+                throw new LockException("Owner " + owner + " tried to lock resource " + resource + " but it is already locked by owner " + lockValue.getOwner());
+            }
+        }
+        else {
+            setExpirationTime(resource, owner, timeout, now);
+            debugLogger.debug("Locked successfully resource " + resource + " with owner " + owner + " for " + timeout + " ms");
+            return true;
+        }
+    }
+
+    @Override
+    public void releaseLock(String resource, String owner) throws LockException {
+        debugLogger.debug("Try to release lock on resource " + resource + " with owner " + owner);
+        long now = System.currentTimeMillis();
+        LockValue lockValue = lockedVNFs.get(resource);
+        if (lockValue != null) {
+            if (!hasExpired(lockValue, now)) {
+                if (isOwner(lockValue, owner)) {
+                    debugLogger.debug("Unlocked successfully resource " + resource + " with owner " + owner);
+                    lockedVNFs.remove(resource);
+                }
+                else {
+                    debugLogger.debug("Unlock failed. Tried to release lock on resource " + resource + " from owner " + owner + " but it is held by a different owner");
+                    throw new LockException("Unlock failed. Tried to release lock on resource " + resource + " from owner " + owner + " but it is held by a different owner");
+                }
+            }
+            else {
+                lockedVNFs.remove(resource);
+                debugLogger.debug("Unlock failed. lock on resource " + resource + " has expired");
+                throw new LockException("Unlock failed. lock on resource " + resource + " has expired");
+            }
+
+        }
+        else {
+            debugLogger.debug("Tried to release lock on resource " + resource + " from owner " + owner + " but there  is not lock on this resource");
+            throw new LockException("Tried to release lock on resource " + resource + " from owner " + owner + " but there  is not lock on this resource");
+        }
+    }
+
+    @Override
+    public boolean isLocked(String resource) {
+        return lockedVNFs.get(resource)!=null?true:false;
+    }
+
+    private boolean lockIsMine(LockValue lockValue, String owner, long now) {
+        return isOwner(lockValue, owner) && !hasExpired(lockValue, now);
+    }
+
+    private boolean isOwner(LockValue lockValue, String owner) {
+        return lockValue.getOwner() != null && lockValue.getOwner().equals(owner);
+    }
+
+    private boolean hasExpired(LockValue lockValue, long now) {
+        return (lockValue.getExpirationTime() != 0 && now > lockValue.getExpirationTime());
+    }
+
+    private void setExpirationTime(String resource, String owner, long timeout, long now) {
+        long expirationTime = timeout == 0 ? 0 : now + timeout;
+        LockValue lockValue = new LockValue(owner, expirationTime);
+        lockedVNFs.put(resource, lockValue);
+    }
+}