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authorJim Hahn <jrh3@att.com>2018-03-29 15:07:36 -0400
committerJim Hahn <jrh3@att.com>2018-04-03 10:55:19 -0400
commit3a80de9806cbdd0461716e814f5e674e259d42b3 (patch)
treee48400fcfee10f363538bad7efa177911b0c316c /policy-utils/src/main/java
parentca3efc7d2ee9522f995adc55baa6fff3279bba70 (diff)
Add api-resource-locks feature
Added ResourceLockFeatureAPI, to provide an interface for PolicyGuard to use to access other locking mechanisms. Move lock API to policy-core. Changed the interface and added Callback support. Added a class to invoke the API implementers. Changed to set a future instead of expecting the callback to implement the future interface. Also refactored, creating "lock" sub-package. Add junit tests. Increase junit coverage. IsLocked & isLockedBy should check all arguments. Make ImplFuture protected instead of public. Simplify locking - move callback support to an optional feature. Move Reference class to policy-utils. Return plain Future instead of LockRequestFuture. Change-Id: I65154d33833914b4332e02d1ef2512f4c5f09b16 Issue-ID: POLICY-577 Signed-off-by: Jim Hahn <jrh3@att.com>
Diffstat (limited to 'policy-utils/src/main/java')
-rw-r--r--policy-utils/src/main/java/org/onap/policy/drools/utils/Reference.java72
1 files changed, 72 insertions, 0 deletions
diff --git a/policy-utils/src/main/java/org/onap/policy/drools/utils/Reference.java b/policy-utils/src/main/java/org/onap/policy/drools/utils/Reference.java
new file mode 100644
index 00000000..0c4155fe
--- /dev/null
+++ b/policy-utils/src/main/java/org/onap/policy/drools/utils/Reference.java
@@ -0,0 +1,72 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2018 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.onap.policy.drools.utils;
+
+/**
+ * Reference to an object. Used within functional methods, where thread-safety is not
+ * required.
+ *
+ * @param <T> type of object contained within the reference
+ */
+public class Reference<T> {
+ private T value;
+
+ /**
+ *
+ * @param value
+ */
+ public Reference(T value) {
+ this.value = value;
+ }
+
+ /**
+ * @return the current value
+ */
+ public final T get() {
+ return value;
+ }
+
+ /**
+ * Sets the reference to point to a new value.
+ *
+ * @param newValue
+ */
+ public final void set(T newValue) {
+ this.value = newValue;
+ }
+
+ /**
+ * Sets the value to a new value, if the value is currently the same as the old value.
+ *
+ * @param oldValue
+ * @param newValue
+ * @return {@code true} if the value was updated, {@code false} otherwise
+ */
+ public boolean compareAndSet(T oldValue, T newValue) {
+ if (value == oldValue) {
+ value = newValue;
+ return true;
+
+ } else {
+ return false;
+ }
+ }
+}