diff options
author | Jim Hahn <jrh3@att.com> | 2018-03-29 15:07:36 -0400 |
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committer | Jim Hahn <jrh3@att.com> | 2018-04-03 10:55:19 -0400 |
commit | 3a80de9806cbdd0461716e814f5e674e259d42b3 (patch) | |
tree | e48400fcfee10f363538bad7efa177911b0c316c /policy-utils/src/main/java/org | |
parent | ca3efc7d2ee9522f995adc55baa6fff3279bba70 (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/org')
-rw-r--r-- | policy-utils/src/main/java/org/onap/policy/drools/utils/Reference.java | 72 |
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; + } + } +} |