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authorJim Hahn <jrh3@att.com>2018-07-18 13:49:42 -0400
committerJim Hahn <jrh3@att.com>2018-07-18 14:54:29 -0400
commite8f1b7235f8338fbb9eba28d8cff29d3d6adf6e7 (patch)
treea71afb05855a68ef5ada2ffffaab74ab901b8ae4 /policy-core
parent6d7f829afe8e91d2c1cf33ec8dc770a515c9959d (diff)
Deny subsequent lock()
This is the final step of separating the lock "refresh" operation from the original "lock" operation. This step entails rejecting subsequent "lock" requests, even by the same owner, when a resource is already locked; "refresh" should now be used, instead, to extend a lock. Modified comments to indicate that the lock can only be extended using "refresh". Change-Id: I406cf60c076dbce87afbd94fb301732359dbd2db Issue-ID: POLICY-872 Signed-off-by: Jim Hahn <jrh3@att.com>
Diffstat (limited to 'policy-core')
-rw-r--r--policy-core/src/main/java/org/onap/policy/drools/core/lock/PolicyResourceLockFeatureAPI.java3
-rw-r--r--policy-core/src/main/java/org/onap/policy/drools/core/lock/SimpleLockManager.java16
-rw-r--r--policy-core/src/test/java/org/onap/policy/drools/core/lock/SimpleLockManagerTest.java4
3 files changed, 9 insertions, 14 deletions
diff --git a/policy-core/src/main/java/org/onap/policy/drools/core/lock/PolicyResourceLockFeatureAPI.java b/policy-core/src/main/java/org/onap/policy/drools/core/lock/PolicyResourceLockFeatureAPI.java
index ba6fe856..5aee490f 100644
--- a/policy-core/src/main/java/org/onap/policy/drools/core/lock/PolicyResourceLockFeatureAPI.java
+++ b/policy-core/src/main/java/org/onap/policy/drools/core/lock/PolicyResourceLockFeatureAPI.java
@@ -71,8 +71,7 @@ public interface PolicyResourceLockFeatureAPI extends OrderedService {
}
/**
- * This method is called before a lock is acquired on a resource. It may be
- * invoked repeatedly to extend the time that a lock is held.
+ * This method is called before a lock is acquired on a resource.
*
* @param resourceId
* @param owner
diff --git a/policy-core/src/main/java/org/onap/policy/drools/core/lock/SimpleLockManager.java b/policy-core/src/main/java/org/onap/policy/drools/core/lock/SimpleLockManager.java
index 081ad4c1..243ba3cb 100644
--- a/policy-core/src/main/java/org/onap/policy/drools/core/lock/SimpleLockManager.java
+++ b/policy-core/src/main/java/org/onap/policy/drools/core/lock/SimpleLockManager.java
@@ -74,7 +74,9 @@ public class SimpleLockManager {
}
/**
- * Attempts to lock a resource, extending the lock if the owner already holds it.
+ * Attempts to lock a resource, rejecting the lock if it is already owned, even if
+ * it's the same owner; the same owner can use {@link #refresh(String, String, int)
+ * refresh()}, instead, to extend a lock on a resource.
*
* @param resourceId
* @param owner
@@ -93,25 +95,19 @@ public class SimpleLockManager {
throw makeNullArgException(MSG_NULL_OWNER);
}
- Data existingLock;
+ boolean locked = false;
synchronized(locker) {
cleanUpLocks();
- if ((existingLock = resource2data.get(resourceId)) != null && existingLock.getOwner().equals(owner)) {
- // replace the existing lock with an extended lock
- locks.remove(existingLock);
- existingLock = null;
- }
-
- if (existingLock == null) {
+ if(!resource2data.containsKey(resourceId)) {
Data data = new Data(owner, resourceId, currentTime.getMillis() + TimeUnit.SECONDS.toMillis(holdSec));
resource2data.put(resourceId, data);
locks.add(data);
+ locked = true;
}
}
- boolean locked = (existingLock == null);
logger.info("lock {} for resource {} owner {}", locked, resourceId, owner);
return locked;
diff --git a/policy-core/src/test/java/org/onap/policy/drools/core/lock/SimpleLockManagerTest.java b/policy-core/src/test/java/org/onap/policy/drools/core/lock/SimpleLockManagerTest.java
index df6fb10a..feabdbc0 100644
--- a/policy-core/src/test/java/org/onap/policy/drools/core/lock/SimpleLockManagerTest.java
+++ b/policy-core/src/test/java/org/onap/policy/drools/core/lock/SimpleLockManagerTest.java
@@ -116,7 +116,7 @@ public class SimpleLockManagerTest {
assertTrue(mgr.isLockedBy(RESOURCE_A, OWNER1));
// extend the lock
- mgr.lock(RESOURCE_A, OWNER1, MAX_AGE_SEC);
+ mgr.refresh(RESOURCE_A, OWNER1, MAX_AGE_SEC);
// verify still locked after sleeping the other half of the cycle
testTime.sleep(MAX_AGE_MS/2+1);
@@ -132,7 +132,7 @@ public class SimpleLockManagerTest {
mgr.lock(RESOURCE_A, OWNER1, MAX_AGE_SEC);
// same owner
- assertTrue(mgr.lock(RESOURCE_A, OWNER1, MAX_AGE_SEC));
+ assertFalse(mgr.lock(RESOURCE_A, OWNER1, MAX_AGE_SEC));
// different owner
assertFalse(mgr.lock(RESOURCE_A, OWNER2, MAX_AGE_SEC));