Merged HEAD-BUG-FIX (5.0/Cloud) to HEAD (4.3/Cloud)

73348: Merged V4.2-BUG-FIX (4.2.3) to HEAD-BUG-FIX (4.3/Cloud)
      73162: Merged V4.1-BUG-FIX (4.1.10) to V4.2-BUG-FIX (4.2.3)
         73054: Added LockDAO.releaseLockQuiet and used it for the callback's precautionary lock release
          - Fixes MNT-11507: JobLockService automatic refresh is triggering a retry under normal conditions
          - Prevents a DEBUG message from RetryingTransactionInterceptor when the normal condition is for
            the lock to no longer exist


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@74766 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/domain/locks/AbstractLockDAOImpl.java

@@ -175,6 +175,22 @@ public abstract class AbstractLockDAOImpl implements LockDAO
         return updateLocks(lockQName, lockToken, LOCK_TOKEN_RELEASED, 0L, optimistic);
     }
     
+    @Override
+    public boolean releaseLockQuiet(QName lockQName, String lockToken)
+    {
+        try
+        {
+            updateLocks(lockQName, lockToken, LOCK_TOKEN_RELEASED, 0L, false);
+            // It worked
+            return true;
+        }
+        catch (LockAcquisitionException e)
+        {
+            // We absorb this
+            return false;
+        }
+    }
+    
     /**
      * Put new values against the given exclusive lock.  This works against the related locks as well.
      * @param optimistic                    <tt>true</tt> if a mismatch in the number of locked rows should

source/java/org/alfresco/repo/domain/locks/LockDAO.java

@@ -71,11 +71,22 @@ public interface LockDAO
      * @param lockToken             the current lock token
      * @param optimistic            <tt>true</tt> if the release attempt is enough even
      *                              if the number of released locks was incorrect.
-     * @return                      <tt>true</tt> if the lock was successfully (and completely)
-     *                              released or <tt>false</tt> if the lock was no longer valid
-     *                              <b>and the method was being called optimistically.</b>
+     * @return                      Returns <tt>true</tt> if all the required locks were
+     *                              (still) held under the lock token and were
+     *                              valid at the time of release, otherwise <tt>false</tt>
      * @throws LockAcquisitionException     if the number of locks released was incorrect
      *                              and pessimistic release is requested.
      */
     boolean releaseLock(QName lockQName, String lockToken, boolean optimistic);
+    
+    /**
+     * Release a lock without throwing any exceptions if the lock was not updated.
+     * 
+     * @param lockQName             the unique name of the lock to release
+     * @param lockToken             the current lock token
+     * @return                      Returns <tt>true</tt> if all the required locks were
+     *                              (still) held under the lock token and were
+     *                              valid at the time of release, otherwise <tt>false</tt>
+     */
+    boolean releaseLockQuiet(QName lockQName, String lockToken);
 }

source/java/org/alfresco/repo/lock/JobLockServiceImpl.java

@@ -136,6 +136,7 @@ public class JobLockServiceImpl implements JobLockService
     /**
      * {@inheritDoc}
      */
+    @Override
     public void getTransactionalLock(QName lockQName, long timeToLive)
     {
         getTransactionalLock(lockQName, timeToLive, defaultRetryWait, defaultRetryCount);
@@ -144,6 +145,7 @@ public class JobLockServiceImpl implements JobLockService
     /**
      * {@inheritDoc}
      */
+    @Override
     public void getTransactionalLock(QName lockQName, long timeToLive, long retryWait, int retryCount)
     {
         // Check that transaction is present
@@ -204,6 +206,7 @@ public class JobLockServiceImpl implements JobLockService
      * 
      * @see #getLock(QName, long, long, int)
      */
+    @Override
     public String getLock(QName lockQName, long timeToLive)
     {
         return getLock(lockQName, timeToLive, defaultRetryWait, defaultRetryCount);
@@ -212,6 +215,7 @@ public class JobLockServiceImpl implements JobLockService
     /**
      * {@inheritDoc}
      */
+    @Override
     public String getLock(QName lockQName, long timeToLive, long retryWait, int retryCount)
     {
         String lockToken = GUID.generate();
@@ -225,6 +229,7 @@ public class JobLockServiceImpl implements JobLockService
      * 
      * @throws LockAcquisitionException on failure
      */
+    @Override
     public void refreshLock(final String lockToken, final QName lockQName, final long timeToLive)
     {
         RetryingTransactionCallback<Object> refreshLockCallback = new RetryingTransactionCallback<Object>()
@@ -347,16 +352,13 @@ public class JobLockServiceImpl implements JobLockService
                     }
                     // The callback is no longer active, so we don't need to refresh.
                     // Release the lock in case the initiator did not do it.
-                    try
+                    // We just want to release and don't care if the lock was already released
+                    // or taken by another process
+                    if (releaseLockQuiet(lockToken, lockQName))
                     {
-                        releaseLock(lockToken, lockQName);
                         // The callback must be informed as we released the lock automatically
                         callLockReleased(callback);
                     }
-                    catch (LockAcquisitionException e)
-                    {
-                        // The lock is already gone: job done
-                    }
                 }
                 else
                 {
@@ -419,6 +421,7 @@ public class JobLockServiceImpl implements JobLockService
     /**
      * {@inheritDoc}
      */
+    @Override
     public void releaseLock(final String lockToken, final QName lockQName)
     {
     	releaseLockVerify(lockToken, lockQName);
@@ -439,6 +442,27 @@ public class JobLockServiceImpl implements JobLockService
         return retryingTransactionHelper.doInTransaction(releaseCallback, false, true);
     }
 
+    /**
+     * Attempt to release a lock but do not worry about not being able to update the lock.
+     * If the lock was taken by another process, then it will not matter.  Any other database-related
+     * conditions will still trigger a retry.
+     * 
+     * @param lockToken             the unique lock token to release (expired or not)
+     * @param lockQName             the name of the lock
+     * @return                      <tt>true</tt> if the lock was released or <tt>false</tt> if not
+     */
+    private boolean releaseLockQuiet(final String lockToken, final QName lockQName)
+    {
+        RetryingTransactionCallback<Boolean> releaseCallback = new RetryingTransactionCallback<Boolean>()
+        {
+            public Boolean execute() throws Throwable
+            {
+                return lockDAO.releaseLockQuiet(lockQName, lockToken);
+            }
+        };
+        return retryingTransactionHelper.doInTransaction(releaseCallback, false, true);
+    }
+
     /**
      * @throws LockAcquisitionException on failure
      */