svn commit: r1710176 - /sling/trunk/bundles/extensions/discovery/commons/src/main/java/org/apache/sling/discovery/commons/providers/base/AsyncEvent.java

[st...@apache.org]

Author: stefanegli
Date: Fri Oct 23 11:28:41 2015
New Revision: 1710176

URL: http://svn.apache.org/viewvc?rev=1710176&view=rev
Log:
SLING-5094 / SLING-5173 / SLING-4603 related : ensure that before invoking the ConsistencyService.sync no async events are still in the queue. This is achieved by enqueueing an async event too that once it gets triggered ensures that no async events are left. This mechanism ensures that before the syncToken is written, all TopologyEventListeners have received a TOPOLOGY_CHANGING - and only that guarantees that the syncToken mechanism carries a high guarantee.

Added:
    sling/trunk/bundles/extensions/discovery/commons/src/main/java/org/apache/sling/discovery/commons/providers/base/AsyncEvent.java   (with props)

Added: sling/trunk/bundles/extensions/discovery/commons/src/main/java/org/apache/sling/discovery/commons/providers/base/AsyncEvent.java
URL: http://svn.apache.org/viewvc/sling/trunk/bundles/extensions/discovery/commons/src/main/java/org/apache/sling/discovery/commons/providers/base/AsyncEvent.java?rev=1710176&view=auto
==============================================================================
--- sling/trunk/bundles/extensions/discovery/commons/src/main/java/org/apache/sling/discovery/commons/providers/base/AsyncEvent.java (added)
+++ sling/trunk/bundles/extensions/discovery/commons/src/main/java/org/apache/sling/discovery/commons/providers/base/AsyncEvent.java Fri Oct 23 11:28:41 2015
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+package org.apache.sling.discovery.commons.providers.base;
+
+/**
+ * An AsyncEvent can be enqueued to the AsyncEventSender for
+ * later, asynchronous triggering
+ */
+public interface AsyncEvent {
+
+    /**
+     * As soon as this AsyncEvent is at the front of AsyncEventSender's
+     * FIFO queue it will be invoked via this trigger() method.
+     */
+    void trigger();
+    
+}

Propchange: sling/trunk/bundles/extensions/discovery/commons/src/main/java/org/apache/sling/discovery/commons/providers/base/AsyncEvent.java
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