| /* |
| * 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.geode.internal.cache.wan; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.logging.log4j.Logger; |
| |
| import org.apache.geode.CancelException; |
| import org.apache.geode.cache.asyncqueue.AsyncEventListener; |
| import org.apache.geode.logging.internal.log4j.api.LogService; |
| |
| /** |
| * Class <code>SerialGatewayEventCallbackDispatcher</code> dispatches batches of |
| * <code>GatewayEvent</code>s to <code>AsyncEventListener</code> callback implementers. This |
| * dispatcher is used in the write-behind case. |
| * |
| * @since GemFire 7.0 |
| */ |
| public class GatewaySenderEventCallbackDispatcher implements GatewaySenderEventDispatcher { |
| |
| private static final Logger logger = LogService.getLogger(); |
| |
| /** |
| * The <code>SerialGatewayEventProcessor</code> used by this <code>CacheListener</code> to process |
| * events. |
| */ |
| protected final AbstractGatewaySenderEventProcessor eventProcessor; |
| |
| /** |
| * The <code>AsyncEventListener</code>s registered on this |
| * <code>SerialGatewayEventCallbackDispatcher</code>. |
| */ |
| private volatile List<AsyncEventListener> eventListeners = Collections.emptyList(); |
| |
| /** |
| * A lock to protect access to the registered <code>AsyncEventListener</code>s. |
| */ |
| private final Object eventLock = new Object(); |
| |
| public GatewaySenderEventCallbackDispatcher(AbstractGatewaySenderEventProcessor eventProcessor) { |
| this.eventProcessor = eventProcessor; |
| initializeEventListeners(); |
| } |
| |
| /** |
| * Dispatches a batch of messages to all registered <code>AsyncEventListener</code>s. |
| * |
| * @param events The <code>List</code> of events to send |
| * @param removeFromQueueOnException Unused. |
| * @return whether the batch of messages was successfully processed |
| */ |
| @Override |
| public boolean dispatchBatch(List events, boolean removeFromQueueOnException, boolean isRetry) { |
| GatewaySenderStats statistics = this.eventProcessor.sender.getStatistics(); |
| boolean success = false; |
| try { |
| if (logger.isDebugEnabled()) { |
| logger.debug("About to dispatch batch"); |
| } |
| long start = statistics.startTime(); |
| // Send the batch to the corresponding GatewaySender |
| success = dispatchBatch(events); |
| statistics.endBatch(start, events.size()); |
| if (logger.isDebugEnabled()) { |
| logger.debug("Done dispatching the batch"); |
| } |
| } catch (GatewaySenderException e) { |
| // Do nothing in this case. The exception has already been logged. |
| } catch (CancelException e) { |
| this.eventProcessor.setIsStopped(true); |
| throw e; |
| } catch (Exception e) { |
| logger.fatal( |
| "Stopping the processor because the following exception occurred while processing a batch:", |
| e); |
| this.eventProcessor.setIsStopped(true); |
| } |
| return success; |
| } |
| |
| /** |
| * Registers a <code>AsyncEventListener</code>. |
| * |
| * @param listener A AsyncEventListener to be registered |
| */ |
| public void registerAsyncEventListener(AsyncEventListener listener) { |
| synchronized (eventLock) { |
| List<AsyncEventListener> oldListeners = this.eventListeners; |
| if (!oldListeners.contains(listener)) { |
| List<AsyncEventListener> newListeners = new ArrayList<AsyncEventListener>(oldListeners); |
| newListeners.add(listener); |
| this.eventListeners = newListeners; |
| } |
| } |
| } |
| |
| /** |
| * Removes registration of a previously registered <code>AsyncEventListener</code>. |
| * |
| * @param listener A AsyncEventListener to be unregistered |
| */ |
| public void unregisterGatewayEventListener(AsyncEventListener listener) { |
| synchronized (eventLock) { |
| List<AsyncEventListener> oldListeners = this.eventListeners; |
| if (oldListeners.contains(listener)) { |
| List<AsyncEventListener> newListeners = new ArrayList<AsyncEventListener>(oldListeners); |
| if (newListeners.remove(listener)) { |
| this.eventListeners = newListeners; |
| } |
| } |
| } |
| } |
| |
| protected void initializeEventListeners() { |
| for (AsyncEventListener listener : this.eventProcessor.getSender().getAsyncEventListeners()) { |
| registerAsyncEventListener(listener); |
| } |
| } |
| |
| /** |
| * Sends a batch of messages to the registered <code>AsyncEventListener</code>s. |
| * |
| * @param events The <code>List</code> of events to send |
| * |
| */ |
| protected boolean dispatchBatch(List events) throws GatewaySenderException { |
| if (events.isEmpty()) { |
| return true; |
| } |
| int batchId = this.eventProcessor.getBatchId(); |
| boolean successAll = true; |
| try { |
| for (AsyncEventListener listener : this.eventListeners) { |
| boolean successOne = listener.processEvents(events); |
| if (!successOne) { |
| successAll = false; |
| } |
| } |
| } catch (Exception e) { |
| final String alias = |
| "%s: Exception during processing batch %s"; |
| final Object[] aliasArgs = new Object[] {this, Integer.valueOf(batchId)}; |
| String exMsg = String.format(alias, aliasArgs); |
| GatewaySenderException ge = new GatewaySenderException(exMsg, e); |
| logger.warn(exMsg, ge); |
| throw ge; |
| } |
| return successAll; |
| } |
| |
| @Override |
| public boolean isRemoteDispatcher() { |
| return false; |
| } |
| |
| @Override |
| public boolean isConnectedToRemote() { |
| return false; |
| } |
| |
| @Override |
| public void stop() { |
| // no op |
| |
| } |
| |
| @Override |
| public void shutDownAckReaderConnection() { |
| // no op |
| } |
| } |