| /* |
| * 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.cache.client.internal; |
| |
| import java.util.concurrent.RejectedExecutionException; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.apache.logging.log4j.Logger; |
| |
| import org.apache.geode.CancelException; |
| import org.apache.geode.cache.client.internal.PoolImpl.PoolTask; |
| import org.apache.geode.internal.InternalInstantiator; |
| import org.apache.geode.internal.cache.EventID; |
| import org.apache.geode.logging.internal.log4j.api.LogService; |
| |
| /** |
| * A listener which will try to resend the instantiators to all servers if the entire server |
| * distributed system was lost and came back one line. This listener also takes care of sending the |
| * initial list of instantiators to the servers <br> |
| * <br> |
| * TODO - There is a window in which all of the servers could crash and come back up and we would |
| * connect to a new server before realizing that all the servers crashed. To fix this, we would need |
| * to get some kind of birthdate of the server ds we connect and use that to decide if we need to |
| * recover instantiators. As it is, the window is not very large. |
| * |
| * |
| * |
| */ |
| public class InstantiatorRecoveryListener extends EndpointManager.EndpointListenerAdapter { |
| private static final Logger logger = LogService.getLogger(); |
| |
| private final AtomicInteger endpointCount = new AtomicInteger(); |
| protected final InternalPool pool; |
| protected final ScheduledExecutorService background; |
| protected final long pingInterval; |
| private final Object recoveryScheduledLock = new Object(); |
| private boolean recoveryScheduled; |
| |
| public InstantiatorRecoveryListener(ScheduledExecutorService background, InternalPool pool) { |
| this.background = background; |
| this.pool = pool; |
| pingInterval = pool.getPingInterval(); |
| } |
| |
| @Override |
| public void endpointCrashed(Endpoint endpoint) { |
| int count = endpointCount.decrementAndGet(); |
| if (logger.isDebugEnabled()) { |
| logger.debug("InstantiatorRecoveryTask - EndpointCrashed. Now have {} endpoints", count); |
| } |
| } |
| |
| @Override |
| public void endpointNoLongerInUse(Endpoint endpoint) { |
| int count = endpointCount.decrementAndGet(); |
| if (logger.isDebugEnabled()) { |
| logger.debug("InstantiatorRecoveryTask - EndpointNoLongerInUse. Now have {} endpoints", |
| count); |
| } |
| } |
| |
| @Override |
| public void endpointNowInUse(Endpoint endpoint) { |
| int count = endpointCount.incrementAndGet(); |
| final boolean isDebugEnabled = logger.isDebugEnabled(); |
| if (isDebugEnabled) { |
| logger.debug("InstantiatorRecoveryTask - EndpointNowInUse. Now have {} endpoints", count); |
| } |
| if (count == 1) { |
| synchronized (recoveryScheduledLock) { |
| if (!recoveryScheduled) { |
| try { |
| recoveryScheduled = true; |
| background.execute(new RecoveryTask()); |
| if (isDebugEnabled) { |
| logger.debug("InstantiatorRecoveryTask - Scheduled Recovery Task"); |
| } |
| } catch (RejectedExecutionException e) { |
| // ignore, the timer has been cancelled, which means we're shutting down. |
| } |
| } |
| } |
| } |
| } |
| |
| protected class RecoveryTask extends PoolTask { |
| |
| @Override |
| public void run2() { |
| if (pool.getCancelCriterion().isCancelInProgress()) { |
| return; |
| } |
| synchronized (recoveryScheduledLock) { |
| recoveryScheduled = false; |
| } |
| Object[] objects = InternalInstantiator.getInstantiatorsForSerialization(); |
| if (objects.length == 0) { |
| return; |
| } |
| EventID eventId = InternalInstantiator.generateEventId(); |
| // Fix for bug:40930 |
| if (eventId == null) { |
| background.schedule(new RecoveryTask(), pingInterval, TimeUnit.MILLISECONDS); |
| recoveryScheduled = true; |
| } else { |
| try { |
| RegisterInstantiatorsOp.execute(pool, objects, eventId); |
| } catch (CancelException e) { |
| throw e; |
| } catch (RejectedExecutionException e) { |
| // This is probably because we've started to shut down. |
| pool.getCancelCriterion().checkCancelInProgress(e); |
| throw e; // weird |
| } catch (Exception e) { |
| pool.getCancelCriterion().checkCancelInProgress(e); |
| |
| // If an exception occurred on the server, don't retry |
| Throwable cause = e.getCause(); |
| if (cause instanceof ClassNotFoundException) { |
| logger.warn("InstantiatorRecoveryTask - Error ClassNotFoundException: {}", |
| cause.getMessage()); |
| } else { |
| logger.warn("InstantiatorRecoveryTask - Error recovering instantiators:", |
| e); |
| } |
| } |
| } |
| } |
| } |
| } |