| /* |
| * 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.tier.sockets; |
| |
| import org.apache.geode.internal.cache.LocalRegion; |
| import org.apache.geode.internal.cache.RegionEntry; |
| import org.apache.geode.internal.cache.Token; |
| import org.apache.geode.internal.cache.tier.MessageType; |
| |
| /** |
| * Matrix describes the state machine that needs to be applied to register interest response |
| * processing and events comming from notification chanel |
| * |
| * When register interest responses are deserialized and added to the cache, the following rules are |
| * applied |
| * |
| * 1) If the entry exists in the cache with a valid value, we consider it to be more current (either |
| * because it made it via the update channel or because the client updated it as part of put or |
| * invalidate) |
| * |
| * 2) If the entry is invalid, and the RI response is valid, the valid value is put into the cache |
| * |
| * 3) If an entry is marked destroyed (either from the client operation or via the update channel), |
| * it is not updated from the RI response. Destroyed entries are gathered up after the RI response |
| * is completed and removed from the system |
| * |
| * @since GemFire 5.1 |
| * |
| */ |
| public class ServerResponseMatrix { |
| |
| public static boolean checkForValidStateAfterRegisterInterest(LocalRegion region, Object key, |
| Object serverValue) { |
| int cacheEntryState = -1; |
| RegionEntry re = region.entries.getEntry(key); |
| if (re == null) { |
| // nonexistent |
| cacheEntryState = 0; |
| } else { |
| Token token = re.getValueAsToken(); |
| if (token == Token.DESTROYED) { |
| // destroyed |
| cacheEntryState = 3; |
| } else if (token == Token.INVALID) { |
| // invalid |
| cacheEntryState = 2; |
| } else { |
| // valid |
| cacheEntryState = 1; |
| } |
| } |
| |
| // A matrix During register interest response processing |
| // 4 nonexistent, valid , invalid,destroyed |
| // 2 invalid, valid |
| boolean matrix[][] = {{true, true}, {false, false}, {true, true}, {true, true}}; |
| |
| int registerInterstResState = 0; // invalid |
| if (serverValue != null) { |
| registerInterstResState = 1; // valid |
| } |
| return matrix[cacheEntryState][registerInterstResState]; |
| } |
| |
| public static boolean checkForValidStateAfterNotification(LocalRegion region, Object key, |
| int operation) { |
| |
| // 4 nonexistent/destroyed , valid , invalid,local-invalid , |
| // 4 create , update , invalidate, destroy |
| boolean matrix[][] = {{true, true, true, true}, {true, true, true, true}, |
| {true, true, true, true}, {true, true, true, true}}; |
| |
| int cacheEntryState = -1; |
| RegionEntry re = region.entries.getEntry(key); |
| if (re == null) { |
| // nonexistent or destroyed |
| cacheEntryState = 0; |
| } else { |
| Token token = re.getValueAsToken(); |
| if (token == Token.DESTROYED || token == Token.REMOVED_PHASE1 || token == Token.REMOVED_PHASE2 |
| || token == Token.TOMBSTONE) { |
| // destroyed |
| cacheEntryState = 0; |
| } else if (token == Token.LOCAL_INVALID) { |
| // local-invalid |
| cacheEntryState = 3; |
| } else if (token == Token.INVALID) { |
| // invalid |
| cacheEntryState = 2; |
| } else { |
| // valid |
| cacheEntryState = 1; |
| } |
| } |
| |
| int notificationState = -1; |
| switch (operation) { |
| case MessageType.LOCAL_CREATE: |
| notificationState = 0; |
| break; |
| case MessageType.LOCAL_UPDATE: |
| notificationState = 1; |
| break; |
| case MessageType.LOCAL_INVALIDATE: |
| notificationState = 2; |
| break; |
| case MessageType.LOCAL_DESTROY: |
| notificationState = 3; |
| break; |
| } |
| return matrix[cacheEntryState][notificationState]; |
| } |
| } |