| /* |
| * 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.event; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import org.apache.geode.DataSerializable; |
| import org.apache.geode.DataSerializer; |
| import org.apache.geode.internal.cache.versions.VersionTag; |
| |
| /** |
| * A sequence number tracker to keep events from clients from being re-applied to the cache if |
| * they've already been seen. |
| * |
| * @since GemFire 5.5 |
| */ |
| public class EventSequenceNumberHolder implements DataSerializable { |
| private static final long serialVersionUID = 8137262960763308046L; |
| |
| /** |
| * event sequence number. These |
| */ |
| private long lastSequenceNumber = -1; |
| |
| /** |
| * millisecond timestamp |
| */ |
| private transient long endOfLifeTimestamp; |
| |
| /** |
| * whether this entry is being removed |
| */ |
| private transient boolean removed; |
| |
| /** |
| * version tag, if any, for the operation |
| */ |
| private VersionTag versionTag; |
| |
| // for debugging |
| // transient Exception context; |
| |
| EventSequenceNumberHolder(long id, VersionTag versionTag) { |
| lastSequenceNumber = id; |
| this.versionTag = versionTag; |
| } |
| |
| public EventSequenceNumberHolder() {} |
| |
| public long getLastSequenceNumber() { |
| return lastSequenceNumber; |
| } |
| |
| public VersionTag getVersionTag() { |
| return versionTag; |
| } |
| |
| public boolean isRemoved() { |
| return removed; |
| } |
| |
| void setRemoved(boolean removed) { |
| this.removed = removed; |
| } |
| |
| void setEndOfLifeTimestamp(long endOfLifeTimestamp) { |
| this.endOfLifeTimestamp = endOfLifeTimestamp; |
| } |
| |
| void setVersionTag(VersionTag versionTag) { |
| this.versionTag = versionTag; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder result = new StringBuilder(); |
| result.append("seqNo").append(lastSequenceNumber); |
| if (versionTag != null) { |
| result.append(",").append(versionTag); |
| } |
| return result.toString(); |
| } |
| |
| @Override |
| public void fromData(DataInput in) throws IOException, ClassNotFoundException { |
| lastSequenceNumber = in.readLong(); |
| versionTag = DataSerializer.readObject(in); |
| } |
| |
| @Override |
| public void toData(DataOutput out) throws IOException { |
| out.writeLong(lastSequenceNumber); |
| DataSerializer.writeObject(versionTag, out); |
| } |
| |
| public synchronized boolean expire(long now, long expirationTime) { |
| if (endOfLifeTimestamp == 0) { |
| endOfLifeTimestamp = now; // a new holder - start the timer |
| } |
| boolean expire = false; |
| if (endOfLifeTimestamp <= expirationTime) { |
| removed = true; |
| lastSequenceNumber = -1; |
| expire = true; |
| } |
| return expire; |
| } |
| |
| public void setLastSequenceNumber(long lastSequenceNumber) { |
| this.lastSequenceNumber = lastSequenceNumber; |
| } |
| } |