/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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 com.hazelcast.map.impl.operation;
import com.hazelcast.config.MapConfig;
import com.hazelcast.map.impl.MapContainer;
import com.hazelcast.map.impl.MapDataSerializerHook;
import com.hazelcast.map.impl.MapService;
import com.hazelcast.map.impl.MapServiceContext;
import com.hazelcast.map.impl.PartitionContainer;
import com.hazelcast.map.impl.mapstore.writebehind.WriteBehindQueue;
import com.hazelcast.map.impl.mapstore.writebehind.WriteBehindStore;
import com.hazelcast.map.impl.mapstore.writebehind.entry.DelayedEntries;
import com.hazelcast.map.impl.mapstore.writebehind.entry.DelayedEntry;
import com.hazelcast.map.impl.recordstore.RecordStore;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.nio.serialization.IdentifiedDataSerializable;
import java.io.IOException;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Queue;
/**
* Holder for write-behind-specific state.
*/
public class WriteBehindStateHolder implements IdentifiedDataSerializable {
private MapReplicationOperation mapReplicationOperation;
private Map<String, List<DelayedEntry>> delayedEntries;
/**
* @see WriteBehindStore#flushSequences
*/
private Map<String, Queue<WriteBehindStore.Sequence>> flushSequences;
/**
* This constructor exists solely for instantiation by {@code MapDataSerializerHook}. The object is not ready to use
* unless {@code mapReplicationOperation} is set.
*/
public WriteBehindStateHolder() {
}
public WriteBehindStateHolder(MapReplicationOperation mapReplicationOperation) {
this.mapReplicationOperation = mapReplicationOperation;
}
void prepare(PartitionContainer container, int replicaIndex) {
int size = container.getMaps().size();
flushSequences = new HashMap<String, Queue<WriteBehindStore.Sequence>>(size);
delayedEntries = new HashMap<String, List<DelayedEntry>>(size);
for (Map.Entry<String, RecordStore> entry : container.getMaps().entrySet()) {
RecordStore recordStore = entry.getValue();
MapContainer mapContainer = recordStore.getMapContainer();
MapConfig mapConfig = mapContainer.getMapConfig();
if (mapConfig.getTotalBackupCount() < replicaIndex
|| !mapContainer.getMapStoreContext().isWriteBehindMapStoreEnabled()) {
continue;
}
WriteBehindStore mapDataStore = (WriteBehindStore) recordStore.getMapDataStore();
WriteBehindQueue<DelayedEntry> writeBehindQueue = mapDataStore.getWriteBehindQueue();
List<DelayedEntry> entries = writeBehindQueue.asList();
if (entries == null || entries.isEmpty()) {
continue;
}
String mapName = entry.getKey();
delayedEntries.put(mapName, entries);
flushSequences.put(mapName, new ArrayDeque<WriteBehindStore.Sequence>(mapDataStore.getFlushSequences()));
}
}
void applyState() {
for (Map.Entry<String, List<DelayedEntry>> entry : delayedEntries.entrySet()) {
String mapName = entry.getKey();
RecordStore recordStore = mapReplicationOperation.getRecordStore(mapName);
WriteBehindStore mapDataStore = (WriteBehindStore) recordStore.getMapDataStore();
mapDataStore.reset();
mapDataStore.setFlushSequences(flushSequences.get(mapName));
Collection<DelayedEntry> replicatedEntries = entry.getValue();
for (DelayedEntry delayedEntry : replicatedEntries) {
mapDataStore.add(delayedEntry);
mapDataStore.setSequence(delayedEntry.getSequence());
}
}
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
MapService mapService = mapReplicationOperation.getService();
MapServiceContext mapServiceContext = mapService.getMapServiceContext();
out.writeInt(delayedEntries.size());
for (Map.Entry<String, List<DelayedEntry>> entry : delayedEntries.entrySet()) {
out.writeUTF(entry.getKey());
List<DelayedEntry> delayedEntryList = entry.getValue();
out.writeInt(delayedEntryList.size());
for (DelayedEntry e : delayedEntryList) {
Data key = mapServiceContext.toData(e.getKey());
Data value = mapServiceContext.toData(e.getValue());
out.writeData(key);
out.writeData(value);
out.writeLong(e.getStoreTime());
out.writeInt(e.getPartitionId());
out.writeLong(e.getSequence());
}
}
out.writeInt(flushSequences.size());
for (Map.Entry<String, Queue<WriteBehindStore.Sequence>> entry : flushSequences.entrySet()) {
out.writeUTF(entry.getKey());
Queue<WriteBehindStore.Sequence> queue = entry.getValue();
out.writeInt(queue.size());
for (WriteBehindStore.Sequence sequence : queue) {
out.writeLong(sequence.getSequence());
out.writeBoolean(sequence.isFullFlush());
}
}
}
@Override
public void readData(ObjectDataInput in) throws IOException {
int size = in.readInt();
delayedEntries = new HashMap<String, List<DelayedEntry>>(size);
for (int i = 0; i < size; i++) {
String mapName = in.readUTF();
int listSize = in.readInt();
List<DelayedEntry> delayedEntriesList = new ArrayList<DelayedEntry>(listSize);
for (int j = 0; j < listSize; j++) {
Data key = in.readData();
Data value = in.readData();
long storeTime = in.readLong();
int partitionId = in.readInt();
long sequence = in.readLong();
DelayedEntry<Data, Data> entry = DelayedEntries.createDefault(key, value, storeTime, partitionId);
entry.setSequence(sequence);
delayedEntriesList.add(entry);
}
delayedEntries.put(mapName, delayedEntriesList);
}
int expectedSize = in.readInt();
flushSequences = new HashMap<String, Queue<WriteBehindStore.Sequence>>(expectedSize);
for (int i = 0; i < expectedSize; i++) {
String mapName = in.readUTF();
int setSize = in.readInt();
Queue<WriteBehindStore.Sequence> queue = new ArrayDeque<WriteBehindStore.Sequence>(setSize);
for (int j = 0; j < setSize; j++) {
queue.add(new WriteBehindStore.Sequence(in.readLong(), in.readBoolean()));
}
flushSequences.put(mapName, queue);
}
}
@Override
public int getFactoryId() {
return MapDataSerializerHook.F_ID;
}
@Override
public int getId() {
return MapDataSerializerHook.WRITE_BEHIND_STATE_HOLDER;
}
}