/
MemoryMapState.java
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/
MemoryMapState.java
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/**
* 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.storm.trident.testing;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.storm.task.IMetricsContext;
import org.apache.storm.trident.state.ITupleCollection;
import org.apache.storm.trident.state.OpaqueValue;
import org.apache.storm.trident.state.State;
import org.apache.storm.trident.state.StateFactory;
import org.apache.storm.trident.state.ValueUpdater;
import org.apache.storm.trident.state.map.IBackingMap;
import org.apache.storm.trident.state.map.MapState;
import org.apache.storm.trident.state.map.OpaqueMap;
import org.apache.storm.trident.state.map.RemovableMapState;
import org.apache.storm.trident.state.map.SnapshottableMap;
import org.apache.storm.trident.state.snapshot.Snapshottable;
import org.apache.storm.tuple.Values;
public class MemoryMapState<T> implements Snapshottable<T>, ITupleCollection, MapState<T>, RemovableMapState<T> {
static ConcurrentHashMap<String, Map<List<Object>, Object>> dbs = new ConcurrentHashMap<String, Map<List<Object>, Object>>();
MemoryMapStateBacking<OpaqueValue> backing;
SnapshottableMap<T> delegate;
List<List<Object>> removed = new ArrayList();
Long currTx = null;
public MemoryMapState(String id) {
backing = new MemoryMapStateBacking(id);
delegate = new SnapshottableMap(OpaqueMap.build(backing), new Values("$MEMORY-MAP-STATE-GLOBAL$"));
}
@Override
public T update(ValueUpdater updater) {
return delegate.update(updater);
}
@Override
public void set(T o) {
delegate.set(o);
}
@Override
public T get() {
return delegate.get();
}
@Override
public void beginCommit(Long txid) {
delegate.beginCommit(txid);
if (txid == null || !txid.equals(currTx)) {
backing.multiRemove(removed);
}
removed = new ArrayList();
currTx = txid;
}
@Override
public void commit(Long txid) {
delegate.commit(txid);
}
@Override
public Iterator<List<Object>> getTuples() {
return backing.getTuples();
}
@Override
public List<T> multiUpdate(List<List<Object>> keys, List<ValueUpdater> updaters) {
return delegate.multiUpdate(keys, updaters);
}
@Override
public void multiPut(List<List<Object>> keys, List<T> vals) {
delegate.multiPut(keys, vals);
}
@Override
public List<T> multiGet(List<List<Object>> keys) {
return delegate.multiGet(keys);
}
@Override
public void multiRemove(List<List<Object>> keys) {
List nulls = new ArrayList();
for (int i = 0; i < keys.size(); i++) {
nulls.add(null);
}
// first just set the keys to null, then flag to remove them at beginning of next commit when we know the current and last value
// are both null
multiPut(keys, nulls);
removed.addAll(keys);
}
public static class Factory implements StateFactory {
String id;
public Factory() {
id = UUID.randomUUID().toString();
}
@Override
public State makeState(Map<String, Object> conf, IMetricsContext metrics, int partitionIndex, int numPartitions) {
return new MemoryMapState(id + partitionIndex);
}
}
static class MemoryMapStateBacking<T> implements IBackingMap<T>, ITupleCollection {
Map<List<Object>, T> db;
Long currTx;
MemoryMapStateBacking(String id) {
if (!dbs.containsKey(id)) {
dbs.put(id, new HashMap());
}
this.db = (Map<List<Object>, T>) dbs.get(id);
}
public static void clearAll() {
dbs.clear();
}
public void multiRemove(List<List<Object>> keys) {
for (List<Object> key : keys) {
db.remove(key);
}
}
@Override
public List<T> multiGet(List<List<Object>> keys) {
List<T> ret = new ArrayList();
for (List<Object> key : keys) {
ret.add(db.get(key));
}
return ret;
}
@Override
public void multiPut(List<List<Object>> keys, List<T> vals) {
for (int i = 0; i < keys.size(); i++) {
List<Object> key = keys.get(i);
T val = vals.get(i);
db.put(key, val);
}
}
@Override
public Iterator<List<Object>> getTuples() {
return new Iterator<List<Object>>() {
private Iterator<Map.Entry<List<Object>, T>> it = db.entrySet().iterator();
@Override
public boolean hasNext() {
return it.hasNext();
}
@Override
public List<Object> next() {
Map.Entry<List<Object>, T> e = it.next();
List<Object> ret = new ArrayList<Object>();
ret.addAll(e.getKey());
ret.add(((OpaqueValue) e.getValue()).getCurr());
return ret;
}
@Override
public void remove() {
throw new UnsupportedOperationException("Not supported yet.");
}
};
}
}
}