| /** |
| * 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.state.map; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import org.apache.storm.trident.state.TransactionalValue; |
| import org.apache.storm.trident.state.ValueUpdater; |
| |
| |
| public class TransactionalMap<T> implements MapState<T> { |
| CachedBatchReadsMap<TransactionalValue> backing; |
| Long currTx; |
| |
| protected TransactionalMap(IBackingMap<TransactionalValue> backing) { |
| this.backing = new CachedBatchReadsMap(backing); |
| } |
| |
| public static <T> MapState<T> build(IBackingMap<TransactionalValue> backing) { |
| return new TransactionalMap<T>(backing); |
| } |
| |
| @Override |
| public List<T> multiGet(List<List<Object>> keys) { |
| List<CachedBatchReadsMap.RetVal<TransactionalValue>> vals = backing.multiGet(keys); |
| List<T> ret = new ArrayList<T>(vals.size()); |
| for (CachedBatchReadsMap.RetVal<TransactionalValue> retval : vals) { |
| TransactionalValue v = retval.val; |
| if (v != null) { |
| ret.add((T) v.getVal()); |
| } else { |
| ret.add(null); |
| } |
| } |
| return ret; |
| } |
| |
| @Override |
| public List<T> multiUpdate(List<List<Object>> keys, List<ValueUpdater> updaters) { |
| List<CachedBatchReadsMap.RetVal<TransactionalValue>> curr = backing.multiGet(keys); |
| List<TransactionalValue> newVals = new ArrayList<TransactionalValue>(curr.size()); |
| List<List<Object>> newKeys = new ArrayList(); |
| List<T> ret = new ArrayList<T>(); |
| for (int i = 0; i < curr.size(); i++) { |
| CachedBatchReadsMap.RetVal<TransactionalValue> retval = curr.get(i); |
| TransactionalValue<T> val = retval.val; |
| ValueUpdater<T> updater = updaters.get(i); |
| TransactionalValue<T> newVal; |
| boolean changed = false; |
| if (val == null) { |
| newVal = new TransactionalValue<T>(currTx, updater.update(null)); |
| changed = true; |
| } else { |
| if (currTx != null && currTx.equals(val.getTxid()) && !retval.cached) { |
| newVal = val; |
| } else { |
| newVal = new TransactionalValue<T>(currTx, updater.update(val.getVal())); |
| changed = true; |
| } |
| } |
| ret.add(newVal.getVal()); |
| if (changed) { |
| newVals.add(newVal); |
| newKeys.add(keys.get(i)); |
| } |
| } |
| if (!newKeys.isEmpty()) { |
| backing.multiPut(newKeys, newVals); |
| } |
| return ret; |
| } |
| |
| @Override |
| public void multiPut(List<List<Object>> keys, List<T> vals) { |
| List<TransactionalValue> newVals = new ArrayList<TransactionalValue>(vals.size()); |
| for (T val : vals) { |
| newVals.add(new TransactionalValue<T>(currTx, val)); |
| } |
| backing.multiPut(keys, newVals); |
| } |
| |
| @Override |
| public void beginCommit(Long txid) { |
| currTx = txid; |
| backing.reset(); |
| } |
| |
| @Override |
| public void commit(Long txid) { |
| currTx = null; |
| backing.reset(); |
| } |
| } |