| /** |
| * 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.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| |
| public class CachedBatchReadsMap<T> { |
| public IBackingMap<T> _delegate; |
| Map<List<Object>, T> _cached = new HashMap<List<Object>, T>(); |
| |
| public CachedBatchReadsMap(IBackingMap<T> delegate) { |
| _delegate = delegate; |
| } |
| |
| public void reset() { |
| _cached.clear(); |
| } |
| |
| public List<RetVal<T>> multiGet(List<List<Object>> keys) { |
| // TODO: can optimize further by only querying backing map for keys not in the cache |
| List<T> vals = _delegate.multiGet(keys); |
| List<RetVal<T>> ret = new ArrayList(vals.size()); |
| for (int i = 0; i < keys.size(); i++) { |
| List<Object> key = keys.get(i); |
| if (_cached.containsKey(key)) { |
| ret.add(new RetVal(_cached.get(key), true)); |
| } else { |
| ret.add(new RetVal(vals.get(i), false)); |
| } |
| } |
| return ret; |
| } |
| |
| public void multiPut(List<List<Object>> keys, List<T> vals) { |
| _delegate.multiPut(keys, vals); |
| cache(keys, vals); |
| } |
| |
| private void cache(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); |
| _cached.put(key, val); |
| } |
| } |
| |
| public static class RetVal<T> { |
| public boolean cached; |
| public T val; |
| |
| public RetVal(T v, boolean c) { |
| val = v; |
| cached = c; |
| } |
| } |
| |
| |
| } |