| /** |
| * 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; |
| |
| import org.apache.commons.lang.builder.ToStringBuilder; |
| |
| public class OpaqueValue<T> { |
| Long currTxid; |
| T prev; |
| T curr; |
| |
| public OpaqueValue(Long currTxid, T val, T prev) { |
| this.curr = val; |
| this.currTxid = currTxid; |
| this.prev = prev; |
| } |
| |
| public OpaqueValue(Long currTxid, T val) { |
| this(currTxid, val, null); |
| } |
| |
| public OpaqueValue<T> update(Long batchTxid, T newVal) { |
| T prev; |
| if(batchTxid==null || (this.currTxid < batchTxid)) { |
| prev = this.curr; |
| } else if(batchTxid.equals(this.currTxid)){ |
| prev = this.prev; |
| } else { |
| throw new RuntimeException("Current batch (" + batchTxid + ") is behind state's batch: " + this.toString()); |
| } |
| return new OpaqueValue<T>(batchTxid, newVal, prev); |
| } |
| |
| public T get(Long batchTxid) { |
| if(batchTxid==null || (this.currTxid < batchTxid)) { |
| return curr; |
| } else if(batchTxid.equals(this.currTxid)){ |
| return prev; |
| } else { |
| throw new RuntimeException("Current batch (" + batchTxid + ") is behind state's batch: " + this.toString()); |
| } |
| } |
| |
| public T getCurr() { |
| return curr; |
| } |
| |
| public Long getCurrTxid() { |
| return currTxid; |
| } |
| |
| public T getPrev() { |
| return prev; |
| } |
| |
| @Override |
| public String toString() { |
| return ToStringBuilder.reflectionToString(this); |
| } |
| } |