content: /**
   * 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 com.alibaba.jstorm.transactional.utils;
  
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.ConcurrentHashMap;
  
  public class AckPendingBatchTracker<T> {
      // Map<BatchId, Map<StreamId, BatchTrackerInfo>>
      private Map<Long, Map<String, T>> tracker;
      // Map<BatchId, StartTimestamp>
      private Map<Long, Long> batchTs;
  
      public AckPendingBatchTracker() {
          tracker = new ConcurrentHashMap<>();
          batchTs = new ConcurrentHashMap<>();
      }
  
      public Set<Long> getBatchIds() {
          return tracker.keySet();
      }
  
      public Map<String, T> removeBatch(long batchId) {
          batchTs.remove(batchId);
          return tracker.remove(batchId);
      }
  
      public Map<String, T> getPendingBatchTracker(long batchId) {
          return getPendingBatchTracker(batchId, false);
      }
  
      public Map<String, T> getPendingBatchTracker(long batchId, boolean create) {
          Map<String, T> ret = tracker.get(batchId);
          if (ret == null && create) {
              ret = new HashMap<>();
              tracker.put(batchId, ret);
              batchTs.put(batchId, System.currentTimeMillis());
          }
          return ret;
      }
  
      public Set<String> getStreamIds(long batchId) {
          Set<String> ret = new HashSet<String>();
          Map<String, T> pendingBatches = getPendingBatchTracker(batchId);
          if (pendingBatches != null) {
              ret.addAll(pendingBatches.keySet());
          }
          return ret;
      }
  
      public T getPendingBatch(long batchId, String streamId) {
          return getPendingBatch(batchId, streamId, false);
      }
      public T getPendingBatch(long batchId, String streamId, boolean create) {
          Map<String, T> pendingBatches = getPendingBatchTracker(batchId, create);
          T ret = pendingBatches != null ? pendingBatches.get(streamId) : null;
          return ret;
      }
  
      public void putPendingBatch(long batchId, String streamId, T pendingBatch) {
          Map<String, T> pendingBatches = getPendingBatchTracker(batchId, true);
          pendingBatches.put(streamId, pendingBatch);
      }
  
      public long getBatchStartTime(long batchId) {
          Long time = batchTs.get(batchId);
          return  time != null ? time : 0l;
      }
  
      public void clear() {
          tracker.clear();
      }
  
      @Override
      public String toString() {
          return tracker.toString();
      }
  }