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
   * <p/>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p/>
   * 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 storm.trident.windowing;
  
  import java.util.List;
  import java.util.Map;
  
  import org.apache.commons.lang.IllegalClassException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.common.collect.Lists;
  
  import backtype.storm.topology.FailedException;
  import storm.trident.operation.TridentCollector;
  import storm.trident.operation.TridentOperationContext;
  import storm.trident.state.StateUpdater;
  import storm.trident.tuple.TridentTuple;
  
  /**
   * {@code StateUpdater<WindowState>} instance which removes successfully emitted triggers from store
   */
  public class WindowsStateUpdater implements StateUpdater<WindowsState> {
      private static final Logger LOG = LoggerFactory.getLogger(WindowsStateUpdater.class);
  
      private final WindowsStoreFactory windowStoreFactory;
      private WindowsStore windowsStore;
  
      public WindowsStateUpdater(WindowsStoreFactory windowStoreFactory) {
          this.windowStoreFactory = windowStoreFactory;
      }
  
      @Override
      public void updateState(WindowsState state, List<TridentTuple> tuples, TridentCollector collector) {
          Long currentTxId = state.getCurrentTxId();
          LOG.debug("Removing triggers using WindowStateUpdater, txnId: [{}] ", currentTxId);
          for (TridentTuple tuple : tuples) {
              try {
                  Object fieldValue = tuple.getValueByField(WindowTridentProcessor.TRIGGER_FIELD_NAME);
                  if (!(fieldValue instanceof WindowTridentProcessor.TriggerInfo)) {
                      throw new IllegalClassException(WindowTridentProcessor.TriggerInfo.class, fieldValue.getClass());
                  }
                  WindowTridentProcessor.TriggerInfo triggerInfo = (WindowTridentProcessor.TriggerInfo) fieldValue;
                  String triggerCompletedKey = WindowTridentProcessor.getWindowTriggerInprocessIdPrefix(triggerInfo.windowTaskId) + currentTxId;
  
                  LOG.debug("Removing trigger key [{}] and trigger completed key [{}] from store: [{}]", triggerInfo, triggerCompletedKey, windowsStore);
  
                  windowsStore.removeAll(Lists.newArrayList(triggerInfo.generateTriggerKey(), triggerCompletedKey));
              } catch (Exception ex) {
                  LOG.warn(ex.getMessage());
                  collector.reportError(ex);
                  throw new FailedException(ex);
              }
          }
      }
  
      @Override
      public void prepare(Map conf, TridentOperationContext context) {
          windowsStore = windowStoreFactory.create();
      }
  
      @Override
      public void cleanup() {
          windowsStore.shutdown();
      }
  }
  