TupleUtils.java

/**
 * 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 org.apache.storm.utils;

import java.util.Arrays;
import java.util.List;
import java.util.Map;

import org.apache.storm.Config;
import org.apache.storm.Constants;
import org.apache.storm.tuple.Tuple;

public final class TupleUtils {

  private TupleUtils() {
    // No instantiation
  }

  public static boolean isTick(Tuple tuple) {
    return tuple != null
        && Constants.SYSTEM_COMPONENT_ID.equals(tuple.getSourceComponent())
        && Constants.SYSTEM_TICK_STREAM_ID.equals(tuple.getSourceStreamId());
  }

  public static <T> int listHashCode(List<T> alist) {
    if (alist == null) {
      return 1;
    } else {
      return Arrays.deepHashCode(alist.toArray());
    }
  }

  public static Map<String, Object> putTickFrequencyIntoComponentConfig(Map<String, Object> conf,
                                                                        int tickFreqSecs) {
    if (conf != null && tickFreqSecs > 0) {
      conf.put(Config.TOPOLOGY_TICK_TUPLE_FREQ_SECS, tickFreqSecs);
    }

    return conf;
  }

}