integration_test/src/java/com/twitter/heron/integration_test/core/MultiPhaseTestSpout.java

// Copyright 2016 Twitter. All rights reserved.
//
// Licensed 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.twitter.heron.integration_test.core;

import java.util.logging.Logger;

import com.twitter.heron.api.spout.IRichSpout;

/**
 * Spout that delegates to another spout to emit tuples, satisfy a restartCondition and repeat, up
 * to totalPhases times.
 */
class MultiPhaseTestSpout extends IntegrationTestSpout {
  private static final long serialVersionUID = 4375157636632941400L;
  private static final Logger LOG = Logger.getLogger(MultiPhaseTestSpout.class.getName());

  private final Condition restartCondition;
  private final int executionsPerPhase;
  private final int totalPhases;
  private int phasesComplete;

  MultiPhaseTestSpout(IRichSpout delegateSpout, int executionsPerPhase,
                      int totalPhases, Condition restartCondition, String topologyStartedStateUrl) {
    super(delegateSpout, executionsPerPhase, topologyStartedStateUrl);
    this.executionsPerPhase = executionsPerPhase;
    this.totalPhases = totalPhases;
    this.restartCondition = restartCondition;
    this.phasesComplete = 0;
  }

  @Override
  protected void emitTerminalIfNeeded() {
    if (doneEmitting() && doneAcking()) {
      phasesComplete++;
      LOG.info(String.format("Completed phase %d of %d", phasesComplete, totalPhases));
      if (phasesComplete == totalPhases) {
        super.emitTerminalIfNeeded();
      } else {
        LOG.info(String.format("Satisfying restartCondition before starting phase %d",
            phasesComplete + 1));
        restartCondition.satisfyCondition();
        LOG.info(String.format("Resetting maxExecutions=%s to start phase %d",
            executionsPerPhase, phasesComplete + 1));
        super.resetMaxExecutions(this.executionsPerPhase);
      }
    }
  }
}