EventSequence.java

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// Copyright 2012 Cloudera Inc.
//
// 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.cloudera.impala.util;

import java.util.List;

import com.cloudera.impala.thrift.TEventSequence;

import com.google.common.collect.Lists;

public class EventSequence {
  private final List<Long> timestamps_ = Lists.newArrayList();
  private final List<String> labels_ = Lists.newArrayList();

  private final long startTime_;
  private final String name_;

  public EventSequence(String name) {
    name_ = name;
    startTime_ = System.nanoTime();
  }

  public void markEvent(String label) {
    // Timestamps should be in ns resolution
    timestamps_.add(System.nanoTime() - startTime_);
    labels_.add(label);
  }

  public TEventSequence toThrift() {
    TEventSequence ret = new TEventSequence();
    ret.timestamps = timestamps_;
    ret.labels = labels_;
    ret.name = name_;
    return ret;
  }
}