/*
 * 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 org.apache.htrace.core;

/**
 * Wrap a Runnable with a Span that survives a change in threads.
 */
public class TraceRunnable implements Runnable {
  private final Tracer tracer;
  private final TraceScope parent;
  private final Runnable runnable;
  private final String description;

  public TraceRunnable(Tracer tracer, TraceScope parent,
      Runnable runnable, String description) {
    this.tracer = tracer;
    this.parent = parent;
    this.runnable = runnable;
    if (description == null) {
      this.description = Thread.currentThread().getName();
    } else {
      this.description = description;
    }
  }

  @Override
  public void run() {
    TraceScope chunk = tracer.newScope(description,
        parent.getSpan().getSpanId());
    try {
      runnable.run();
    } finally {
      chunk.close();
    }
  }

  public Runnable getRunnable() {
    return runnable;
  }
}