| /* |
| * 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; |
| |
| import java.util.concurrent.Callable; |
| |
| /** |
| * Wrap a Callable with a Span that survives a change in threads. |
| */ |
| public class TraceCallable<V> implements Callable<V> { |
| private final Tracer tracer; |
| private final Callable<V> impl; |
| private final TraceScope parent; |
| private final String description; |
| |
| TraceCallable(Tracer tracer, TraceScope parent, Callable<V> impl, |
| String description) { |
| this.tracer = tracer; |
| this.impl = impl; |
| this.parent = parent; |
| if (description == null) { |
| this.description = Thread.currentThread().getName(); |
| } else { |
| this.description = description; |
| } |
| } |
| |
| @Override |
| public V call() throws Exception { |
| TraceScope chunk = tracer.newScope(description, |
| parent.getSpan().getSpanId()); |
| try { |
| return impl.call(); |
| } finally { |
| chunk.close(); |
| } |
| } |
| |
| public Callable<V> getImpl() { |
| return impl; |
| } |
| } |