| /* |
| * 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; |
| |
| import java.io.Closeable; |
| |
| public class TraceScope implements Closeable { |
| |
| /** |
| * the span for this scope |
| */ |
| private final Span span; |
| |
| /** |
| * the span that was "current" before this scope was entered |
| */ |
| private final Span savedSpan; |
| |
| private boolean detached = false; |
| |
| TraceScope(Span span, Span saved) { |
| this.span = span; |
| this.savedSpan = saved; |
| } |
| |
| public Span getSpan() { |
| return span; |
| } |
| |
| /** |
| * Remove this span as the current thread, but don't stop it yet or |
| * send it for collection. This is useful if the span object is then |
| * passed to another thread for use with Trace.continueTrace(). |
| * |
| * @return the same Span object |
| */ |
| public Span detach() { |
| detached = true; |
| |
| Span cur = Tracer.getInstance().currentSpan(); |
| if (cur != span) { |
| Tracer.LOG.debug("Closing trace span " + span + " but " + |
| cur + " was top-of-stack"); |
| } else { |
| Tracer.getInstance().setCurrentSpan(savedSpan); |
| } |
| return span; |
| } |
| |
| /** |
| * Return true when {@link #detach()} has been called. Helpful when debugging |
| * multiple threads working on a single span. |
| */ |
| public boolean isDetached() { |
| return detached; |
| } |
| |
| @Override |
| public void close() { |
| if (span == null) return; |
| |
| if (!detached) { |
| // The span is done |
| span.stop(); |
| detach(); |
| } |
| } |
| } |