/**
* 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.waveprotocol.box.stat;
import java.util.Map;
/**
* Saves and restores scope and timer of asynchronous call.
*
* @author akaplanov@gmail.com (A. Kaplanov)
*/
@SuppressWarnings({"rawtypes"})
public class AsyncCallContext {
final Map<Class, RequestScope.Value> values;
final Timer timer;
private AsyncCallContext(Map<Class, RequestScope.Value> values, Timer timer) {
this.values = values;
this.timer = timer;
}
/**
* Clones scope values and creates new timer.
*
* @param name the name of new task.
* @return context with new scope and timer.
*/
public static AsyncCallContext start(String name) {
Map<Class, RequestScope.Value> values = null;
Timer timer = null;
if (Timing.isEnabled()) {
values = Timing.cloneScopeValues();
ExecutionTree tree = (ExecutionTree)values.get(ExecutionTree.class);
if (tree != null) {
timer = tree.start(name);
}
}
return new AsyncCallContext(values, timer);
}
/**
* Enters to cloned scope and stop timer.
*/
public void stop() {
if (timer != null && timer.isActive()) {
Timing.enterScope(values);
Timing.stop(timer);
}
}
}