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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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 android.telecom.Logging;
import android.telecom.Log;
/**
* Encapsulates session logging in a Runnable to reduce code duplication when continuing subsessions
* in a handler/thread.
* @hide
*/
public abstract class Runnable {
private Session mSubsession;
private final String mSubsessionName;
private final Object mLock;
private final java.lang.Runnable mRunnable = new java.lang.Runnable() {
@Override
public void run() {
synchronized (mLock) {
try {
Log.continueSession(mSubsession, mSubsessionName);
loggedRun();
} finally {
if (mSubsession != null) {
Log.endSession();
mSubsession = null;
}
}
}
}
};
/**
* Creates a new Telecom Runnable that incorporates Session Logging into it. Useful for carrying
* Logging Sessions through different threads as well as through handlers.
* @param subsessionName The name that will be used in the Logs to mark this Session
* @param lock The synchronization lock that will be used to lock loggedRun().
*/
public Runnable(String subsessionName, Object lock) {
if (lock == null) {
mLock = new Object();
} else {
mLock = lock;
}
mSubsessionName = subsessionName;
}
/**
* Return the runnable that will be canceled in the handler queue.
* @return Runnable object to cancel.
*/
public final java.lang.Runnable getRunnableToCancel() {
return mRunnable;
}
/**
* Creates a Runnable and a logging subsession that can be used in a handler/thread. Be sure to
* call cancel() if this session is never going to be run (removed from a handler queue, for
* for example).
* @return A Java Runnable that can be used in a handler queue or thread.
*/
public java.lang.Runnable prepare() {
cancel();
mSubsession = Log.createSubsession();
return mRunnable;
}
/**
* This method is used to clean up the active session if the Runnable gets removed from a
* handler and is never run.
*/
public void cancel() {
synchronized (mLock) {
Log.cancelSubsession(mSubsession);
mSubsession = null;
}
}
/**
* The method that will be run in the handler/thread.
*/
abstract public void loggedRun();
}
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