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/*
* Copyright (C) 2017 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 com.android.launcher3.util;
import android.os.Trace;
import androidx.annotation.MainThread;
import java.util.function.Supplier;
/**
* A wrapper around {@link Trace} to allow better testing.
*
* To enable any tracing log, execute the following command:
* $ adb shell setprop log.tag.LAUNCHER_TRACE VERBOSE
* $ adb shell setprop log.tag.TAGNAME VERBOSE
*/
public class TraceHelper {
// Track binder class for this trace
public static final int FLAG_ALLOW_BINDER_TRACKING = 1 << 0;
// Temporarily ignore blocking binder calls for this trace.
public static final int FLAG_IGNORE_BINDERS = 1 << 1;
public static final int FLAG_CHECK_FOR_RACE_CONDITIONS = 1 << 2;
public static final int FLAG_UI_EVENT =
FLAG_ALLOW_BINDER_TRACKING | FLAG_CHECK_FOR_RACE_CONDITIONS;
/**
* Static instance of Trace helper, overridden in tests.
*/
public static TraceHelper INSTANCE = new TraceHelper();
/**
* @return a token to pass into {@link #endSection(Object)}.
*/
public Object beginSection(String sectionName) {
return beginSection(sectionName, 0);
}
public Object beginSection(String sectionName, int flags) {
Trace.beginSection(sectionName);
return null;
}
/**
* @param token the token returned from {@link #beginSection(String, int)}
*/
public void endSection(Object token) {
Trace.endSection();
}
/**
* Similar to {@link #beginSection} but doesn't add a trace section.
*/
public Object beginFlagsOverride(int flags) {
return null;
}
public void endFlagsOverride(Object token) { }
/**
* Temporarily ignore blocking binder calls for the duration of this {@link Supplier}.
*/
@MainThread
public static <T> T allowIpcs(String rpcName, Supplier<T> supplier) {
Object traceToken = INSTANCE.beginSection(rpcName, FLAG_IGNORE_BINDERS);
try {
return supplier.get();
} finally {
INSTANCE.endSection(traceToken);
}
}
}
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