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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.dialer.strictmode;
import android.os.StrictMode;
import android.os.StrictMode.ThreadPolicy;
import android.os.StrictMode.VmPolicy;
import com.android.dialer.buildtype.BuildType;
/**
* Enables strict mode for the application, and provides means of temporarily disabling it.
*
* <p>NOTE: All methods in this class are stripped by proguard in release builds.
*/
public final class DialerStrictMode {
/** Initializes strict mode on application start. */
public static void onApplicationCreate() {
enableDeathPenalty();
}
/**
* Disables the strict mode death penalty. If strict mode is enabled for the build, warnings are
* printed instead of the application crashing.
*
* <p>You should typically do this only temporarily and restore the death penalty in a finally
* block using {@link #enableDeathPenalty()}.
*/
public static void disableDeathPenalty() {
if (isStrictModeAllowed()) {
StrictMode.setThreadPolicy(threadPolicyTemplate().build());
StrictMode.setVmPolicy(vmPolicyTemplate().build());
}
}
/**
* Restore the death penalty. This should typically be called in a finally block after calling
* {@link #disableDeathPenalty()}.
*/
public static void enableDeathPenalty() {
if (isStrictModeAllowed()) {
StrictMode.setThreadPolicy(threadPolicyTemplate().penaltyDeath().build());
StrictMode.setVmPolicy(vmPolicyTemplate().penaltyDeath().build());
}
}
private static ThreadPolicy.Builder threadPolicyTemplate() {
return new StrictMode.ThreadPolicy.Builder().detectAll().penaltyLog();
}
private static VmPolicy.Builder vmPolicyTemplate() {
return new StrictMode.VmPolicy.Builder().detectAll().penaltyLog();
}
private static boolean isStrictModeAllowed() {
return BuildType.get() == BuildType.BUGFOOD;
}
/** Functional interface intended to be used with {@link #bypass(Provider)}. */
public interface Provider<T> {
T get();
}
/**
* Convenience method for disabling and enabling the death penalty using lambdas.
*
* <p>For example:
*
* <p><code>
* DialerStrictMode.bypass(() -> doDiskAccessOnMainThread());
* </code>
*/
public static <T> T bypass(Provider<T> provider) {
disableDeathPenalty();
try {
return provider.get();
} finally {
enableDeathPenalty();
}
}
}
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