Add injectable version of Assert.isMainThread()

/*

 * Copyright (C) 2021 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.systemui.util.concurrency

import android.os.Looper

import javax.inject.Inject

/**

 * Methods to check or assert that we're on the main thread

 */

interface Execution {

    fun assertIsMainThread()

    fun isMainThread(): Boolean

}

class ExecutionImpl @Inject constructor() : Execution {

    private val mainLooper = Looper.getMainLooper()

    override fun assertIsMainThread() {

        if (!mainLooper.isCurrentThread) {

            throw IllegalStateException("should be called from the main thread." +

                    " Main thread name=" + mainLooper.thread.name +

                    " Thread.currentThread()=" + Thread.currentThread().name)

        }

    }

    override fun isMainThread(): Boolean {

        return mainLooper.isCurrentThread

    }

}

class FakeExecution : Execution {

    var simulateMainThread = true

    override fun assertIsMainThread() {

        if (!simulateMainThread) {

            throw IllegalStateException("should be called from the main thread")

        }

    }

    override fun isMainThread(): Boolean {

        return simulateMainThread

    }

}

import java.util.concurrent.Executor;

import javax.inject.Singleton;

import dagger.Binds;

import dagger.Module;

import dagger.Provides;

        return context.getMainExecutor();

    }

    /** */

    @Binds

    @Singleton

    public abstract Execution provideExecution(ExecutionImpl execution);

}