MainThreadExecutor.java

/*
 * Copyright 2023 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 androidx.wear.protolayout.expression.pipeline;

import android.os.Handler;
import android.os.Looper;

import java.util.concurrent.Executor;

/** Implements an Executor that runs on the main thread. */
class MainThreadExecutor implements Executor {
    private final Handler mHandler;

    MainThreadExecutor() {
        this(new Handler(Looper.getMainLooper()));
    }

    MainThreadExecutor(Handler handler) {
        this.mHandler = handler;
    }

    @Override
    public void execute(Runnable r) {
        if (mHandler.getLooper().isCurrentThread()) {
            r.run();
        } else {
            mHandler.post(r);
        }
    }
}