ImageAnalysisBlockingAnalyzer.java

/*
 * Copyright 2019 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.camera.core;

import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;

/**
 * OnImageAvailableListener with blocking behavior. It never drops image without analyzing it.
 *
 * <p> Used with {@link ImageAnalysis}.
 */
final class ImageAnalysisBlockingAnalyzer extends ImageAnalysisAbstractAnalyzer {

    ImageAnalysisBlockingAnalyzer(
            AtomicReference<ImageAnalysis.Analyzer> subscribedAnalyzer,
            AtomicInteger relativeRotation, AtomicReference<Executor> userExecutor) {
        super(subscribedAnalyzer, relativeRotation, userExecutor);
    }

    @Override
    public void onImageAvailable(ImageReaderProxy imageReaderProxy) {
        ImageProxy image = imageReaderProxy.acquireNextImage();
        if (image == null) {
            return;
        }
        Executor executor = mUserExecutor.get();
        if (executor != null) {
            try {
                executor.execute(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            analyzeImage(image);
                        } finally {
                            image.close();
                        }
                    }
                });
            } catch (RuntimeException e) {
                image.close();
            }
        } else {
            image.close();
        }
    }
}