LoggingImageReader.java revision 1738db31add0aea5a6a6f2c137ca6fc476a10237 
1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.camera.one.v2;
18
19import com.android.camera.debug.Log.Tag;
20import com.android.camera.debug.Logger;
21import com.android.camera.one.v2.camera2proxy.ForwardingImageProxy;
22import com.android.camera.one.v2.camera2proxy.ForwardingImageReader;
23import com.android.camera.one.v2.camera2proxy.ImageProxy;
24import com.android.camera.one.v2.camera2proxy.ImageReaderProxy;
25
26import java.util.concurrent.atomic.AtomicBoolean;
27import java.util.concurrent.atomic.AtomicInteger;
28
29import javax.annotation.Nullable;
30
31final class LoggingImageReader extends ForwardingImageReader {
32    private class LoggingImageProxy extends ForwardingImageProxy {
33        private final AtomicBoolean mClosed;
34
35        public LoggingImageProxy(ImageProxy proxy) {
36            super(proxy);
37            mClosed = new AtomicBoolean(false);
38        }
39
40        @Override
41        public void close() {
42            if (!mClosed.getAndSet(true)) {
43                super.close();
44                decrementOpenImageCount();
45            }
46        }
47    }
48
49    private final Logger mLog;
50    private final AtomicInteger mNumOpenImages;
51
52    public LoggingImageReader(ImageReaderProxy delegate, Logger.Factory logFactory) {
53        super(delegate);
54        mLog = logFactory.create(new Tag("LoggingImageReader"));
55        mNumOpenImages = new AtomicInteger(0);
56    }
57
58    @Override
59    @Nullable
60    public ImageProxy acquireNextImage() {
61        return decorateNewImage(super.acquireNextImage());
62    }
63
64    @Override
65    @Nullable
66    public ImageProxy acquireLatestImage() {
67        return decorateNewImage(super.acquireLatestImage());
68    }
69
70    @Nullable
71    private ImageProxy decorateNewImage(@Nullable ImageProxy image) {
72        if (image == null) {
73            return null;
74        }
75        incrementOpenImageCount();
76        return new LoggingImageProxy(image);
77    }
78
79    @Override
80    public void close() {
81        mLog.d("Closing: " + toString());
82        super.close();
83    }
84
85    private void incrementOpenImageCount() {
86        int numOpenImages = mNumOpenImages.incrementAndGet();
87        if (numOpenImages >= getMaxImages()) {
88            mLog.e(String.format("Open Image Count (%d) exceeds maximum (%d)!",
89                    numOpenImages, getMaxImages()));
90        }
91    }
92
93    private void decrementOpenImageCount() {
94        int numOpenImages = mNumOpenImages.decrementAndGet();
95    }
96}
97