/*
* Copyright (C) 2012 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.nf2m.util;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import com.nf2m.BuildConfig;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import logger.Log;
/**
* A simple subclass of {@link ImageResizer} that fetches and resizes images fetched from UriObserver URL.
*/
public class ImageFetcher extends ImageResizer {
private static final String TAG = "ImageFetcher";
private static final int ALBUM_CACHE_SIZE = 10 * 1024 * 1024; // 10MB
private static final String ALBUM_CACHE_DIR = "album";
private static final int IO_BUFFER_SIZE = 8 * 1024;
@Nullable
private DiskLruCache mAlbumDiskCache;
private File mAlbumCacheDir;
private boolean mAlbumDiskCacheStarting = true;
private final Object mAlbumDiskCacheLock = new Object();
private static final int DISK_CACHE_INDEX = 0;
/**
* Initialize providing UriObserver target image width and height for the processing images.
*
* @param context
* @param imageWidth
* @param imageHeight
*/
public ImageFetcher(@NonNull Context context, int imageWidth, int imageHeight) {
super(context, imageWidth, imageHeight);
init(context);
}
/**
* Initialize providing UriObserver single target image size (used for both width and height);
*
* @param context
* @param imageSize
*/
public ImageFetcher(@NonNull Context context, int imageSize) {
super(context, imageSize);
init(context);
}
private void init(@NonNull Context context) {
mAlbumCacheDir = ImageCache.getDiskCacheDir(context, ALBUM_CACHE_DIR);
}
@Override
protected void initDiskCacheInternal() {
super.initDiskCacheInternal();
initAlbumDiskCache();
}
private void initAlbumDiskCache() {
if (!mAlbumCacheDir.exists()) {
mAlbumCacheDir.mkdirs();
}
synchronized (mAlbumDiskCacheLock) {
if (ImageCache.getUsableSpace(mAlbumCacheDir) > ALBUM_CACHE_SIZE) {
try {
mAlbumDiskCache = DiskLruCache.open(mAlbumCacheDir, 1, 1, ALBUM_CACHE_SIZE);
if (BuildConfig.DEBUG) {
Log.d(TAG, "HTTP cache initialized");
}
} catch (IOException e) {
mAlbumDiskCache = null;
}
}
mAlbumDiskCacheStarting = false;
mAlbumDiskCacheLock.notifyAll();
}
}
@Override
protected void clearCacheInternal() {
super.clearCacheInternal();
synchronized (mAlbumDiskCacheLock) {
if (mAlbumDiskCache != null && !mAlbumDiskCache.isClosed()) {
try {
mAlbumDiskCache.delete();
if (BuildConfig.DEBUG) {
Log.d(TAG, "HTTP cache cleared");
}
} catch (IOException e) {
Log.e(TAG, "clearCacheInternal - " + e);
}
mAlbumDiskCache = null;
mAlbumDiskCacheStarting = true;
initAlbumDiskCache();
}
}
}
@Override
protected void flushCacheInternal() {
super.flushCacheInternal();
synchronized (mAlbumDiskCacheLock) {
if (mAlbumDiskCache != null) {
try {
mAlbumDiskCache.flush();
if (BuildConfig.DEBUG) {
Log.d(TAG, "HTTP cache flushed");
}
} catch (IOException e) {
Log.e(TAG, "flush - " + e);
}
}
}
}
@Override
protected void closeCacheInternal() {
super.closeCacheInternal();
synchronized (mAlbumDiskCacheLock) {
if (mAlbumDiskCache != null) {
try {
if (!mAlbumDiskCache.isClosed()) {
mAlbumDiskCache.close();
mAlbumDiskCache = null;
if (BuildConfig.DEBUG) {
Log.d(TAG, "HTTP cache closed");
}
}
} catch (IOException e) {
Log.e(TAG, "closeCacheInternal - " + e);
}
}
}
}
/**
* The main process method, which will be called by the ImageWorker in the AsyncTask background
* thread.
*
* @param data The data to load the bitmap, in this case, UriObserver regular http URL
* @return The downloaded and resized bitmap
*/
@Nullable
private Bitmap processBitmap(@NonNull String data) {
if (BuildConfig.DEBUG) {
Log.d(TAG, "processBitmap - " + data);
}
final String key = ImageCache.hashKeyForDisk(data);
FileDescriptor fileDescriptor = null;
FileInputStream fileInputStream = null;
DiskLruCache.Snapshot snapshot;
synchronized (mAlbumDiskCacheLock) {
// Wait for disk cache to initialize
while (mAlbumDiskCacheStarting) {
try {
mAlbumDiskCacheLock.wait();
} catch (InterruptedException ignored) {
}
}
if (mAlbumDiskCache != null) {
try {
snapshot = mAlbumDiskCache.get(key);
if (snapshot == null) {
DiskLruCache.Editor editor = mAlbumDiskCache.edit(key);
if (editor != null) {
if (saveAlbumToCache(data,
editor.newOutputStream(DISK_CACHE_INDEX))) {
editor.commit();
} else {
editor.abort();
}
}
snapshot = mAlbumDiskCache.get(key);
}
if (snapshot != null) {
fileInputStream =
(FileInputStream) snapshot.getInputStream(DISK_CACHE_INDEX);
fileDescriptor = fileInputStream.getFD();
}
} catch (@NonNull IOException | IllegalStateException e) {
Log.e(TAG, "processBitmap - " + e);
} finally {
if (fileDescriptor == null && fileInputStream != null) {
try {
fileInputStream.close();
} catch (IOException ignored) {
}
}
}
}
}
Bitmap bitmap = null;
if (fileDescriptor != null) {
bitmap = decodeSampledBitmapFromDescriptor(fileDescriptor, mImageWidth,
mImageHeight, getImageCache());
}
if (fileInputStream != null) {
try {
fileInputStream.close();
} catch (IOException ignored) {
}
}
return bitmap;
}
@Nullable
@Override
protected Bitmap processBitmap(Object data) {
return processBitmap(String.valueOf(data));
}
/**
* Download UriObserver bitmap from UriObserver URL and write the content to an output stream.
*
* @param urlString The URL to fetch
* @return true if successful, false otherwise
*/
private boolean saveAlbumToCache(String urlString, @NonNull OutputStream outputStream) {
BufferedOutputStream out = new BufferedOutputStream(outputStream, IO_BUFFER_SIZE);
Bitmap bitmap = BitmapFactory.decodeFile(urlString);
if (bitmap != null) {
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
return true;
}
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
return false;
}
}