Java 类com.facebook.common.disk.NoOpDiskTrimmableRegistry 实例源码

private DiskCacheConfig(Builder builder) {
  mVersion = builder.mVersion;
  mBaseDirectoryName = Preconditions.checkNotNull(builder.mBaseDirectoryName);
  mBaseDirectoryPathSupplier = Preconditions.checkNotNull(builder.mBaseDirectoryPathSupplier);
  mDefaultSizeLimit = builder.mMaxCacheSize;
  mLowDiskSpaceSizeLimit = builder.mMaxCacheSizeOnLowDiskSpace;
  mMinimumSizeLimit = builder.mMaxCacheSizeOnVeryLowDiskSpace;
  mEntryEvictionComparatorSupplier =
      Preconditions.checkNotNull(builder.mEntryEvictionComparatorSupplier);
  mCacheErrorLogger =
      builder.mCacheErrorLogger == null ?
          NoOpCacheErrorLogger.getInstance() :
          builder.mCacheErrorLogger;
  mCacheEventListener =
      builder.mCacheEventListener == null ?
          NoOpCacheEventListener.getInstance() :
          builder.mCacheEventListener;
  mDiskTrimmableRegistry =
      builder.mDiskTrimmableRegistry == null ?
          NoOpDiskTrimmableRegistry.getInstance() :
          builder.mDiskTrimmableRegistry;
  mContext = builder.mContext;
  mIndexPopulateAtStartupEnabled = builder.mIndexPopulateAtStartupEnabled;
}

private DiskCacheConfig(Builder builder) {
  mVersion = builder.mVersion;
  mBaseDirectoryName = Preconditions.checkNotNull(builder.mBaseDirectoryName);
  mBaseDirectoryPathSupplier = Preconditions.checkNotNull(builder.mBaseDirectoryPathSupplier);
  mDefaultSizeLimit = builder.mMaxCacheSize;
  mLowDiskSpaceSizeLimit = builder.mMaxCacheSizeOnLowDiskSpace;
  mMinimumSizeLimit = builder.mMaxCacheSizeOnVeryLowDiskSpace;
  mEntryEvictionComparatorSupplier =
      Preconditions.checkNotNull(builder.mEntryEvictionComparatorSupplier);
  mCacheErrorLogger =
      builder.mCacheErrorLogger == null ?
          NoOpCacheErrorLogger.getInstance() :
          builder.mCacheErrorLogger;
  mCacheEventListener =
      builder.mCacheEventListener == null ?
          NoOpCacheEventListener.getInstance() :
          builder.mCacheEventListener;
  mDiskTrimmableRegistry =
      builder.mDiskTrimmableRegistry == null ?
          NoOpDiskTrimmableRegistry.getInstance() :
          builder.mDiskTrimmableRegistry;
  mContext = builder.mContext;
  mIndexPopulateAtStartupEnabled = builder.mIndexPopulateAtStartupEnabled;
}

private DiskCacheConfig getDiskCacheConfig() {
    return DiskCacheConfig.newBuilder(this)
            .setBaseDirectoryPath(getDiskCacheDir(this))
            .setBaseDirectoryName("ImagePipelineCacheDefault")
            .setMaxCacheSize(MAX_DISK_CACHE_SIZE)
            .setMaxCacheSizeOnLowDiskSpace(MAX_DISK_CACHE_LOW_SIZE)
            .setMaxCacheSizeOnVeryLowDiskSpace(MAX_DISK_CACHE_VERYLOW_SIZE)
            .setDiskTrimmableRegistry(NoOpDiskTrimmableRegistry.getInstance())
            .build();
}

public static ImagePipelineConfig getDefaultImagePipelineConfig(Context context) {
    final int cacheSize = (int) SharedPreferencesUtil.getData(HViewerApplication.mContext,
            SettingFragment.KEY_PREF_CACHE_SIZE, 300);
    MAX_DISK_CACHE_VERYLOW_SIZE = cacheSize / 5 * ByteConstants.MB;
    MAX_DISK_CACHE_LOW_SIZE = cacheSize * 3 / 5 * ByteConstants.MB;
    MAX_DISK_CACHE_SIZE = cacheSize * ByteConstants.MB;

    //内存配置
    final MemoryCacheParams bitmapCacheParams = new MemoryCacheParams(
            MAX_MEMORY_CACHE_SIZE,          // 内存缓存中总图片的最大大小,以字节为单位。
            Integer.MAX_VALUE,              // 内存缓存中图片的最大数量。
            MAX_MEMORY_CACHE_SIZE,          // 内存缓存中准备清除但尚未被删除的总图片的最大大小,以字节为单位。
            Integer.MAX_VALUE,              // 内存缓存中准备清除的总图片的最大数量。
            Integer.MAX_VALUE);             // 内存缓存中单个图片的最大大小。

    //修改内存图片缓存数量，空间策略（这个方式有点恶心）
    Supplier<MemoryCacheParams> mSupplierMemoryCacheParams = new Supplier<MemoryCacheParams>() {
        @Override
        public MemoryCacheParams get() {
            return bitmapCacheParams;
        }
    };

    //小图片的磁盘配置
    DiskCacheConfig diskSmallCacheConfig = DiskCacheConfig.newBuilder(context)
            .setBaseDirectoryPath(getDiskCacheDir(context))                         //缓存图片基路径
            .setBaseDirectoryName(IMAGE_PIPELINE_SMALL_CACHE_DIR)                   //文件夹名
            .setMaxCacheSize(MAX_DISK_CACHE_SIZE)                                   //默认缓存的最大大小。
            .setMaxCacheSizeOnLowDiskSpace(MAX_SMALL_DISK_LOW_CACHE_SIZE)           //缓存的最大大小,使用设备时低磁盘空间。
            .setMaxCacheSizeOnVeryLowDiskSpace(MAX_SMALL_DISK_VERYLOW_CACHE_SIZE)   //缓存的最大大小,当设备极低磁盘空间
            .setDiskTrimmableRegistry(NoOpDiskTrimmableRegistry.getInstance())
            .build();

    //默认图片的磁盘配置
    DiskCacheConfig diskCacheConfig = DiskCacheConfig.newBuilder(context)
            .setBaseDirectoryPath(getDiskCacheDir(context))//缓存图片基路径
            .setBaseDirectoryName(IMAGE_PIPELINE_CACHE_DIR)                         //文件夹名
            .setMaxCacheSize(MAX_DISK_CACHE_SIZE)                                   //默认缓存的最大大小。
            .setMaxCacheSizeOnLowDiskSpace(MAX_DISK_CACHE_LOW_SIZE)                 //缓存的最大大小,使用设备时低磁盘空间。
            .setMaxCacheSizeOnVeryLowDiskSpace(MAX_DISK_CACHE_VERYLOW_SIZE)         //缓存的最大大小,当设备极低磁盘空间
            .setDiskTrimmableRegistry(NoOpDiskTrimmableRegistry.getInstance())
            .build();

    // 自定义使用okhttp进行请求
    OkHttpClient okHttpClient = new OkHttpClient.Builder()
            .addNetworkInterceptor(new StethoInterceptor())
            .connectTimeout(30, TimeUnit.SECONDS)
            .readTimeout(60, TimeUnit.SECONDS)
            .dns(new HttpDns())
            .build();

    //缓存图片配置
    ImagePipelineConfig.Builder configBuilder = ImagePipelineConfig.newBuilder(context)
            .setBitmapsConfig(Bitmap.Config.RGB_565)
            .setBitmapMemoryCacheParamsSupplier(mSupplierMemoryCacheParams)
            .setSmallImageDiskCacheConfig(diskSmallCacheConfig)
            .setMainDiskCacheConfig(diskCacheConfig)
            .setMemoryTrimmableRegistry(NoOpMemoryTrimmableRegistry.getInstance())
            .setResizeAndRotateEnabledForNetwork(true)
            .setNetworkFetcher(new MyOkHttpNetworkFetcher(okHttpClient));


    // 这段代码用于清理缓存
    NoOpMemoryTrimmableRegistry.getInstance().registerMemoryTrimmable(new MemoryTrimmable() {
        @Override
        public void trim(MemoryTrimType trimType) {
            final double suggestedTrimRatio = trimType.getSuggestedTrimRatio();

            Logger.d("ImagePipeline", String.format("onCreate suggestedTrimRatio : %d", suggestedTrimRatio));
            if (MemoryTrimType.OnCloseToDalvikHeapLimit.getSuggestedTrimRatio() == suggestedTrimRatio
                    || MemoryTrimType.OnSystemLowMemoryWhileAppInBackground.getSuggestedTrimRatio() == suggestedTrimRatio
                    || MemoryTrimType.OnSystemLowMemoryWhileAppInForeground.getSuggestedTrimRatio() == suggestedTrimRatio
                    ) {
                ImagePipelineFactory.getInstance().getImagePipeline().clearMemoryCaches();
            }
        }
    });

    return configBuilder.build();
}