MockRequestHandler.java 文件源码

@Override public Result load(Request request, int networkPolicy) throws IOException {
    String imagePath = request.uri.getPath().substring(1); // Grab only the path sans leading slash.

    // Check the disk cache for the image. A non-null return value indicates a hit.
    boolean cacheHit = emulatedDiskCache.get(imagePath) != null;

    // If there's a hit, grab the image stream and return it.
    if (cacheHit) {
        return new Result(loadBitmap(imagePath), Picasso.LoadedFrom.DISK);
    }

    // If we are not allowed to hit the network and the cache missed return a big fat nothing.
    if (NetworkPolicy.isOfflineOnly(networkPolicy)) {
        return null;
    }

    // If we got this far there was a cache miss and hitting the network is required. See if we need
    // to fake an network error.
    if (behavior.calculateIsFailure()) {
        SystemClock.sleep(behavior.calculateDelay(MILLISECONDS));
        throw new IOException("Fake network error!");
    }

    // We aren't throwing a network error so fake a round trip delay.
    SystemClock.sleep(behavior.calculateDelay(MILLISECONDS));

    // Since we cache missed put it in the LRU.
    AssetFileDescriptor fileDescriptor = assetManager.openFd(imagePath);
    long size = fileDescriptor.getLength();
    fileDescriptor.close();
    emulatedDiskCache.put(imagePath, size);

    // Grab the image stream and return it.
    return new Result(loadBitmap(imagePath), Picasso.LoadedFrom.NETWORK);
}