gistfile1.java

public class ChainImageCache implements ImageCache {
	private ImageCache fastCache, slowCache;
 
	public ChainImageCache(ImageCache fastCache, ImageCache slowCache) {
		this.fastCache = fastCache;
		this.slowCache = slowCache;
	}
 
	@Override
	public Bitmap getBitmap(String url) {
		Bitmap b = fastCache.getBitmap(url);
		if(b == null)
			b = slowCache.getBitmap(url);
		return b;
	}
 
	@Override
	public void putBitmap(String url, Bitmap bitmap) {
		fastCache.putBitmap(url, bitmap);
		slowCache.putBitmap(url, bitmap);
	}
 
}