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Expose image cache interrogation to JS

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Summary: Add a static `Image.queryCache` function that can query multiple URLs at once. The result is a map where each URL that is in cache is mapped to the cache type (memory/disk). URLs that are not cached do not appear in the result.

Reviewed By: lexs

Differential Revision: D3791333

fbshipit-source-id: b183015d97423f0c095bf891f035dac2e23d8d11
This commit is contained in:
Felix Oghina 2016-08-31 05:06:10 -07:00 committed by Facebook Github Bot
parent d3282e3bb1
commit 69c889815e
2 changed files with 36 additions and 0 deletions
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11
Libraries/Image/Image.android.js
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@ -185,6 +185,17 @@ var Image = React.createClass({
abortPrefetch(requestId: number) {
ImageLoader.abortRequest(requestId);
},
/**
* Perform cache interrogation.
*
* @param urls the list of image URLs to check the cache for.
* @return a mapping from url to cache status, such as "disk" or "memory". If a requested URL is
* not in the mapping, it means it's not in the cache.
*/
async queryCache(urls: Array<string>): Promise<Map<string, 'memory' | 'disk'>> {
return await ImageLoader.queryCache(urls);
}
},
mixins: [NativeMethodsMixin],

25
ReactAndroid/src/main/java/com/facebook/react/modules/image/ImageLoaderModule.java
View File

@ -20,15 +20,18 @@ import com.facebook.datasource.BaseDataSubscriber;
import com.facebook.datasource.DataSource;
import com.facebook.datasource.DataSubscriber;
import com.facebook.drawee.backends.pipeline.Fresco;
import com.facebook.imagepipeline.core.ImagePipeline;
import com.facebook.imagepipeline.image.CloseableImage;
import com.facebook.imagepipeline.request.ImageRequest;
import com.facebook.imagepipeline.request.ImageRequestBuilder;
import com.facebook.react.bridge.Arguments;
import com.facebook.react.bridge.GuardedAsyncTask;
import com.facebook.react.bridge.LifecycleEventListener;
import com.facebook.react.bridge.Promise;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.bridge.ReadableArray;
import com.facebook.react.bridge.WritableMap;
public class ImageLoaderModule extends ReactContextBaseJavaModule implements
@ -175,6 +178,28 @@ public class ImageLoaderModule extends ReactContextBaseJavaModule implements
}
}
@ReactMethod
public void queryCache(final ReadableArray uris, final Promise promise) {
// perform cache interrogation in async task as disk cache checks are expensive
new GuardedAsyncTask<Void, Void>(getReactApplicationContext()) {
@Override
protected void doInBackgroundGuarded(Void... params) {
WritableMap result = Arguments.createMap();
ImagePipeline imagePipeline = Fresco.getImagePipeline();
for (int i = 0; i < uris.size(); i++) {
String uriString = uris.getString(i);
final Uri uri = Uri.parse(uriString);
if (imagePipeline.isInBitmapMemoryCache(uri)) {
result.putString(uriString, "memory");
} else if (imagePipeline.isInDiskCacheSync(uri)) {
result.putString(uriString, "disk");
}
}
promise.resolve(result);
}
}.executeOnExecutor(GuardedAsyncTask.THREAD_POOL_EXECUTOR);
}
private void registerRequest(int requestId, DataSource<Void> request) {
synchronized (mEnqueuedRequestMonitor) {
mEnqueuedRequests.put(requestId, request);