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Keep strong references to the FileSource/OfflineManager operations callbacks #14601
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[android] use strong references to the offline merge callbacks
LukasPaczos 8cd56c7
[android] FileUtils read/write permission check tasks retain a strong…
LukasPaczos eba2f25
[android] keep strong callback reference and use application context …
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Original file line number | Diff line number | Diff line change |
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@@ -2,11 +2,12 @@ | |
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import android.annotation.SuppressLint; | ||
import android.content.Context; | ||
import android.os.AsyncTask; | ||
import android.os.Handler; | ||
import android.os.Looper; | ||
import android.support.annotation.AnyThread; | ||
import android.support.annotation.Keep; | ||
import android.support.annotation.NonNull; | ||
import android.support.annotation.UiThread; | ||
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import com.mapbox.mapboxsdk.LibraryLoader; | ||
import com.mapbox.mapboxsdk.Mapbox; | ||
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@@ -21,7 +22,6 @@ | |
import java.io.FileInputStream; | ||
import java.io.FileOutputStream; | ||
import java.io.IOException; | ||
import java.lang.ref.WeakReference; | ||
import java.nio.channels.FileChannel; | ||
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/** | ||
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@@ -32,6 +32,7 @@ | |
* | ||
* @see <a href="https://docs.mapbox.com/help/troubleshooting/mobile-offline/">Offline Maps Information/</a> | ||
*/ | ||
@UiThread | ||
public class OfflineManager { | ||
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private static final String TAG = "Mbgl - OfflineManager"; | ||
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@@ -156,6 +157,7 @@ public static synchronized OfflineManager getInstance(@NonNull Context context) | |
return instance; | ||
} | ||
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@AnyThread | ||
private Handler getHandler() { | ||
if (handler == null) { | ||
handler = new Handler(Looper.getMainLooper()); | ||
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@@ -205,6 +207,8 @@ public void run() { | |
* Merge offline regions from a secondary database into the main offline database. | ||
* <p> | ||
* When the merge is completed, or fails, the {@link MergeOfflineRegionsCallback} will be invoked on the main thread. | ||
* The callback reference is <b>strongly kept</b> throughout the process, | ||
* so it needs to be wrapped in a weak reference or released on the client side if necessary. | ||
* <p> | ||
* The secondary database may need to be upgraded to the latest schema. | ||
* This is done in-place and requires write-access to the provided path. | ||
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@@ -225,73 +229,50 @@ public void run() { | |
*/ | ||
public void mergeOfflineRegions(@NonNull String path, @NonNull final MergeOfflineRegionsCallback callback) { | ||
final File src = new File(path); | ||
new FileUtils.CheckFileReadPermissionTask(new FileUtils.OnCheckFileReadPermissionListener() { | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. I'm happy to keep the async tasks and convert them to use strong references, but I think that proposed, streamlined setup is actually easier to read. |
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new Thread(new Runnable() { | ||
@Override | ||
public void onReadPermissionGranted() { | ||
new FileUtils.CheckFileWritePermissionTask(new FileUtils.OnCheckFileWritePermissionListener() { | ||
@Override | ||
public void onWritePermissionGranted() { | ||
// path writable, merge and update schema in place if necessary | ||
mergeOfflineDatabaseFiles(src, callback, false); | ||
} | ||
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@Override | ||
public void onError() { | ||
// path not writable, copy the the file to temp directory, then merge and update schema on a copy if | ||
// necessary | ||
File dst = new File(FileSource.getInternalCachePath(context), src.getName()); | ||
new CopyTempDatabaseFileTask(OfflineManager.this, callback).execute(src, dst); | ||
public void run() { | ||
String errorMessage = null; | ||
if (src.canWrite()) { | ||
getHandler().post(new Runnable() { | ||
@Override | ||
public void run() { | ||
// path writable, merge and update schema in place if necessary | ||
mergeOfflineDatabaseFiles(src, callback, false); | ||
} | ||
}); | ||
} else if (src.canRead()) { | ||
// path not writable, copy the the file to temp directory | ||
final File dst = new File(FileSource.getInternalCachePath(context), src.getName()); | ||
try { | ||
copyTempDatabaseFile(src, dst); | ||
getHandler().post(new Runnable() { | ||
@Override | ||
public void run() { | ||
// merge and update schema using the copy | ||
OfflineManager.this.mergeOfflineDatabaseFiles(dst, callback, true); | ||
} | ||
}); | ||
} catch (IOException ex) { | ||
ex.printStackTrace(); | ||
errorMessage = ex.getMessage(); | ||
} | ||
}).execute(src); | ||
} | ||
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@Override | ||
public void onError() { | ||
// path not readable, abort | ||
callback.onError("Secondary database needs to be located in a readable path."); | ||
} | ||
}).execute(src); | ||
} | ||
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private static final class CopyTempDatabaseFileTask extends AsyncTask<Object, Void, Object> { | ||
@NonNull | ||
private final WeakReference<OfflineManager> offlineManagerWeakReference; | ||
@NonNull | ||
private final WeakReference<MergeOfflineRegionsCallback> callbackWeakReference; | ||
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CopyTempDatabaseFileTask(OfflineManager offlineManager, MergeOfflineRegionsCallback callback) { | ||
this.offlineManagerWeakReference = new WeakReference<>(offlineManager); | ||
this.callbackWeakReference = new WeakReference<>(callback); | ||
} | ||
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@Override | ||
protected Object doInBackground(Object... objects) { | ||
File src = (File) objects[0]; | ||
File dst = (File) objects[1]; | ||
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try { | ||
copyTempDatabaseFile(src, dst); | ||
return dst; | ||
} catch (IOException ex) { | ||
return ex.getMessage(); | ||
} | ||
} | ||
} else { | ||
// path not readable, abort | ||
errorMessage = "Secondary database needs to be located in a readable path."; | ||
} | ||
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@Override | ||
protected void onPostExecute(Object object) { | ||
MergeOfflineRegionsCallback callback = callbackWeakReference.get(); | ||
if (callback != null) { | ||
OfflineManager offlineManager = offlineManagerWeakReference.get(); | ||
if (object instanceof File && offlineManager != null) { | ||
// successfully copied the file, perform merge | ||
File dst = (File) object; | ||
offlineManager.mergeOfflineDatabaseFiles(dst, callback, true); | ||
} else if (object instanceof String) { | ||
// error occurred | ||
callback.onError((String) object); | ||
if (errorMessage != null) { | ||
final String finalErrorMessage = errorMessage; | ||
getHandler().post(new Runnable() { | ||
@Override | ||
public void run() { | ||
callback.onError(finalErrorMessage); | ||
} | ||
}); | ||
} | ||
} | ||
} | ||
}).start(); | ||
} | ||
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private static void copyTempDatabaseFile(@NonNull File sourceFile, File destFile) throws IOException { | ||
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@@ -324,27 +305,27 @@ private void mergeOfflineDatabaseFiles(@NonNull final File file, @NonNull final | |
mergeOfflineRegions(fileSource, file.getAbsolutePath(), new MergeOfflineRegionsCallback() { | ||
@Override | ||
public void onMerge(final OfflineRegion[] offlineRegions) { | ||
if (isTemporaryFile) { | ||
file.delete(); | ||
} | ||
getHandler().post(new Runnable() { | ||
@Override | ||
public void run() { | ||
fileSource.deactivate(); | ||
if (isTemporaryFile) { | ||
file.delete(); | ||
} | ||
callback.onMerge(offlineRegions); | ||
} | ||
}); | ||
} | ||
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@Override | ||
public void onError(final String error) { | ||
if (isTemporaryFile) { | ||
file.delete(); | ||
} | ||
getHandler().post(new Runnable() { | ||
@Override | ||
public void run() { | ||
fileSource.deactivate(); | ||
if (isTemporaryFile) { | ||
file.delete(); | ||
} | ||
callback.onError(error); | ||
} | ||
}); | ||
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Do we want to "recommend" to wrap it into a
WeakReference
after 👀 the issues that may cause https://github.com/mapbox/mapbox-gl-native/pull/14601/files#r282389769?There was a problem hiding this comment.
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Let's leave this up to the discretion of the implementation needs 🙃