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338 changes: 181 additions & 157 deletions
338
app/src/main/java/one/mixin/android/db/MessageProvider.kt
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17 changes: 17 additions & 0 deletions
17
app/src/main/java/one/mixin/android/extension/LiveDataExtension.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| package one.mixin.android.extension | ||
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| import androidx.lifecycle.LifecycleOwner | ||
| import androidx.lifecycle.LiveData | ||
| import androidx.lifecycle.Observer | ||
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| fun <T> LiveData<T>.observeOnce(lifecycleOwner: LifecycleOwner, observer: Observer<T>) { | ||
| observe( | ||
| lifecycleOwner, | ||
| object : Observer<T> { | ||
| override fun onChanged(t: T?) { | ||
| observer.onChanged(t) | ||
| removeObserver(this) | ||
| } | ||
| } | ||
| ) | ||
| } |
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102 changes: 102 additions & 0 deletions
102
app/src/main/java/one/mixin/android/util/chat/FixedLimitOffsetDataSource.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| package one.mixin.android.util.chat; | ||
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| import android.annotation.SuppressLint; | ||
| import android.database.Cursor; | ||
| import androidx.annotation.NonNull; | ||
| import androidx.annotation.Nullable; | ||
| import androidx.annotation.RestrictTo; | ||
| import androidx.paging.PositionalDataSource; | ||
| import androidx.room.InvalidationTracker; | ||
| import androidx.room.RoomDatabase; | ||
| import androidx.room.RoomSQLiteQuery; | ||
| import timber.log.Timber; | ||
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| import java.util.List; | ||
| import java.util.Set; | ||
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| @SuppressLint("RestrictedApi") | ||
| @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP) | ||
| public abstract class FixedLimitOffsetDataSource<T> extends PositionalDataSource<T> { | ||
| private final static int FIXED_LOAD_SIZE = 45; | ||
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| private final RoomSQLiteQuery mSourceQuery; | ||
| private final String mLimitOffsetQuery; | ||
| private final int mTotalCount; | ||
| private final RoomDatabase mDb; | ||
| @SuppressWarnings("FieldCanBeLocal") | ||
| private final InvalidationTracker.Observer mObserver; | ||
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| protected FixedLimitOffsetDataSource(RoomDatabase db, RoomSQLiteQuery query, int unreadCount, String... tables) { | ||
| mDb = db; | ||
| mTotalCount = unreadCount + FIXED_LOAD_SIZE / 2; | ||
| mSourceQuery = query; | ||
| mLimitOffsetQuery = "SELECT * FROM ( " + mSourceQuery.getSql() + " ) LIMIT ? OFFSET ?"; | ||
| mObserver = new InvalidationTracker.Observer(tables) { | ||
| @Override | ||
| public void onInvalidated(@NonNull Set<String> tables) { | ||
| invalidate(); | ||
| } | ||
| }; | ||
| db.getInvalidationTracker().addWeakObserver(mObserver); | ||
| } | ||
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| @Override | ||
| public boolean isInvalid() { | ||
| mDb.getInvalidationTracker().refreshVersionsSync(); | ||
| return super.isInvalid(); | ||
| } | ||
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| @SuppressWarnings("WeakerAccess") | ||
| protected abstract List<T> convertRows(Cursor cursor); | ||
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| private List<T> initialList; | ||
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| @Override | ||
| public void loadInitial(@NonNull LoadInitialParams params, | ||
| @NonNull LoadInitialCallback<T> callback) { | ||
| final int firstLoadPosition = computeInitialLoadPosition(params, mTotalCount); | ||
| final int firstLoadSize = computeInitialLoadSize(params, firstLoadPosition, mTotalCount); | ||
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| initialList = loadRange(firstLoadPosition, firstLoadSize); | ||
| if (initialList != null) { | ||
| try { | ||
| callback.onResult(initialList, firstLoadPosition, mTotalCount); | ||
| } catch (IllegalArgumentException e) { | ||
| // workaround with paging initial load size NOT to be a multiple of page size | ||
| Timber.w(e); | ||
| try { | ||
| callback.onResult(initialList, firstLoadPosition, firstLoadPosition + initialList.size()); | ||
| } catch (IllegalArgumentException iae) { | ||
| // workaround with paging incorrect tiling | ||
| Timber.w(iae); | ||
| } | ||
| } | ||
| } else { | ||
| // null list, or size doesn't match request - DB modified between count and load | ||
| invalidate(); | ||
| } | ||
| } | ||
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| @Override | ||
| public void loadRange(@NonNull LoadRangeParams params, | ||
| @NonNull LoadRangeCallback<T> callback) { | ||
| // Left empty | ||
| } | ||
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| @Nullable | ||
| public List<T> loadRange(int startPosition, int loadCount) { | ||
| final RoomSQLiteQuery sqLiteQuery = RoomSQLiteQuery.acquire(mLimitOffsetQuery, | ||
| mSourceQuery.getArgCount() + 2); | ||
| sqLiteQuery.copyArgumentsFrom(mSourceQuery); | ||
| sqLiteQuery.bindLong(sqLiteQuery.getArgCount() - 1, loadCount); | ||
| sqLiteQuery.bindLong(sqLiteQuery.getArgCount(), startPosition); | ||
| Cursor cursor = mDb.query(sqLiteQuery); | ||
| //noinspection TryFinallyCanBeTryWithResources | ||
| try { | ||
| return convertRows(cursor); | ||
| } finally { | ||
| cursor.close(); | ||
| sqLiteQuery.release(); | ||
| } | ||
| } | ||
| } |
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