NewPipe/app/src/main/java/org/schabi/newpipe/NewPipeDatabase.java

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package org.schabi.newpipe;
import android.content.Context;
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import android.database.Cursor;
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import androidx.annotation.NonNull;
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import androidx.room.Room;
import org.schabi.newpipe.database.AppDatabase;
import static org.schabi.newpipe.database.AppDatabase.DATABASE_NAME;
import static org.schabi.newpipe.database.Migrations.MIGRATION_1_2;
import static org.schabi.newpipe.database.Migrations.MIGRATION_2_3;
public final class NewPipeDatabase {
private static volatile AppDatabase databaseInstance;
private NewPipeDatabase() {
//no instance
}
private static AppDatabase getDatabase(final Context context) {
return Room
.databaseBuilder(context.getApplicationContext(), AppDatabase.class, DATABASE_NAME)
.addMigrations(MIGRATION_1_2, MIGRATION_2_3)
.build();
}
@NonNull
public static AppDatabase getInstance(@NonNull final Context context) {
AppDatabase result = databaseInstance;
if (result == null) {
synchronized (NewPipeDatabase.class) {
result = databaseInstance;
if (result == null) {
databaseInstance = getDatabase(context);
result = databaseInstance;
}
}
}
return result;
}
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public static void checkpoint() {
if (databaseInstance == null) {
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throw new IllegalStateException("database is not initialized");
}
Cursor c = databaseInstance.query("pragma wal_checkpoint(full)", null);
if (c.moveToFirst() && c.getInt(0) == 1) {
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throw new RuntimeException("Checkpoint was blocked from completing");
}
}
}