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Code Issues Releases Wiki Activity

DB process lock

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M66B 2024-05-13 21:13:33 +02:00
parent a906750374
commit 6a9091d596
1 changed files with 37 additions and 0 deletions
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37
app/src/main/java/eu/faircode/email/DB.java
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@ -30,7 +30,9 @@ import org.json.JSONException;
import org.json.JSONObject;
import java.io.File;
import java.io.FileOutputStream;
import java.lang.reflect.Field;
import java.nio.channels.FileLock;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
@ -123,6 +125,7 @@ public abstract class DB extends RoomDatabase {
static final String DB_NAME = "fairemail";
static final int DEFAULT_QUERY_THREADS = 4; // AndroidX default thread count: 4
static final int DEFAULT_CACHE_SIZE = 20; // percentage of memory class
private static final long DB_LOCK_TIMEOUT = 60 * 1000L;
private static final int DB_JOURNAL_SIZE_LIMIT = 1048576; // requery/sqlite-android default
private static final int DB_CHECKPOINT = 1000; // requery/sqlite-android default
@ -425,6 +428,40 @@ public abstract class DB extends RoomDatabase {
Log.d("ROOM invalidated=" + TextUtils.join(",", tables));
}
});
// Ref: https://android-review.googlesource.com/c/platform/frameworks/support/+/1797472
Log.i("DB critical section start");
File dbDir = context.getDatabasePath(DB_NAME).getParentFile();
dbDir.mkdirs();
File lockFile = new File(dbDir, DB_NAME + ".lock");
try (FileOutputStream fos = new FileOutputStream(lockFile)) {
ObjectHolder<FileLock> lock = new ObjectHolder<>(null);
try {
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
try {
lock.value = fos.getChannel().lock();
} catch (Throwable ex) {
Log.e(ex);
}
}
});
thread.start();
thread.join(DB_LOCK_TIMEOUT);
if (thread.isAlive())
throw new IllegalArgumentException("DB critical section failed");
// Force migration
sInstance.getOpenHelper().getWritableDatabase();
} finally {
if (lock.value != null)
lock.value.release();
}
} catch (Throwable ex) {
Log.e(ex);
}
Log.i("DB critical section end");
}
return sInstance;