/** Commit and save all changes, if there are any, and compact the storage if needed. */
public void writeInBackground(int autoCommitDelay) {
if (closed) {
return;
}
// could also commit when there are many unsaved pages,
// but according to a test it doesn't really help
long time = getTimeSinceCreation();
if (time <= lastCommitTime + autoCommitDelay) {
return;
}
if (hasUnsavedChanges()) {
try {
commitAndSave();
} catch (Exception e) {
if (backgroundExceptionHandler != null) {
backgroundExceptionHandler.uncaughtException(null, e);
return;
}
}
}
if (autoCompactFillRate > 0 && lastChunk != null && lastChunk.fileStorage != null) {
FileStorage fileStorage = lastChunk.fileStorage;
try {
// whether there were file read or write operations since
// the last time
boolean fileOps;
long fileOpCount = fileStorage.getWriteCount() + fileStorage.getReadCount();
if (autoCompactLastFileOpCount != fileOpCount) {
fileOps = true;
} else {
fileOps = false;
}
// use a lower fill rate if there were any file operations
int fillRate = fileOps ? autoCompactFillRate / 3 : autoCompactFillRate;
// TODO how to avoid endless compaction if there is a bug
// in the bookkeeping?
compact(fillRate, autoCommitMemory);
autoCompactLastFileOpCount = fileStorage.getWriteCount() + fileStorage.getReadCount();
} catch (Exception e) {
if (backgroundExceptionHandler != null) {
backgroundExceptionHandler.uncaughtException(null, e);
}
}
}
}
