protected void prepare()

in java/com/facebook/soloader/UnpackingSoSource.java [507:539]

• 24 lines of code
• 4 McCabe index (conditional complexity)

  protected void prepare(int flags) throws IOException {
    SysUtil.mkdirOrThrow(soDirectory);

    // LOCK_FILE_NAME is used to synchronize changes in the dso store.
    File lockFileName = new File(soDirectory, LOCK_FILE_NAME);
    FileLocker lock = getOrCreateLock(lockFileName, true);

    // INSTANCE_LOCK_FILE_NAME is used to signal to other processes/threads that
    // there is an initialized SoSource from which DSOs might be getting loaded.
    // This lock is held for the entire lifetime of the process.
    // This prevents from doing changes to DSOs which might prevent previously
    // initialized SoSources from loading libraries.
    if (mInstanceLock == null) {
      File instanceLockFileName = new File(soDirectory, INSTANCE_LOCK_FILE_NAME);
      mInstanceLock = getOrCreateLock(instanceLockFileName, false);
    }

    try {
      Log.v(TAG, "locked dso store " + soDirectory);
      if (refreshLocked(lock, flags, getDepsBlock())) {
        lock = null; // Lock transferred to syncer thread
      } else {
        Log.i(TAG, "dso store is up-to-date: " + soDirectory);
      }
    } finally {
      if (lock != null) {
        Log.v(TAG, "releasing dso store lock for " + soDirectory);
        lock.close();
      } else {
        Log.v(TAG, "not releasing dso store lock for " + soDirectory + " (syncer thread started)");
      }
    }
  }