Example usage for org.apache.zookeeper Watcher process

Introduction

In this page you can find the example usage for org.apache.zookeeper Watcher process.

Prototype

void process(WatchedEvent event);

Source Link

Usage

From source file:org.midonet.midolman.state.MockDirectory.java

License:Apache License

@Override
public List<OpResult> multi(List<Op> ops) throws InterruptedException, KeeperException {
    List<OpResult> results = new ArrayList<OpResult>();
    // Fire watchers after finishing multi operation.
    // Copy to the local Set to avoid concurrent access.
    Map<Watcher, WatchedEvent> watchers = new HashMap<Watcher, WatchedEvent>();
    try {//from  w ww .j  ava2s  .c  o m
        for (Op op : ops) {
            Record record = op.toRequestRecord();
            if (record instanceof CreateRequest) {
                // TODO(pino, ryu): should we use the try/catch and create
                // new ErrorResult? Don't for now, but this means that the
                // unit tests can't purposely make a bad Op.
                // try {
                CreateRequest req = CreateRequest.class.cast(record);
                String path = this.add(req.getPath(), req.getData(), CreateMode.fromFlag(req.getFlags()), true);
                results.add(new OpResult.CreateResult(path));
                // } catch (KeeperException e) {
                // e.printStackTrace();
                // results.add(
                // new OpResult.ErrorResult(e.code().intValue()));
                // }
            } else if (record instanceof SetDataRequest) {
                SetDataRequest req = SetDataRequest.class.cast(record);
                this.update(req.getPath(), req.getData(), true);
                // We create the SetDataResult with Stat=null. The
                // Directory interface doesn't provide the Stat object.
                results.add(new OpResult.SetDataResult(null));
            } else if (record instanceof DeleteRequest) {
                DeleteRequest req = DeleteRequest.class.cast(record);
                this.delete(req.getPath(), true);
                results.add(new OpResult.DeleteResult());
            } else {
                // might be CheckVersionRequest or some new type we miss.
                throw new IllegalArgumentException(
                        "This mock implementation only supports Create, " + "SetData and Delete operations");
            }
        }
    } finally {
        synchronized (multiDataWatchers) {
            watchers.putAll(multiDataWatchers);
            multiDataWatchers.clear();
        }
    }

    for (Watcher watcher : watchers.keySet()) {
        watcher.process(watchers.get(watcher));
    }

    return results;
}