zookeeper-server/src/main/java/org/apache/zookeeper/server/NIOServerCnxn.java [709:731]:
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    @Override
    public void process(WatchedEvent event, List<ACL> znodeAcl) {
        try {
            zkServer.checkACL(this, znodeAcl, ZooDefs.Perms.READ, getAuthInfo(), event.getPath(), null);
        } catch (KeeperException.NoAuthException e) {
            if (LOG.isTraceEnabled()) {
                ZooTrace.logTraceMessage(
                    LOG,
                    ZooTrace.EVENT_DELIVERY_TRACE_MASK,
                    "Not delivering event " + event + " to 0x" + Long.toHexString(this.sessionId) + " (filtered by ACL)");
            }
            return;
        }
        ReplyHeader h = new ReplyHeader(ClientCnxn.NOTIFICATION_XID, event.getZxid(), 0);
        if (LOG.isTraceEnabled()) {
            ZooTrace.logTraceMessage(
                LOG,
                ZooTrace.EVENT_DELIVERY_TRACE_MASK,
                "Deliver event " + event + " to 0x" + Long.toHexString(this.sessionId) + " through " + this);
        }

        // Convert WatchedEvent to a type that can be sent over the wire
        WatcherEvent e = event.getWrapper();
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zookeeper-server/src/main/java/org/apache/zookeeper/server/NettyServerCnxn.java [167:189]:
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    @Override
    public void process(WatchedEvent event, List<ACL> znodeAcl) {
        try {
            zkServer.checkACL(this, znodeAcl, ZooDefs.Perms.READ, getAuthInfo(), event.getPath(), null);
        } catch (KeeperException.NoAuthException e) {
            if (LOG.isTraceEnabled()) {
                ZooTrace.logTraceMessage(
                    LOG,
                    ZooTrace.EVENT_DELIVERY_TRACE_MASK,
                    "Not delivering event " + event + " to 0x" + Long.toHexString(this.sessionId) + " (filtered by ACL)");
            }
            return;
        }
        ReplyHeader h = new ReplyHeader(ClientCnxn.NOTIFICATION_XID, event.getZxid(), 0);
        if (LOG.isTraceEnabled()) {
            ZooTrace.logTraceMessage(
                LOG,
                ZooTrace.EVENT_DELIVERY_TRACE_MASK,
                "Deliver event " + event + " to 0x" + Long.toHexString(this.sessionId) + " through " + this);
        }

        // Convert WatchedEvent to a type that can be sent over the wire
        WatcherEvent e = event.getWrapper();
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