no message buffer throw exception or drop message directly?

Top push server hold fixed buffer area, if no buffer to use, return NoMessageBufferException.

server is design to handle c10K+ clients, max flush 1000 messages once per client for balance.

state builder idle time and client how busy affect message RETAIN time

https://github.com/wsky/top-push/blob/master/src/main/java/com/tmall/top/push/PushManager.java#L171

https://github.com/wsky/top-push/blob/master/src/main/java/com/tmall/top/push/PushManager.java#L209

private void rebuildClientsState(Client client, boolean noPending,
            boolean pending, boolean offline) {
        if (noPending && pending && !offline) {
            this.pendingClients.add(client);
            this.idleClients.remove(client.getId());
            this.offlineClients.remove(client.getId());
            if (this.stateHandler != null)
                this.stateHandler.onClientPending(client);
        } else if (!pending && !offline) {
            this.idleClients.put(client.getId(), client);
            this.offlineClients.remove(client.getId());
            if (this.stateHandler != null)
                this.stateHandler.onClientIdle(client);
        } else if (offline) {
            // TODO:clear pending messages of offline client after
            // a long time
            this.offlineClients.put(client.getId(), client);
            this.idleClients.remove(client.getId());
            if (this.stateHandler != null)
                this.stateHandler.onClientOffline(client);
        }
    }

wsky / top-push

no message buffer throw exception or drop message directly? #23