| <!-- |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with |
| the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| --> |
| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> |
| <html> |
| <head> |
| </head> |
| <body> |
| The protocol layer is the central place for handling the fundamental logic and assertions of XMPP stanzas going over a XMPP transport. |
| The protocol layer normally gets fed from the transport layer, but is independent from it (to be easily testable and |
| keeping transports pluggable). |
| <p/> |
| To execute actual command functionality, the protocol layer looks up (using {@link org.apache.vysper.xmpp.protocol.StanzaHandlerLookup}) |
| and hands over control to the appropriate {@link org.apache.vysper.xmpp.protocol.StanzaHandler}. |
| It acts as a state machine for a {@link org.apache.vysper.xmpp.server.SessionContext}. |
| <p/> |
| Essentially, the protocol layer ensures that every XMPP session is in a well-defined state, the fundamental rules of stanza processing are |
| followed, that the appropriate handlers are called and session, transport and connection are working well together. |
| It knows what to do when a session gets closed (unexectedly or expectedly) and handles stream level errors. |
| |
| @see org.apache.vysper.xmpp.protocol.ProtocolWorker |
| @see org.apache.vysper.xmpp.stanza.Stanza |
| @see org.apache.vysper.xmpp.protocol.StanzaHandlerLookup |
| @see org.apache.vysper.xmpp.protocol.StanzaHandler |
| @see org.apache.vysper.xmpp.protocol.StateAwareProtocolWorker |
| </body> |
| </html> |
