-
Notifications
You must be signed in to change notification settings - Fork 5
Technical Notes
Ryan Slominski edited this page Oct 16, 2017
·
9 revisions
- Accessing request metadata such as determining the client IP address or request headers (User Agent, X-Forwarded-For, etc.) in a web socket server end point is not well defined by the spec and is generally Application Server (Tomcat vs GlassFish vs Wildfly, etc.) dependent. A complex ThreadLocal approach can be used to avoid proprietary approaches: https://github.com/javaee/websocket-spec/issues/235.
- Writes (both Synchronous and Asynchronous) are not required to be thread safe per specification. Most implementations are though as it makes sense that it would be. Tomcat is a notable exception: https://bz.apache.org/bugzilla/show_bug.cgi?id=56026. In Tomcat all writes must be externally synchronized on the session if multiple threads are writing.
- The server side API does not handle ping/pong automatically and simply exposes a method for manually sending a ping and listening for a pong. This means you must create your own timer thread: https://github.com/javaee/websocket-spec/issues/176