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In Netty 3, downstream writes of SPDY data frames and upstream reads of SPDY window udpate frames occur on different threads. When receiving a window update frame, we synchronize on a java object (SpdySessionHandler::flowControlLock) while sending any pending writes that are now able to complete. When writing a data frame, we check the send window size to see if we are allowed to write it to the socket, or if we have to enqueue it as a pending write. To prevent races with the window update frame, this is also synchronized on the same SpdySessionHandler::flowControlLock. In Netty 4, upstream and downstream operations on any given channel now occur on the same thread. Since java locks are re-entrant, this now allows downstream writes to occur while processing window update frames. In particular, when we receive a window update frame that unblocks a pending write, this write completes which triggers an event notification on the response, which in turn triggers a write of a data frame. Since this is on the same thread it re-enters the lock and modifies the send window. When the write completes, we continue processing pending writes without knowledge that the window size has been decremented. |
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| all | ||
| buffer | ||
| codec | ||
| codec-dns | ||
| codec-haproxy | ||
| codec-http | ||
| codec-memcache | ||
| codec-mqtt | ||
| codec-socks | ||
| codec-stomp | ||
| common | ||
| example | ||
| handler | ||
| license | ||
| microbench | ||
| tarball | ||
| testsuite | ||
| transport | ||
| transport-native-epoll | ||
| transport-rxtx | ||
| transport-sctp | ||
| transport-udt | ||
| .fbprefs | ||
| .gitignore | ||
| .travis.yml | ||
| CONTRIBUTING.md | ||
| LICENSE.txt | ||
| NOTICE.txt | ||
| pom.xml | ||
| README.md | ||
| run-example.sh | ||
Netty Project
Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.
Links
How to build
For the detailed information about building and developing Netty, please visit the developer guide. This page only gives very basic information.
You require the following to build Netty:
- Latest stable Oracle JDK 7
- Latest stable Apache Maven
- If you are on Linux, you need additional development packages installed on your system, because you'll build the native transport.
Note that this is build-time requirement. JDK 5 (for 3.x) or 6 (for 4.0+) is enough to run your Netty-based application.
Branches to look
The 'master' branch is where the development of the latest major version lives on. The development of all other versions takes place in each branch whose name is identical to <majorVersion>.<minorVersion>. For example, the development of 3.9 and 4.0 resides in the branch '3.9' and the branch '4.0' respectively.