public class OioServerSocketChannelFactory extends Object implements ServerSocketChannelFactory
ServerSocketChannelFactory
which creates a server-side blocking
I/O based ServerSocketChannel
. It utilizes the good old blocking
I/O API which is known to yield better throughput and latency when there
are relatively small number of connections to serve.
There are two types of threads in a OioServerSocketChannelFactory
;
one is boss thread and the other is worker thread.
Each bound ServerSocketChannel
has its own boss thread.
For example, if you opened two server ports such as 80 and 443, you will
have two boss threads. A boss thread accepts incoming connections until
the port is unbound. Once a connection is accepted successfully, the boss
thread passes the accepted Channel
to one of the worker
threads that the OioServerSocketChannelFactory
manages.
Each connected Channel
has a dedicated worker thread, just like a
traditional blocking I/O thread model.
All threads are acquired from the Executor
s which were specified
when a OioServerSocketChannelFactory
was created. Boss threads are
acquired from the bossExecutor
, and worker threads are acquired from
the workerExecutor
. Therefore, you should make sure the specified
Executor
s are able to lend the sufficient number of threads.
Both boss and worker threads are acquired lazily, and then released when there's nothing left to process. All the related resources are also released when the boss and worker threads are released. Therefore, to shut down a service gracefully, you should do the following:
ChannelGroup.close()
)releaseExternalResources()
.RejectedExecutionException
and the related resources might not be released properly.
A ServerSocketChannel
created by this factory and its child channels
do not support asynchronous operations. Any I/O requests such as
"write"
will be performed in a blocking manner.
Constructor and Description |
---|
OioServerSocketChannelFactory()
Create a new
OioServerSocketChannelFactory with a Executors.newCachedThreadPool()
for the boss and worker executor. |
OioServerSocketChannelFactory(Executor bossExecutor,
Executor workerExecutor)
Creates a new instance.
|
Modifier and Type | Method and Description |
---|---|
ServerSocketChannel |
newChannel(ChannelPipeline pipeline)
|
void |
releaseExternalResources()
Releases the external resources that this factory depends on to function.
|
public OioServerSocketChannelFactory()
OioServerSocketChannelFactory
with a Executors.newCachedThreadPool()
for the boss and worker executor.
See OioServerSocketChannelFactory(Executor, Executor)
public ServerSocketChannel newChannel(ChannelPipeline pipeline)
ChannelFactory
newChannel
in interface ChannelFactory
newChannel
in interface ServerChannelFactory
newChannel
in interface ServerSocketChannelFactory
pipeline
- the ChannelPipeline
which is going to be
attached to the new Channel
public void releaseExternalResources()
ChannelFactory
Executor
s that you specified in the factory
constructor are external resources. You can call this method to release
all external resources conveniently when the resources are not used by
this factory or any other part of your application. An unexpected
behavior will be resulted in if the resources are released when there's
an open channel which is managed by this factory.releaseExternalResources
in interface ChannelFactory
releaseExternalResources
in interface ExternalResourceReleasable
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