public class NioServerSocketChannelFactory extends Object implements ServerSocketChannelFactory
ServerSocketChannelFactory
which creates a server-side NIO-based
ServerSocketChannel
. It utilizes the non-blocking I/O mode which
was introduced with NIO to serve many number of concurrent connections
efficiently.
There are two types of threads in a NioServerSocketChannelFactory
;
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 NioServerSocketChannelFactory
manages.
One NioServerSocketChannelFactory
can have one or more worker
threads. A worker thread performs non-blocking read and write for one or
more Channel
s in a non-blocking mode.
All threads are acquired from the Executor
s which were specified
when a NioServerSocketChannelFactory
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.
It is the best bet to specify a cached thread pool.
Both boss and worker threads are acquired lazily, and then released when
there's nothing left to process. All the related resources such as
Selector
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.Constructor and Description |
---|
NioServerSocketChannelFactory()
Create a new
NioServerSocketChannelFactory using Executors.newCachedThreadPool()
for the boss and worker. |
NioServerSocketChannelFactory(Executor bossExecutor,
Executor workerExecutor)
Creates a new instance.
|
NioServerSocketChannelFactory(Executor bossExecutor,
Executor workerExecutor,
int workerCount)
Creates a new instance.
|
NioServerSocketChannelFactory(Executor bossExecutor,
WorkerPool<NioWorker> workerPool)
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 NioServerSocketChannelFactory()
NioServerSocketChannelFactory
using Executors.newCachedThreadPool()
for the boss and worker.
See NioServerSocketChannelFactory(Executor, Executor)
public NioServerSocketChannelFactory(Executor bossExecutor, Executor workerExecutor)
NioServerSocketChannelFactory(Executor, Executor, int)
with 2 *
the number of available processors in the machine. The number of
available processors is obtained by Runtime.availableProcessors()
.public NioServerSocketChannelFactory(Executor bossExecutor, Executor workerExecutor, int workerCount)
public NioServerSocketChannelFactory(Executor bossExecutor, WorkerPool<NioWorker> workerPool)
bossExecutor
- the Executor
which will execute the boss threadsworkerPool
- the WorkerPool
which will be used to obtain the NioWorker
that execute
the I/O worker threadspublic 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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