@Test
public void serverNotEnoughWorkerThreadsCausesBindTimerToCloseChannel() throws Exception {
BlockThreadSmppServerHandler serverHandler0 = new BlockThreadSmppServerHandler();
SmppServerConfiguration configuration = createSmppServerConfiguration();
// permit up to 0.5 seconds to bind
configuration.setBindTimeout(500);
DefaultSmppServer server0 = new DefaultSmppServer(configuration, serverHandler0);
server0.start();
try {
// there is an issue without telling the server how many worker threads
// to create beforehand with starvation only Runtime.getRuntime().availableProcessors()
// worker threads are created by default!!! (yikes)
int workersToStarveWith = Runtime.getRuntime().availableProcessors();
// initiate bind requests on all sessions we care about -- this should
// technicaly "starve" the server of worker threads since they'll all
// be blocked in a Thread.sleep
for (int i = 0; i < workersToStarveWith; i++) {
DefaultSmppClient client0 = new DefaultSmppClient();
SmppSessionConfiguration sessionConfig0 = createDefaultConfiguration();
sessionConfig0.setName("WorkerTest.Session." + i);
// don't use default method of binding, connect the socket first
DefaultSmppSession session0 =
client0.doOpen(sessionConfig0, new DefaultSmppSessionHandler());
// try to bind and execute a bind request and wait for a bind response
BaseBind bindRequest = client0.createBindRequest(sessionConfig0);
try {
// just send the request without caring if it succeeds
session0.sendRequestPdu(bindRequest, 2000, false);
} catch (SmppChannelException e) {
System.out.println(e.getMessage());
}
}
// now try to bind normally -- since all previous workers are "starved"
// this should fail to bind and the socket closed by the "BindTimer"
DefaultSmppClient client0 = new DefaultSmppClient();
SmppSessionConfiguration sessionConfig0 = createDefaultConfiguration();
sessionConfig0.setName("WorkerTestChannelClosed.Session");
sessionConfig0.setBindTimeout(750);
try {
client0.bind(sessionConfig0);
Assert.fail();
} catch (SmppTimeoutException e) {
// the BindTimer should end up closing the connection since the
// worker thread were "starved"
logger.debug("Correctly received SmppChannelException during bind");
}
} finally {
Thread.sleep(10500);
Assert.assertEquals(0, server0.getChannels().size());
Assert.assertEquals(3, server0.getCounters().getBindTimeouts());
server0.destroy();
}
}
/**
* Creates a new default SmppServer. Window monitoring and automatic expiration of requests will
* be disabled with no monitorExecutors. A "cachedDaemonThreadPool" will be used for IO worker
* threads.
*
* @param configuration The server configuration to create this server with
* @param serverHandler The handler implementation for handling bind requests and
* creating/destroying sessions.
*/
public DefaultSmppServer(SmppServerConfiguration configuration, SmppServerHandler serverHandler) {
this(
configuration,
serverHandler,
null,
configuration.isNonBlockingSocketsEnabled()
? new NioEventLoopGroup()
: new OioEventLoopGroup(),
configuration.isNonBlockingSocketsEnabled()
? new NioEventLoopGroup()
: new OioEventLoopGroup());
}
/**
* Creates a new default SmppServer.
*
* @param configuration The server configuration to create this server with
* @param serverHandler The handler implementation for handling bind requests and
* creating/destroying sessions.
* @param monitorExecutor The scheduled executor that all sessions will share to monitor
* themselves and expire requests. If null monitoring will be disabled.
* @param bossGroup Specify the EventLoopGroup to accept new connections and handle accepted
* connections. The {@link EventLoopGroup} is used to handle all the events and IO for {@link
* SocketChannel}.
* @param workerGroup The {@link EventLoopGroup} is used to handle all the events and IO for
* {@link Channel}.
*/
public DefaultSmppServer(
final SmppServerConfiguration configuration,
SmppServerHandler serverHandler,
ScheduledExecutorService monitorExecutor,
EventLoopGroup bossGroup,
EventLoopGroup workerGroup) {
this.configuration = configuration;
// the same group we'll put every server channel
this.channels = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);
this.serverHandler = serverHandler;
// tie the server bootstrap to this server socket channel factory
this.serverBootstrap = new ServerBootstrap();
// a factory for creating channels (connections)
if (configuration.isNonBlockingSocketsEnabled()) {
this.serverBootstrap.channel(NioServerSocketChannel.class);
} else {
this.serverBootstrap.channel(OioServerSocketChannel.class);
}
this.bossGroup = bossGroup;
this.workerGroup = workerGroup;
this.serverBootstrap.group(this.bossGroup, this.workerGroup);
// set options for the server socket that are useful
this.serverBootstrap.option(ChannelOption.SO_REUSEADDR, configuration.isReuseAddress());
// we use the same default pipeline for all new channels - no need for a factory
this.serverConnector = new SmppServerConnector(channels, this);
this.serverBootstrap.childHandler(
new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ch.pipeline()
.addLast(SmppChannelConstants.PIPELINE_SERVER_CONNECTOR_NAME, serverConnector);
}
});
// a shared timer used to make sure new channels are bound within X milliseconds
this.bindTimer = new Timer(configuration.getName() + "-BindTimer0", true);
// NOTE: this would permit us to customize the "transcoding" context for a server if needed
this.transcoder = new DefaultPduTranscoder(new DefaultPduTranscoderContext());
this.sessionIdSequence = new AtomicLong(0);
this.monitorExecutor = monitorExecutor;
this.counters = new DefaultSmppServerCounters();
if (configuration.isJmxEnabled()) {
registerMBean();
}
}
protected void destroySession(Long sessionId, DefaultSmppSession session) {
// session destroyed, now pass it upstream
counters.incrementSessionDestroyedAndGet();
decrementSessionSizeCounters(session);
serverHandler.sessionDestroyed(sessionId, session);
// unregister this session as an mbean
if (configuration.isJmxEnabled()) {
session.unregisterMBean(
configuration.getJmxDomain()
+ ":type="
+ configuration.getName()
+ "Sessions,name="
+ sessionId);
}
}
private void registerMBean() {
if (configuration == null) {
return;
}
if (configuration.isJmxEnabled()) {
// register the this queue manager as an mbean
try {
ObjectName name =
new ObjectName(configuration.getJmxDomain() + ":name=" + configuration.getName());
ManagementFactory.getPlatformMBeanServer().registerMBean(this, name);
} catch (Exception e) {
// log the error, but don't throw an exception for this datasource
logger.error("Unable to register DefaultSmppServerMXBean [{}]", configuration.getName(), e);
}
}
}
@Override
public void stop() {
if (this.channels.size() > 0) {
logger.info(
"{} currently has [{}] open child channel(s) that will be closed as part of stop()",
configuration.getName(),
this.channels.size());
}
// close all channels still open within this session "bootstrap"
this.channels.close().awaitUninterruptibly();
// clean up all external resources
if (this.serverChannel != null) {
this.serverChannel.close().awaitUninterruptibly();
this.serverChannel = null;
}
logger.info("{} stopped on SMPP port [{}]", configuration.getName(), configuration.getPort());
}
protected BaseBindResp createBindResponse(BaseBind bindRequest, int statusCode) {
BaseBindResp bindResponse = (BaseBindResp) bindRequest.createResponse();
bindResponse.setCommandStatus(statusCode);
bindResponse.setSystemId(configuration.getSystemId());
// if the server supports an SMPP server version >= 3.4 AND the bind request
// included an interface version >= 3.4, include an optional parameter with configured
// sc_interface_version TLV
if (configuration.getInterfaceVersion() >= SmppConstants.VERSION_3_4
&& bindRequest.getInterfaceVersion() >= SmppConstants.VERSION_3_4) {
Tlv scInterfaceVersion =
new Tlv(
SmppConstants.TAG_SC_INTERFACE_VERSION,
new byte[] {configuration.getInterfaceVersion()});
bindResponse.addOptionalParameter(scInterfaceVersion);
}
return bindResponse;
}
@Override
public void destroy() {
this.bindTimer.cancel();
stop();
// Shut down all event loops to terminate all threads.
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
try {
// Wait until all threads are terminated.
bossGroup.terminationFuture().sync();
workerGroup.terminationFuture().sync();
} catch (InterruptedException e) {
// is ok
}
this.serverBootstrap = null;
unregisterMBean();
logger.info("{} destroyed on SMPP port [{}]", configuration.getName(), configuration.getPort());
}
@Override
public void start() throws SmppChannelException {
if (isDestroyed()) {
throw new SmppChannelException("Unable to start: server is destroyed");
}
try {
ChannelFuture f = this.serverBootstrap.bind(new InetSocketAddress(configuration.getPort()));
// wait until the connection is made successfully
boolean timeout = !f.await(configuration.getBindTimeout());
if (timeout || !f.isSuccess())
throw new SmppChannelException(
"Can't bind to port "
+ configuration.getPort()
+ " after "
+ configuration.getBindTimeout()
+ " milliseconds");
logger.info("{} started on SMPP port [{}]", configuration.getName(), configuration.getPort());
serverChannel = f.channel();
} catch (ChannelException e) {
throw new SmppChannelException(e.getMessage(), e);
} catch (InterruptedException e) {
throw new SmppChannelException(e.getMessage(), e);
}
}
public void setConfiguration() {
this.configuration = new SmppServerConfiguration();
configuration.setPort(PORT);
configuration.setMaxConnectionSize(10);
configuration.setNonBlockingSocketsEnabled(true);
configuration.setDefaultRequestExpiryTimeout(30000);
configuration.setDefaultWindowMonitorInterval(15000);
configuration.setDefaultWindowSize(5);
configuration.setDefaultWindowWaitTimeout(configuration.getDefaultRequestExpiryTimeout());
configuration.setDefaultSessionCountersEnabled(true);
configuration.setJmxEnabled(true);
configuration.setReuseAddress(true);
}
protected void createSession(
Long sessionId,
Channel channel,
SmppSessionConfiguration config,
BaseBindResp preparedBindResponse)
throws SmppProcessingException {
// NOTE: exactly one PDU (bind request) was read from the channel, we
// now need to delegate permitting this bind request by calling a method
// further upstream. Only after the server-side is completely ready to
// start processing requests from this session, do we want to actually
// return the bind response and start reading further requests -- we'll
// initially block reading from the channel first -- this will be turned
// back on via the "serverReady()" method call on the session object
// make sure the channel is not being read/processed (until we flag we're ready later on)
channel.config().setAutoRead(false);
// auto negotiate the interface version in use based on the requested interface version
byte interfaceVersion = this.autoNegotiateInterfaceVersion(config.getInterfaceVersion());
// create a new server session associated with this server
DefaultSmppSession session =
new DefaultSmppSession(
SmppSession.Type.SERVER,
config,
channel,
this,
sessionId,
preparedBindResponse,
interfaceVersion,
monitorExecutor);
// replace name of thread used for renaming
SmppSessionThreadRenamer threadRenamer =
(SmppSessionThreadRenamer)
channel.pipeline().get(SmppChannelConstants.PIPELINE_SESSION_THREAD_RENAMER_NAME);
threadRenamer.setThreadName(config.getName());
// add a logging handler after the thread renamer
SmppSessionLogger loggingHandler =
new SmppSessionLogger(
DefaultSmppSession.class.getCanonicalName(), config.getLoggingOptions());
channel
.pipeline()
.addAfter(
SmppChannelConstants.PIPELINE_SESSION_THREAD_RENAMER_NAME,
SmppChannelConstants.PIPELINE_SESSION_LOGGER_NAME,
loggingHandler);
// decoder in pipeline is ok (keep it)
// create a new wrapper around a session to pass the pdu up the chain
channel.pipeline().remove(SmppChannelConstants.PIPELINE_SESSION_WRAPPER_NAME);
channel
.pipeline()
.addLast(
SmppChannelConstants.PIPELINE_SESSION_WRAPPER_NAME, new SmppSessionWrapper(session));
// check if the # of channels exceeds maxConnections
if (this.channels.size() > this.configuration.getMaxConnectionSize()) {
logger.warn(
"The current connection size [{}] exceeds the configured max connection size [{}]",
this.channels.size(),
this.configuration.getMaxConnectionSize());
}
// session created, now pass it upstream
counters.incrementSessionCreatedAndGet();
incrementSessionSizeCounters(session);
this.serverHandler.sessionCreated(sessionId, session, preparedBindResponse);
// register this session as an mbean
if (configuration.isJmxEnabled()) {
session.registerMBean(
configuration.getJmxDomain()
+ ":type="
+ configuration.getName()
+ "Sessions,name="
+ sessionId);
}
}
public SmppServerConfiguration createSmppServerConfiguration() {
SmppServerConfiguration configuration = new SmppServerConfiguration();
configuration.setPort(PORT);
configuration.setSystemId("cloudhopper");
return configuration;
}