/**
* Keeps processing the {@link PendingRequest}s in the pending {@link Queue} until a QUIT is
* encountered in the pending queue. Thread will stop after processing the QUIT response (which
* is expected to be a {@link VirtualResponse}.
*
* <p>TODO: not entirely clear what is the best way to handle exceptions.
*
* <p>TODO: socket Reconnect in the context of pipelining is non-trivial, and maybe not even
* practically possible. (e.g. request n is sent but pipe breaks on some m (m!=n) response. non
* trivial.
*/
public void run() {
Log.log("AsyncConnection processor thread <%s> started.", Thread.currentThread().getName());
/** Response handler thread specific protocol handler -- optimize fencing */
Protocol protocol =
Assert.notNull(
newProtocolHandler(), "the delegate protocol handler", ClientRuntimeException.class);
PendingRequest pending = null;
while (true) {
try {
pending = pendingQueue.take();
try {
Request request =
Assert.notNull(
protocol.createRequest(pending.cmd, pending.args),
"request object from handler",
ProviderException.class);
request.write(getOutputStream());
pending.response = protocol.createResponse(pending.cmd);
pending.response.read(getInputStream());
pending.completion.signal();
if (pending.response.getStatus().isError()) {
Log.error(
"(Asynch) Error response for "
+ pending.cmd.code
+ " => "
+ pending.response.getStatus().message());
}
} catch (ProviderException bug) {
Log.error("ProviderException: " + bug.getLocalizedMessage());
bug.printStackTrace();
pending.setCRE(bug);
} catch (ClientRuntimeException cre) {
Log.error("ClientRuntimeException: " + cre.getLocalizedMessage());
cre.printStackTrace();
pending.setCRE(cre);
} catch (RuntimeException e) {
Log.error("Unexpected RuntimeException ", e);
e.printStackTrace();
pending.setCRE(
new ProviderException("Unexpected runtime exception in response handler"));
pending.setResponse(null);
break;
}
// redis (1.00) simply shutsdown connection even if pending responses
// are expected, so quit is NOT sent. we simply close connection on this
// end.
if (pending.cmd == Command.QUIT) {
AsyncConnection.this.disconnect();
break;
}
} catch (InterruptedException e1) {
e1.printStackTrace();
}
}
Log.log("AsyncConnection processor thread <%s> stopped.", Thread.currentThread().getName());
}
/**
* Creates a {@link Connection} with {@link Connection.Modality#Synchronous} semantics suitable
* for use by synchronous (blocking) JRedis clients.
*
* <p>[TODO: this method should be using connection spec!]
*
* @param host
* @param port
* @param redisVersion
* @return
*/
protected Connection createSynchConnection(String host, int port, RedisVersion redisVersion) {
InetAddress address = null;
Connection synchConnection = null;
try {
address = InetAddress.getByName(host);
synchConnection = new SynchConnection(address, port, redisVersion);
Assert.notNull(synchConnection, "connection delegate", ClientRuntimeException.class);
} catch (NotSupportedException e) {
Log.log("Can not support redis protocol '%s'", redisVersion);
throw e;
} catch (ProviderException e) {
Log.bug("Couldn't create the handler delegate. => " + e.getLocalizedMessage());
throw e;
} catch (ClientRuntimeException e) {
String msg = e.getMessage() + "\nMake sure your server is running.";
Log.error("Error creating connection -> " + e.getLocalizedMessage());
setConnection(new FaultedConnection(msg));
} catch (UnknownHostException e) {
String msg = "Couldn't obtain InetAddress for " + host;
Log.problem(msg + " => " + e.getLocalizedMessage());
throw new ClientRuntimeException(msg, e);
}
return synchConnection;
}
public SynchConnection(
InetAddress address,
int port,
// ProtocolHandler protocolHandler,
RedisVersion redisversion)
throws ClientRuntimeException, ProviderException {
super(address, port);
// protocolHandler = ProtocolManager.getFactory().createProtocolHandler
// (Connection.Modality.Synchronous, redisversion.id);
protocolHandler = new SynchProtocol();
Assert.notNull(
protocolHandler, "handlerDelegate from ProtocolManager", ProviderException.class);
this.protocolHandler =
Assert.notNull(
protocolHandler, "the delegate protocol handler", ClientRuntimeException.class);
Assert.isTrue(
protocolHandler.isCompatibleWithVersion(redisversion.id),
"handler delegate supports redis version " + redisversion,
ClientRuntimeException.class);
}
public Response serviceRequest(Command cmd, byte[]... args) throws RedisException {
/*
if(start ==-1) start = System.currentTimeMillis();
*/
if (!isConnected()) throw new NotConnectedException("Not connected!");
Request request = null;
Response response = null;
ResponseStatus status = null;
try {
// 1 - Request
//
try {
request =
Assert.notNull(
protocolHandler.createRequest(cmd, args),
"request object from handler",
ProviderException.class);
request.write(super.getOutputStream());
} catch (ProviderException bug) {
throw bug;
} catch (ClientRuntimeException problem) {
Throwable rootProblem = problem.getCause();
if (null != rootProblem && rootProblem instanceof SocketException) {
Log.log(
"[TODO -- attempt reconnect] serviceRequest() -- "
+ "unrecovered %s in Request phase <Cmd: %s>",
rootProblem, cmd.code);
}
throw problem; // TODO: reconnect here ...
} catch (RuntimeException everythingelse) {
String msg =
"For <Cmd: "
+ cmd.code
+ "> Possible bug in provider code: "
+ everythingelse.getClass().getSimpleName()
+ " => "
+ everythingelse.getLocalizedMessage();
Log.error("serviceRequest() -- Request phase -- " + msg);
throw new ProviderException(msg, everythingelse);
}
// 2 - Response
//
try {
response =
Assert.notNull(
protocolHandler.createResponse(cmd),
"response object from handler",
ProviderException.class);
response.read(super.getInputStream());
} catch (ProviderException bug) {
throw bug;
} catch (ClientRuntimeException problem) {
Throwable rootProblem = problem.getCause();
if (null != rootProblem) {
if (rootProblem instanceof SocketException) {
Log.log(
"[NET] [TODO (attempt reconnect?)] serviceRequest(%s) -- "
+ "problem in Response phase <rootProblem: %s>",
cmd.code, rootProblem);
} else if (rootProblem instanceof IOException) {
Log.log(
"[IO] [TODO (attempt reconnect?)] serviceRequest(%s) -- "
+ "problem in Response phase <rootProblem: %s>",
cmd.code, rootProblem);
}
}
throw problem; // this is caught below under ClientR..
}
// 3 - Status
//
// sending response didn't cause any problems
// check for redis errors
//
status =
Assert.notNull(
response.getStatus(), "status from response object", ProviderException.class);
if (status.isError()) {
// Log.error ("Request resulted in error: cmd: " + cmd.code + " " + status.message());
Log.error(cmd.code + " => " + status.message());
throw new RedisException(cmd, status.message());
} else if (status.code() == ResponseStatus.Code.CIAO) {
// Log.log ("serviceRequest() -- Response status is CIAO.");
// Log.log ("serviceRequest() -- closing connection ...");
disconnect();
}
} catch (ProviderException bug) {
Log.bug("serviceRequest() -- ProviderException: " + bug.getLocalizedMessage());
Log.log("serviceRequest() -- closing connection ...");
// now we must close the connection if we can
disconnect();
throw bug;
} catch (ClientRuntimeException problem) {
Log.problem(
"serviceRequest() -- Unrecovered ClientRuntimeException: "
+ problem.getLocalizedMessage());
Log.log("serviceRequest() -- closing connection ...");
// now we must close the connection if we can
disconnect();
throw problem;
} catch (RuntimeException surprise) {
surprise.printStackTrace();
// TODO: Log.log it ...
Log.bug(
"serviceRequest() -- *unexpected* RuntimeException: " + surprise.getLocalizedMessage());
Log.log("serviceRequest() -- closing connection ...");
// now we must close the connection if we can
disconnect();
throw new ClientRuntimeException(
"unexpected runtime exeption: " + surprise.getLocalizedMessage(), surprise);
} catch (Error disaster) {
disaster.printStackTrace();
// TODO: Log.log it ...
Log.bug(
"serviceRequest() -- *unforseen* Java System Error: " + disaster.getLocalizedMessage());
Log.log("serviceRequest() -- closing connection ...");
// now we must close the connection if we can
disconnect();
throw new ClientRuntimeException(
"unexpected system error: " + disaster.getLocalizedMessage(), disaster);
} finally {
}
/* - temp benchmarking request service throughput
serviceCount ++;
if(serviceCount > gate) {
delta = System.currentTimeMillis() - start;
start = System.currentTimeMillis();
throughput = (serviceCount * 1000) / (float) delta;
System.out.format ("<%s> - %8.2f /sec | serviced %d requests at %d msecs\n", Thread.currentThread().getName(), throughput, serviceCount, delta );
serviceCount = 0;
}
*/
return response;
}
