As we know ,many threads can use one connection at the same time, but when will lettuce create a new connection ，what‘s the trigger conditions
From the docs: it's when you call the connect method.
https://lettuce.io/core/release/api/
public static <K,V> StatefulRedisMasterSlaveConnection<K,V> connect(RedisClient
redisClient, RedisCodec<K,V> codec, Iterable<RedisURI> redisURIs)
Open a new connection to a Redis Master-Slave server/servers using the supplied
RedisURI and the supplied codec to encode/decode keys.
Related
I am working on a Spring Cloud Stream Kafka application. I have added only consumers to consume messages from topics and deliver them to a third party using FIX protocol.
It is working fine till this point, but now the third party sends back the response and I would like to produce them to a new topic. When I added a Supplier in my existing code, it starts behaving weirdly. bootstrap.servers config changes from remoteHost broker to localhost and started giving below error:
[AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established> Broker may not be available.
error would come if trying to connect localhost as there isn't any Kafka setup.
Below is my application.yml file:
spring.cloud.stream.function.definition: amerData;emeaData;ackResponse #added new ackResponse here
spring.cloud.stream.kafka.streams:
binder:
brokers: remoteHost:9092
configuration:
schema.registry.url: remoteHost:8081
default.key.serde: org.apache.kafka.common.serialization.Serdes$StringSerde
default.value.serde: io.confluent.kafka.streams.serdes.avro.SpecificAvroSerde
bindings:
ackResponse-out-0: #new addition
producer.configuration:
key.serializer: io.confluent.kafka.serializers.KafkaAvroSerializer
value.serializer: io.confluent.kafka.serializers.KafkaAvroSerializer
spring.cloud.stream.bindings:
amerData-in-0:
destination: topic1
emeaData-in-0:
destination: topic2
ackResponse-out-0: #new addition
destination: topic3
and tried possible options for Supplier -> Supplier<String> ackResponse() or Supplier<Message<String>> ackResponse()
It only doesn't change remoteHost to localhost when I am doing Supplier<KStream<String,String>> ackResponse(), then bootstrap.servers show the configured remote one, but this isn't correct and I can't write the received response (mostly a string or json) like this to a Kafka topic.
I did configure my consumers as Consumer<KStream<String, AVROPOJO1>> amerData() and Consumer<KStream<String, AVROPOJO2>> emeaData() as per need & they work fine.
Am I missing or messing up something? Can't we have producer/consumer both in the same spring cloud stream application? Using Streambridge also couldn't solve this. Could someone help?
If you are adding a Supplier bean as you have done, it becomes a regular producer that is using the MessageChannel based Kafka binder. You need to add the regular Kafka binder in your project (spring-cloud-stream-binder-kafka). The bindings for that should be under spring.cloud.stream.kafka.bindings. I see that you have it defined above under spring.cloud.stream.kafka.streams.bindings. I wonder if that is the issue?
I am working on Delphi 7, SQL Server 2008 R2 and i am using ADO to connect to database.
My Connection String:
Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=TESTDataBase;Data Source=TestDataSource
when i make my TADOconnection.Connected to True Connectin string is changing it to
Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=TESTDataBase;Data Source=TestDataSource; Use Procedure for Prepare=1;
Auto Translate=True;Packet Size=4096;Workstation ID=MYMachineName;Use Encryption for Data=False;Tag with column collation when possible=False
There are more than 10 applications and i am planning to use the same connection string in all applications.
so when i connect to FirstApplcation i am creating ADO Connection string, saving it in registry or some where so i can use the same connection string for other applications also.
Same user can run more than one application(it can be 2 or 3 or 5 applications).
Here i have 3 questions
1)when i need to share connection?
i mean create the connection string and share the same Connection string(write to registry or some where)
or
create the connection string , connect to database and share the same connection string(write to registry or some where)
2) In my application when i get the shared connection string do i need to connect to database again(TADOConnection.Connected= true)? i think i should connect it again, since it is different application :)
3) For all my applications i open connection at application(main form) form show and i will be closing connection at application(main form) form close.So connection will get close only when application closes and TADOCOnnection.KeepConnection = True. is this create performance issues or burden on database server?
A shared UDL file can be good for sharing a connection. Use the required properties only for your connection string, i.e:
Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security
Info=False;Initial Catalog=TESTDataBase;Data Source=TestDataSource
Don't worry about the extra properties that are added by the ADO after you connect. it's the default properties for the specific provider you use (SQLOLEDB.1). The same properties will be set in all your other applications if you use the exact connection string or UDL file (with a common provider).
ADO connections to SQL Server are pooled by default.
You can simply set e.g.
MyConnection.ConnectionString := 'FILE NAME=c:\my_shared_path\shared.udl';
MyConnection.Open;
A good place to hold a shared connection object (TADOConnection) is in a shared Data Module for the entire application.
Open it in the data module or the main form OnCreate event.
The connection is automatically closed once the TADOConnection is destroyed.
I'm using Rabbit MQ's Ruby client (Bunny).
I moved the hole Bunny config and initializing process in an initializer.
How can I access channels/queues opened on a Bunny connection from inside a controller or a lib?
I get 'true' when I call Bunny::Session#open? but I cannot seem to figure out how to access everything I need in that session.
Queues: If you give the queue a name, you can call .queue with the same name as much as you want, it will never create more than the one queue, but it will recreate the queue if it disappeared for any reason.
handle_to_my_queue = $rabbit_channel.queue(queue_name)
Channels: If you create the channel with an id, then you can call create_channel and it will act like a "find or create".
For channels, you typically only need one, so I use a global variable (gasp, I know!).
config/initializers/rabbit.rb
$rabbit_connection = Bunny.new
$rabbit_connection.start
$rabbit_channel = $rabbit_connection.create_channel
As Aaron Henderson said, you just need a global variable which holds the connection session.
You can specify name while creating queues, and same name can be used to
access it and the id parameter can be used to access the channel.
Initialize Bunny client with options like host, port and credentials:
$rmq_session = Bunny.new(
host: host,
port: port,
username: username,
password: password
)
$rmq_session.start
Create a channel with the bunny session.
sample_channel = $rmq_session.create_channel
The same channel can be accessed by the id parameter.
$rmq_session.channel(sample_channel.id)
Channels are identified by their ids which are integers. Bunny takes care of allocating and releasing them as channels are opened and closed. It is almost never necessary to specify channel ids explicitly. There is a limit on the maximum number of channels per connection, usually 65536. Note that allocating channels is very cheap on both client and server so having tens, hundreds or even thousands of channels is not a problem Read more about channel here.
Create a queue with the bunny session.
sample_queue = sample_channel.queue('sample.queue')
You can access the above created queue by referring the queue name. This will not create new queue if already one exists.
sample_queue = sample_channel.queue('sample.queue')
We have an app that invokes various remote methods on MBeans using MBeanServerConnection.invoke.
Occasionally one of these methods hangs.
Is there any way to have a timeout on the call? so that it will return with an exception if the call takes too long?
Or do I have to move all those calls into separate threads so they don't lock up the UI and require killing the app?
See http://weblogs.java.net/blog/emcmanus/archive/2007/05/making_a_jmx_co.html
===== Update =====
I was thinking about this stuff when I first responded, but I was on my mobile and I can't type worth a damn on it.....
This is really an RMI problem, and unless you use a different protocol, there's not much you can do, except, as you say, move all those calls into separate threads so they don't lock up the UI.
But.... if you have the option of fiddling with the target server and you can customize the connecting client, you have at least 1 option which is to customize the JMXConnectorServer on your target servers.
The standard JMXConnectorServer implementation is the RMIConnectorServer. Part of it's specification is that when you create a new instance using any of the constructors (like RMIConnectorServer(JMXServiceURL url, Map environment)), the environment map can contain a key/value pair where the key is RMIConnectorServer.RMI_CLIENT_SOCKET_FACTORY_ATTRIBUTE and the value is a RMIClientSocketFactory. Therefore, you can specify a socket factory method like this:
RMIClientSocketFactory clientSocketFatory = new RMIClientSocketFactory() {
public Socket createSocket(String host, int port) {
Socket s = new Socket(host, port);
s.setSoTimeout(3000);
}
};
This factory creates a Socket and then sets its SO_TIMEOUT using setSoTimeout, so when the client connects using this socket, all operations, including connecting, will timeout after 3000 ms.
You could also checkout the JMXMP connector and server in the jmx-optional package of the OpenDMK. (links are to my github mavenized). No built in solution, mind you, but they're super easy to extend and JMXMP is simple TCP socket based rather than RMI, so this type of customization would be trivial.
Cheers.
# Nicholas : The above code is not working.I mean request is not getting timeout after 3000. ms.
map.put(RMIConnectorServer.RMI_CLIENT_SOCKET_FACTORY_ATTRIBUTE , new RMIClientSocketFactory() {
#Override
public Socket createSocket(String host, int port) throws IOException {
if(logger.isInfoEnabled() ){
logger.info("JMXManager inside createSocket..." + host + ": port :" + port);
}
Socket s = new Socket(host, port);
s.setSoTimeout(3000);
return s;
}
});
cs = JMXConnectorServerFactory.newJMXConnectorServer(url,map,mbeanServer);
As I answered on: How to set request timeout for JMX Connector the RMI properties can help you. All the properties are on Oracle documentation site:
http://docs.oracle.com/javase/7/docs/technotes/guides/rmi/sunrmiproperties.html.
For example: -Dsun.rmi.transport.tcp.responseTimeout=60000 is a client side tcp response timeout. There are also properties for connect timeout and for server side connections.
I also am not happy how the JMX/RMI/TCP stack hides important settings from lower level protocols, and makes it not available for a single connection.
My JMS client connects to WMQ through JNDI. The initial context factory used is com.ibm.mq.jms.context.WMQInitialContextFactory.
Currently, at WMQ side, there's a queue manager called TestMgr. Under this queue manager I created two channels. One is PLAIN.CHL which does not specify an SSL Cipher Spec, the other one is SSL.CHL which configured SSL Cipher Spec with RC4_MD5_US and SSL Authentication with Optional.
I have created a key store for the queue manager using IBM Key Management tool. The path of key db is [wmq_home]\qmgrs\TestMgr\ssl\key.
For channel PLAIN.CHL, I defined a queue connection factory like:
DEF QCF(PlainQCF) QMANAGER(TestMgr) CHANNEL(PLAIN.CHL) HOST(192.168.66.23) PORT(1414) TRANSPORT(client)
And under the SSL channel SSL.CHL, I defined a queue connection factory like:
DEF QCF(SSLQCF) QMANAGER(TestMgr) CHANNEL(SSL.CHL) HOST(192.168.66.23) PORT(1414) TRANSPORT(client) SSLCIPHERSUITE(SSL_RSA_WITH_RC4_128_MD5)
Now I only can create connection using the PlainQCF. But failed to look up the SSL queue connection factory. My code looks like:
Hashtable environment = new Hashtable();
environment.put(Context.INITIAL_CONTEXT_FACTORY, "com.ibm.mq.jms.context.WMQInitialContextFactory");
environment.put(Context.PROVIDER_URL, "192.168.66.23:1414/SSL.CHL");
Context ctx = new InitialContext( environment );
QueueConnectionFactory qcf = (QueueConnectionFactory) ctx.lookup("SSLQCF");
qcf.createConnection();
....
Am I missing some context properties when looking up the SSL factory? connection And then I found the code is hanging on the line new InitialContext( environment ) for a long time, almost 5 minutes, and I got CC=2;RC=2009;AMQ9208... error.
Any suggestion would be appreciated. Is it true that SSL channel can't be connected by JNDI?
#T.Rob, thanks for your reply very much. But we still want to use WMQInitialContextFactory, so I'm afraid I still need to find solution for this.
I just defined the connection factory one time. The displayed info for the SSL queue connection factory like:
InitCtx> DISPLAY QCF(SSLQCF)
ASYNCEXCEPTION(ALL)
CCSID(819)
CHANNEL(SSL.CHL)
CLIENTRECONNECTOPTIONS(ASDEF)
CLIENTRECONNECTTIMEOUT(1800)
COMPHDR(NONE )
COMPMSG(NONE )
CONNECTIONNAMELIST(192.168.66.23(1414))
CONNOPT(STANDARD)
FAILIFQUIESCE(YES)
HOSTNAME(192.168.66.23)
LOCALADDRESS()
MAPNAMESTYLE(STANDARD)
MSGBATCHSZ(10)
MSGRETENTION(YES)
POLLINGINT(5000)
PORT(1414)
PROVIDERVERSION(UNSPECIFIED)
QMANAGER(TestMgr)
RESCANINT(5000)
SENDCHECKCOUNT(0)
SHARECONVALLOWED(YES)
SSLCIPHERSUITE(SSL_RSA_WITH_RC4_128_MD5)
SSLFIPSREQUIRED(NO)
SSLRESETCOUNT(0)
SYNCPOINTALLGETS(NO)
TARGCLIENTMATCHING(YES)
TEMPMODEL(SYSTEM.DEFAULT.MODEL.QUEUE)
TEMPQPREFIX()
TRANSPORT(CLIENT)
USECONNPOOLING(YES)
VERSION(7)
WILDCARDFORMAT(TOPIC_ONLY)
The JNDI Provider should be fine because I can look up the plain connection factory successfully. Also, for my client app, I extracted the cert from the key store which created for MQ server and imported it to the trust store(cacerts) of my JRE with alias name ibmwebspheremqtestmgr.
You are correct, with 2009 error there are some log entries:
=================================================================
4/20/2012 20:24:27 - Process(13768.3) User(MUSR_MQADMIN) Program(amqzmur0.exe)
Host(xxxx_host of my MQ) Installation(mqenv)
VRMF(7.1.0.0) QMgr(TestMgr)
AMQ6287: WebSphere MQ V7.1.0.0 (p000-L111019).
EXPLANATION:
WebSphere MQ system information:
Host Info :- Windows Server 2003, Build 3790: SP2 (MQ Windows 32-bit)
Installation :- C:\IBM\WebSphereMQ (mqenv)
Version :- 7.1.0.0 (p000-L111019)
ACTION:
None.
-------------------------------------------------------------------------------
4/20/2012 20:24:27 - Process(7348.116) User(MUSR_MQADMIN) Program(amqrmppa.exe)
Host(xxxx_host of my MQ) Installation(mqenv)
VRMF(7.1.0.0) QMgr(TestMgr)
AMQ9639: Remote channel 'SSL.CHL' did not specify a CipherSpec.
EXPLANATION:
Remote channel 'SSL.CHL' did not specify a CipherSpec when the local channel
expected one to be specified.
The remote host is 'xxx_host of my app (192.168.66.25)'.
The channel did not start.
ACTION:
Change the remote channel 'SSL.CHL' on host 'xxx_host of my app (192.168.66.25)' to
specify a CipherSpec so that both ends of the channel have matching
CipherSpecs.
----- amqcccxa.c : 3817 -------------------------------------------------------
4/20/2012 20:24:27 - Process(7348.116) User(MUSR_MQADMIN) Program(amqrmppa.exe)
Host(my app host) Installation(mqenv)
VRMF(7.1.0.0) QMgr(TestMgr)
AMQ9999: Channel 'SSL.CHL' to host 'xxx_host of my app (192.168.66.25)' ended
abnormally.
====================================================================
I also got some confusion with the error log. My app staged at at a machine which is different from my MQ. But the log says the Change the remote channel 'SSL.CHL' on host 'xxx_host of my app (192.168.66.25)' to
specify a CipherSpec so that both ends of the channel have matching
CipherSpecs. How can I change the channel cipher spec on my app host?
updates on MQEnvironment...
reply the comments.
The value of MQEnvironment.sslCipherSuite is null, so it throws out NullPointerExcetpion when i put it the the env hashtable. But i tried another one environment.put(MQC.SSL_CIPHER_SUITE_PROPERTY, "SSL_RSA_WITH_RC4_128_MD5") and it still failed with 2009 error.
For JMSAdmin tool, i had changed the config to use WMQInitialContextFactory. The configuration like(JMSAdmin.config):
INITIAL_CONTEXT_FACTORY=com.ibm.mq.jms.context.WMQInitialContextFactory
PROVIDER_URL=192.168.66.23:1414/SYSTEM.DEF.SVRCONN
The rest configuration leaves as default.
Kindly note, here i use the default channel SYSTEM.DEF.SVRCONN so that i can logon to admin console. If I change the channel to the SSL oneSSL.CHL, I also can't logon to admin console. The error happened here is just like the one in my client app.
Another clarification, in my client, i use follow code can connect to connect qmgr(TestMgr) successfully through channel SSL.CHL.
MQConnectionFactory factory = new MQConnectionFactory();
factory.setTransportType(JMSC.MQJMS_TP_CLIENT_MQ_TCPIP);
factory.setQueueManager("TestMgr");
factory.setSSLCipherSuite("SSL_RSA_WITH_RC4_128_MD5");
factory.setPort(1414);
factory.setHostName("192.168.66.23");
factory.setChannel("SSL.CHL");
MQConnection connection = (MQConnection) factory.createConnection();
And now the problem is just like you said, that's the initial context failed connect to qmgr through SSL channel. The option(use plain channel for initial context and ssl channel for connection factory) you provided works too. But I still want to know how to get initial context with ssl channel work. Thanks for you patience very much. Your updates will be appreciated.
thanks
I never really liked com.ibm.mq.jms.context.WMQInitialContextFactory very much. It stores the managed objects on a queue. So in order to lookup the connectionFactory, which tells JMS how to connect to the QMgr, it is first necessary to connect to the QMgr to make the JNDI call. Therefore, before you can debug the SSL connection, you need to know whether the underlying JNDI provider is working.
If you want to skip the MQ-based JNDI provider and just use the filesystem, see the updated version of Bobby Woolf's article here. If you want to continue with com.ibm.mq.jms.context.WMQInitialContextFactory, read on but be prepared to provide more configuration info.
When you run the JMSAdmin tool, do you display the objects after creating them? For example, here is one of my JMSAdmin.bat scripts:
# Connection Factory for Client mode
# Delete the Connection Factory if it exists
DELETE CF(JMSDEMOCF)
# Define the Connection Factory
DEFINE CF(JMSDEMOCF) +
SYNCPOINTALLGETS(YES) +
SSLCIPHERSUITE(NULL_SHA) +
TRAN(client) +
HOST(127.0.0.1) CHAN(SSL.SVRCONN) PORT(1414) +
QMGR( )
# Display the resulting definition
DISPLAY CF(JMSDEMOCF)
This deletes the object (because JMSAdmin doesn't have a define with replace option) then defines the object, then displays it. Do you in fact see both objects defined? Can you connect and interactively display them both? Can you update your question with the contents displayed?
If so, then what does the JNDI provider configuration look like with each sample program? The 2009 indicates that there is at least a connection to the QMgr being made, so it is important to determine whether the thing that suffering the broken connection is your app or the JNDI provider. To diagnose that requires the config info you are using for the JNDI provider and whether it is the same in the working and failing cases. If not, how do they differ?
Once you know whether it's the app or the JNDI provider that is causing the problem (or switch to another JNDI provider that doesn't require an MQ connection such as the filesystem initial context) then it will be possible to determine the next steps.
The article linked above has samples of code and managed object scripts that use a filesystem JNDI provider. You may notice my scripts pasted in above use the same QMgr name. That's because I wrote that part of the article. When I want to switch to SSL using those same samples, I just update the connectionFactory to point to the SSL channel and it works.
Here are the other bits from the sample that I've modified:
java -Djavax.net.debug=ssl ^
-Djavax.net.ssl.trustStore=key2.jks ^
-Djavax.net.ssl.keyStore=key2.jks ^
-Djavax.net.ssl.keyStorePassword=???????? ^
-Djavax.net.ssl.trustStorePassword=???????? ^
-cp "%CLASSPATH%" ^
com.ibm.examples.JMSDemo -pub -topic JMSDEMOPubTopic %*
Note: The ^ is Windows version of line continuation.
Then if there are problems, I follow the debugging scenario I described in this SO answer. Note that the app will require a truststore, even if you have SSLCAUTH(OPTIONAL) on your channel. This is because the app must always validate the QMgr's certificate, even if the app does not present its own certificate. In my case I was using SSLCAUTH(REQUIRED) so my app needed both a keystore and a truststore. Your question mentions that the QMgr has a keystore but does not say what you did for the application.
Finally, a 2009 will usually generate an entry in the QMgr error logs. If you continue to get the problem, please update your question with those log entries.
UPDATE:
Responding to the comments, the JMSAdmin tool is part of the WMQ package. However, WMQ it comes with jars for filesystem context and LDAP context. The WMQInitialContextFactory is optional and is delivered as SupportPac ME01. When using WMQInitialContextFactory with the JMSAdmin tool (or the JMSAdmin GUI or with WMQ Explorer) it is necessary to configure the PROVIDER_URL with the host, port and channel. For example:
PROVIDER_URL: <Hostname>:<port>/<SVRCONN Channel Name>
192.168.66.23:1414/SSL.SVRCONN
So after reviewing your post again, I realized that you did provide the config info for WMQInitialContextFactory. I was looking for a JMSADmin.config file but you have it in the environment hash table. And that is where the problem is. You are attempting to use the SSL channel for both the WMQInitialContextFactory and the connection factory. This is what is causing the lookup to fail. The WMQInitialContextFactory first makes a Java connection to the QMgre in order to look in the queue to obtain the administered objects such as QCF. In order to do that, it needs to know the ciphersuite that the channel is set up for in order to negotiate the handshake. Right now, the *only * place that ciphersuite is recorded is in the QCF definition.
Try adding the following line:
environment.put(MQEnvironment.sslCipherSuite, "SSL_RSA_WITH_RC4_128_MD5");
As per this Infocenter page, that should tell the context factory classes what ciphersuite to use. Of course, they also need to know where the trust store is (and possibly keystore if the channel has SSLCAUTH(RQUIRED) set) so you still need to get those values in the environment. You can use the command-line variables or try loading them into the environment using code. You'll need both -Djavax.net.ssl.trustStore=key2.jks and -Djavax.net.ssl.trustStorePassword=????????.
The other option is to continue to use the plaintext channel for the WMQInitialContextFactory and the SSL channel for the application. If the plaintext channel has an MCAUSER for a non-privileged user ID, it can be restricted to only connect to the QMgr and access the queue that contains the administered objects. With those restrictions, anyone will be able to read the administered objects using that channel but not the application queues or administrative queues.