Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. In the CXF documentationthey write.
To write portable code, you should treat them as non-thread safe and synchronize access or use a pool of instances or similar. For most "simple" use cases, you can use CXF proxies on multiple threads. The above outlines the workarounds for the others. Does anyone have any contrary experiences? Encountered multi-threading issues that aren't described in their faq? Or is their description accurate and they are basically safe to use?
We recently ran into similar discussion in our project. As specified in the FAQ you are referring to, except for the features that modify HTTP conduit on the fly ex: session management and failover featuresthe CXF client proxy is thread safe. So if you do not use these features then it is okay to share the client proxy between threads. You're probably referring to runtime, but I don't think configuration time is meant to be threadsafe. That method adds elements to a HashMap with no locking.
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Of course, "thread-safe" isn't necessary a rigorously defined term, so I'm at least interested in the following:. Are different instances of the same stub class accessible concurrently by different threads, with the same effective behavior as single-threaded execution?Dove soap distributors
Is a single instance of the same stub class accessible concurrently by different threads, with the same effective behavior as the same calls interleaved in some arbitrary way in single-threaded execution? You may also wish to use the terminology described here and originating here to discuss this more precisely.
I'm not sure about axis2, but at least axis1 generates non-threadsafe client stubs. I got the impression pretty much every other SOAP client was non-threadsafe as well. If I remember correctly the issue was with the XML parsing library being used in a non-threadsafe way by the client stub. Using apache commons-pooling to pool the instances and using each one from one thread at a time worked well though.
These stubs are stateless allowing reuse of the stub instances. Can you please elaborate on the problem you are facing with Axis2.
People usually recommend Xfire over Axis. I guess I'll try to answer my own question by providing some update on futher research I did. It appears that by default older versions of Axis2 stubs may have been only "thread-compatible" cannot make calls on the same stub instance concurrently from multiple threads - but calls to different instances is OK. In some cases, at least the underlying HttpClient now seems to be thread-safe, but depending on how you generated your client, the entire stub might not be:.
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Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have created the client stub for below service using apache-cxf 's wsdl2java command. I have read that cxf clients are thread safe. But I have a doubt whether it is safe to use the same WeatherSoap instance accross multiple threads? Above code is used to call the SOAP service. I had similar usecase, where I had a front end presentation layer and number of network servers, to interact between these I had a rest for presentation and SOAP which implements business logic as well as interacts with servers.
Hence I implemented a soap client in rest layer. I had requirement were I needed split rest request and invoke parallel soap calls which had time delays ms. I performance tested the entire setup and did not run-up into any thread issues. Learn more. Asked 5 years ago. Active 4 years, 2 months ago. Viewed 6k times. From the above code, I find you are creating instance of Weather for each request.
Hence there is no question of threads comes into picture. Bit more code insight might require to find if there are any thread safe issues. KarthikPrasad It is difficult to put the actual code here. Active Oldest Votes. Karthik Prasad Karthik Prasad 7, 5 5 gold badges 44 44 silver badges 81 81 bronze badges. Hi Karthik, Thanks for the answer. It seems very useful.
I highly appreciate if you could point me to any kind of reference such as a documentation or a forum discussion which related to this. Here is the documentation link cxf. Correct me if I'm wrong.SOAP Web Services 01 - Introduction To Web Services
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Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap. Technical site integration observational experiment live on Stack Overflow.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again.
If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. It provides a failover feature inspired by the Circuit Breaker design pattern and Michael T. Nygard's book "Release It".
After some defined time it can attempt to restore connection to a previously discarded node failback. Ability to failback is a main functional improvement comparing to standard failover feature being part of Apache CXF package. The webservice client is configured with one or more target endpoints in the order of preference primary node as the first.
The integration to each of remote endpoints is seen a "cicruit" which is watched by a Circuit Switcher and and when things are looking bad the remote webservice is not responding or response time exceeds configurable receiveTimeout we back off for some time and try next endpoint switch to another circuit. Each of the circuits can be in 3 states: ClosedOpen and HalfOpen.
When in Closed state, each call to the target endpoint is allowed.Yeezy slides retail price
But each time it fails, a failure counter is incremented, and when the failure counter reaches a configurable failureThresholdthe circuit moves to the Open state.
When it moves to Open state, it starts a timer set to elapse at a configurable resetTimeout value. If the timeout has not been reached, each call to the target endpoint is not allowed and next endpoint from the addressList is selected or exception is thrown if no more endpoints available.
When the resetTimeout has been reached, the circuit moves to HalfOpen state. In this state we are tentatively calling the target endpoint to check if it's healthy again. This means that the next call to the endpoint is allowed, but if it fails, the circuit immediately switches back to the Open state and the timeout period starts again. If the call to the target endpoint while in HalfOpen state succeeds, the circuit switches back to the Closed state.
Next step would be to pass it to a standard Apache CXF org. One of solutions is one I found this blog post. Basically the idea is to use Spring and wrap the client bean must be of prototype scope in a special proxy. Spring will then create an object pool based on commons-pool library and create as many bean instances as necessary to keep each bean used by only one thread.Seme male reader x prussia
The above snippet means that we tell Spring not to create more than 20 clients in the pool and if the pool is empty all the beans are currently in usewe should wait no more than ms.
Maven artifact is available in central :. The library has been production tested and has good unit and integration test coverage. Feel free to report any issues.
Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Failover feature for Apache CXF webservice client.CXF supports Java 7. Since Java 7 contains the 2. CXF 3. Users are strongly encouraged to start moving to Java 8.
Asynchronous Client HTTP Transport
JDK 1. However, it incorporates an old version of the RI. CXF does not support this version. As of 1. As of this writing, these are version 2. Yes for CXF 2.
Keep in mind though that Java 2 SE 5. CXF 2. In order to upgrade to 2. There are no more planned releases for the 2. Users are strongly encouraged to start moving to Java 7 and to start migrating to newer versions of CXF.
Several companies provide services, training, documentation, support, etc Krizsan Study Notes. Java Ranch also provides and information page in regards to the certification. Reason: One of the mysteries of java is that abstract methods and thus interface methods do NOT get their parameter names compiled into them even with debug info. Thus, when the service model is built from an interface, there is no way to determine the names that were using in the original code.
If the service is built from a concrete class instead of an interface AND the class was compiled with debug info, we can get the parameter names.Download Documentation. The starting point for developing a service consumer or client in CXF is a WSDL contract, complete with port type, binding, and service definitions. The stub code provides the supporting code that is required to invoke operations on the remote service.
For CXF clients, the wsdl2java utility can generate the following kinds of code:. In practice, the binding is normally generated automatically - for example, by running either of the CXF wsdl2soap or wsdl2xml utilities.
Enter the following command at a command-line prompt:. The -ant option generates an ant build. The -client option generates starting point code for a client main method.
This section describes how to write the code for a simple Java client, based on the WSDL contract above. To implement the client, you need to use the following stub classes:. The below shows the typical outline for a generated service class, ServiceNamewhich extends the javax. Service base class. For every port type defined in the original WSDL contract, you can generate a corresponding service endpoint interface in Java.
Each operation defined in the original WSDL port type maps to a corresponding method in the service endpoint interface. The operation's parameters are mapped as follows:. For example, the below shows the Greeter service endpoint interface, which is generated from the Greeter port type defined in Example1. Here is Java code that implements the HelloWorld client.
In summary, the client connects to the SoapPort port on the SOAPService service and then proceeds to invoke each of the operations supported by the Greeter port type. A new port object which enables you to access the remote server endpoint is created in two steps, as shown in the following code fragment:.
To create a new port object, you first create a service object passing in the WSDL location and service name and then call the appropriate get PortName method to obtain an instance of the particular port you need. In particular, contexts can be used to modify connection properties and to send data in protocol headers. For example, you could use contexts to add a SOAP header, either to a request message or to a response message.
The following types of context are supported on the client side:.
Allow ClientImpl to be thread-safe
To set a particular request context property, ContextPropertyNameto the value, PropertyValueuse the code shown here:. You have to cast the port object to javax. BindingProvider in order to access the request context.Download Documentation. Camel additionally implements a CXF transport for Camel exchanges.
The transport functionality is based on two fundamental definitions: conduit and destination. Conduits are responsible for sending a message to recipients and destinations for receiving a message from the sender. In order to send a response, a destination needs its own back-channel conduit in case of request-response communication. Conduits and destinations are created by a TransportFactory. To send a message into a physical channel, the conduit should access the message context.
Normal practice in this case would be to use a subclass of OutputStream extending CachedOutputStream. The custom stream will be fed the message and provided the possibility to access context in streaming or buffered form depending on the transport requirements. CachedOutputStream is configured to keep message in memory only up to a predefined size. If this size is exceeded, the message is swapped to disk. There are two ways to register a transport factory: programmatically or via Spring configuration.
To register transport factory programmatically it is necessary to execute the following code:. In this case important is method TransportFactory. This method returns list of protocol prefixes supported by this TransportFactory. Destinations are normally created by service on startup and released by shutdown. Conduits can be either recreated for each request or cached based on endpoint information for whole client life time.
Clients can make concurrent calls to endpoints using different protocols and bound them to different conduits.
Conduit and destination objects can by concurrently accessed by multiple threads.Gillo riser for sale
Implementations should care about thread safety of the class. CXF is completely streaming oriented — it causes high performance and scalability. What is the start point to understand the CXF transport layer and implement own transport? They are located into packages: org. Apache CXF. This page summarizes an experience and use cases of implementing a new custom CXF transport.
Use Cases Basically there are two main use cases for implementing a new CXF transport: Providing a new physical protocol not yet supported by CXF udp or ftp, for example.
Some such cases can be solved by using integration with a corresponding Camel component, but if no such component is available or workable creating a new custom CXF transport should be considered. Supporting tight integration with another framework like JBI or Camel. In this case integration would be kept transparent for CXF applications - they would just speak directly with the target framework on the transport level.
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