Adding State
Contents
Adding State
The service we defined in the first part of this tutorial was stateless: its responses to client requests depended solely on the requests. This is all well, but in practice services may need to maintain some form of state that pre-exists, persists, and - most importantly - changes as a result of client invocations. Many gCube services are indeed stateful.
In this second part of the tutorial we will learn how to add state to our SampleService
. In the spirit of a dumb service, the idea is to keep track of the number of visits of any client that has previously 'logged on' with the service.
The identity of logged clients and the number of their subsequent visits will then form the state of our augmented SampleService
. In particular, we will add two new port-types:
- a
Factory
port-type that allows clients to log on and thus creates state within the service . In particular, we plan a single operationlogon()
for this port-type. - a
Stateful
port-type that allows clients to visit the service and thus consults and updates the state of the the service. In particular, we plan a single operationaboutSF()
for this port-type.
(It will be soon clear why we prefer two port-types with a single operation each rather than a single port-type with two operations.)
For both port-types, we need to repeat the steps already shown for the Stateless
port-type: add the port-types descriptions to the service profile, define the WSDL interface of each port-type, and provide the Java implementation of the two port-types. Additional steps will then be required for state management.
WS-Resources and The Implied Resource Pattern
The overall state of our SampleService
will be comprised of many 'pieces', one per client that logs on and then visits. We refer to these pieces somewhat more technically as stateful resources.
How should we go about creating and accessing stateful resources?
One approach could be as follows:
- take some credentials from clients when they log on with the
Factory
port-type. A simple name would surely do for our purposes. - create stateful resources that contain the count of client visits and identify such resources with the name of the associated client.
- when a client comes back to visit the service, ask it to provide his name so that we can identify the corresponding stateful resource and update the count of its visits.
In this approach, clients need to explicitly identify the state they wish to target. Unfortunately, identifiers service-specific; here we need a name, elsewhere we will need something else. The use of identifiers is also specific: here we hinted at one parameter in the visit()
operation, elsewhere could be two or three parameters in one or more operations. This variability makes it impossible to build generic clients that can transparently access state across of different services.
You may find this observation rather strange: what could a client do that does not require knowledge of the specific service it is talking to? It turns out that, if we can build sufficient conventions on how stateful resources are represented, we can define generic clients capable of querying and changing the stateful resources of any service that complies with the conventions; we can also define generic clients that can uniformly destroy stateful resources, either immediately or based or some renewable expiry time; we can even define generic clients that allow others to subscribe for changes to the stateful resources. These are all key features in gCube, and we shall be directly concerned with some of them in this very Primer. All we need to enable such clients is;
- a uniform pattern to access stateful resources which does not change from service to service.
- a standard that codifies this access pattern and builds other conventions on top of it.
Now, the Web Services Resource Framework (WSRF) is precisely one such standard, and gCube adopts it. To access stateful resources, WSRF says: forget passing identifiers explicitly in operations such as visit()
, which vary from port-type to port-type and from service to service; let us pass them instead implicitly, as part of the address of the port-type that exposes those operations. An invocation of visit()
would thus be addressed to the Stateful
port-type, but the address would include also the identifier of the stateful resource that is the target of the request, with no need to parameterise visit()
with it. This is the access pattern that WSRF calls, for obvious reasons, the implied resource pattern.
If you think about it, this annotated address - or more appropriately, this qualified endpoint reference - identifies a pair (port-type,stateful resource). WSRF calls this pair a WS-Resource and speaks of a qualified endpoint reference to the port-type as the endpoint reference of a WS-Resource. Invoking the operations of the port-type can now be though of invoking operations of the WS-Resource. The port-type itself can be thought of as the uniform interface of potentially many WS-Resources.
With the implied resource pattern and the corresponding terminology, we can now think of our new port-types as follows:
- a
Factory
port-type that allows users to create WS-Resources. In particular, we plan a single operation for this port-type,logon()
, which takes the name of the client and returns the endpoint reference of a WS-Resource 'dedicated' to the client. - a
Stateful
port-type that allows the users to consume WS-Resources. In particular, we plan a single operation for this port-type,visit()
which takes nothing and returns nothing but is invoked with the endpoint reference of a WS-Resource.
A client will then invoke logon()
on the Factory
port-type and use the resulting WS-Resource endpoint reference to invoke vist()
against it. A couple of things to notice:
The client does not need to know about the stateful resource identifier embedded in the endpoint reference returned by the Factory
port-type. The endpoint reference identifies a WS-Resource, the inner structure of this WS-Resource as a pair (port-type,stateful resource) remains opaque.
Placing logon()
and visti()
in different port-types makes even more sense retrospectively; the first creates WS-Resources while the second defines their operations. Informally, we say that Factory
is, like Stateless
, a 'stateless port-type': it does not serve as the interface of WS-Resources. In contrast, we say that Stateful
is a 'stateful port-type', for it is meant to be used as the interface of WS-Resources.
Extending the Profile
We now enrich the service profile to reflect the existence of two new port-types.
<Resource xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <ID></ID> <Type>Service</Type> <Profile> <Description>A very simple gCube Service</Description> <Class>Samples</Class> <Name>SampleService</Name> <Packages> <Main> <Description>Describes port-types</Description> <Name>Main</Name> <Dependencies> <Dependency> <Service> <Class>Samples</Class> <Name>SampleService</Name> </Service> <Package>Stubs</Package> <Version>1.0</Version> <Scope level="GHN"/> <Optional>false</Optional> </Dependency> </Dependencies> <GARArchive>org.acme.sample.gar</GARArchive> <PortType> <Name>acme/sample/stateless</Name> <WSDL/> </PortType> <PortType> <Name>acme/sample/stateful</Name> <WSDL/> </PortType> <PortType> <Name>acme/sample/factory</Name> <WSDL/> </PortType> </Main> <Software> <Description>Describes port-type stubs</Description> <Name>Stubs</Name> <Files><File>org.acme.sample.stubs.jar</File></Files> </Software> </Packages> </Profile> </Resource>
Not much to comment about here, we just added two new PortType
elements in the description of the Main
package.
Defining the port-type interfaces
WSDL interface for the factory service
Define a new WSDL interface for the Factory service:
<definitions name="Factory" targetNamespace="http://acme.org/sample" xmlns:tns="http://acme.org/sample" xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:corefaults="http://gcube-system.org/namespaces/common/core/faults" xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/03/addressing" > <import namespace="http://gcube-system.org/namespaces/common/core/faults" location="../gcube/common/core/faults/GCUBEFaults.wsdl"/> <types> <xsd:schema targetNamespace="http://acme.org/sample"> <xsd:import namespace="http://schemas.xmlsoap.org/ws/2004/03/addressing" schemaLocation="../ws/addressing/WS-Addressing.xsd" /> <xsd:element name="logon" type="xsd:string" /> <xsd:element name="logonResponse" type="wsa:EndpointReferenceType"/> </xsd:schema> </types> <message name="logonInputMessage"> <part name="request" element="tns:logon"/> </message> <message name="logonOutputMessage"> <part name="response" element="tns:logonResponse"/> </message> <portType name="FactoryPortType"> <operation name="logon"> <input message="tns:logonInputMessage"/> <output message="tns:logonOutputMessage"/> <fault name="fault" message="corefaults:GCUBEFaultMessage"></fault> <fault name="fault" message="corefaults:GCUBEUnrecoverableFaultMessage"></fault> </operation> </portType> </definitions>
Notes:
- the interface imports the WS-Addressing.xsd to make use of the WS-Adressing types' definitions
- the interface exposes one single operation allowing to create a new stateful resource, the logon operation
- the operation takes a string as input parameter
- the operation returns an EndpointReferenceType that points to the stateful resource
Save the file as Factory.wsdl in the schema folder under the service location:
|-SampleService |--etc |---profile.xml |---deploy-jndi-config.xml |---deploy-server.wsdd |---build.properties | |--src |---org |----acme |-----sample |------ServiceContext.java |------stateless |-------Stateless.java |------tests |-------StatelessTest.java | |--schema |---Stateless.wsdl |---Factory.wsdl | | |--build.xml | |-Dependencies |--SampleService
WSDL interface for the service instance
Define a new WSDL interface for the service instance:
<definitions name="Stateful" targetNamespace="http://acme.org/sample" xmlns:tns="http://acme.org/sample" xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:coretypes="http://gcube-system.org/namespaces/common/core/types" xmlns:corefaults="http://gcube-system.org/namespaces/common/core/faults"> <import namespace="http://gcube-system.org/namespaces/common/core/faults" location="../gcube/common/core/faults/GCUBEFaults.wsdl"/> <types> <xsd:schema targetNamespace="http://acme.org/sample"> <xsd:import namespace="http://gcube-system.org/namespaces/common/core/types" schemaLocation="../gcube/common/core/types/GCUBETypes.xsd"/> <xsd:element name="aboutSF" type="coretypes:VOID" /> <xsd:element name="aboutSFResponse" type="xsd:string" /> </xsd:schema> </types> <message name="aboutSFInputMessage"> <part name="request" element="tns:aboutSF"/> </message> <message name="aboutSFOutputMessage"> <part name="response" element="tns:aboutSFResponse"/> </message> <portType name="StatefulPortType"> <operation name="aboutSF"> <input message="tns:aboutSFInputMessage"/> <output message="tns:aboutSFOutputMessage"/> <fault name="fault" message="corefaults:GCUBEFaultMessage"></fault> </operation> </portType> </definitions>
Notes:
- the port-type exposes a single operation, the aboutSF operation
- the operation does not take any input, in these cases it must be passed an element coretypes:VOID to avoid SOAP issues
- the operation returns a string
Save the interface in a file Stateful.wsdl in the schema folder under the service location:
|-SampleService |--etc |---profile.xml |---deploy-jndi-config.xml |---deploy-server.wsdd |---build.properties | |--src |---org |----acme |-----sample |------ServiceContext.java |------stateless |-------Stateless.java |------tests |-------StatelessTest.java | |--schema |---Stateless.wsdl |---Factory.wsdl |---Stateful.wsdl | | |--build.xml | |-Dependencies |--SampleService
Delving into the implementation
The implementation of the stateful part of the SampleService is a bit more complex than the stateless implementation and requires to code:
- the stateful context,
- the stateful resource,
- the resource home,
- and the two new port-types.
All the new classes implemented in this part will be placed in the new org.acme.sample.stateful
package.
Important note: since we are leaving the stateless port-type as part of our example, we do not need to extend again the GCUBEStartupPortType (in charge of the initialisation of the GCUBEServiceContext) in one of the two new port-types. Instead, if we would start from scratch a complete stateful service, it is mandatory that one port-type extends the GCUBEStartupPortType (ideally, the Factory port-type, but it's up to developer.
The Stateful Context
We begin by implementing the Stateful Context. This context models the configuration of the acme/sample/stateful port-type. It transparently adds a lot of facilities to access the statefulness of the port-type.
package org.acme.sample.stateful; import org.acme.sample.ServiceContext; import org.gcube.common.core.contexts.GCUBEServiceContext; import org.gcube.common.core.contexts.GCUBEStatefulPortTypeContext; public class StatefulContext extends GCUBEStatefulPortTypeContext { public static String FREQUENT_USER_LIMIT_JNDI_NAME = "frequentUserLimit"; private static GCUBEStatefulPortTypeContext cache = new StatefulContext(); @Override public String getJNDIName() {return "acme/sample/stateful";} @Override public String getNamespace() {return "http://acme.org/sample";} @Override public GCUBEServiceContext getServiceContext() { return ServiceContext.getContext(); } public static GCUBEStatefulPortTypeContext getPortTypeContext() { return cache; } }
Notes:
- the class extends the
GCUBEStatefulPortTypeContext
- the class adopts the singleton pattern as suggested for any context
- the
getJNDIName()
method returns the JNDI name of the port-type - the
getServiceContext()
method connects the port-type to the service context - the
getNamespace()
method returns the namespace of the port-type as defined in the WSDL interface
The Resource
The Resource class is the core of the statefulness. It models the state of a port-type and the way in which it can be accessed and modified. Our Resource will maintain the state in 2 properties:
- the name of the user
- a counter about how many times it accesses the resource
package org.acme.sample.stateful; import org.gcube.common.core.state.GCUBEWSResource; import org.globus.wsrf.ResourceException; public class Resource extends GCUBEWSResource { protected static final String RP_NAME = "Name"; protected static final String RP_VISITS = "Visits"; protected static String[] RPNames = { RP_NAME, RP_VISITS }; @Override protected void initialise(Object... args) throws ResourceException { if (args.length!=1) throw new IllegalArgumentException(); try { String name = (String) args[0]; this.setName(name); this.setVisits(0); } catch (Exception e) { throw new ResourceException(e); } } /** * {@inheritDoc} */ public String[] getPropertyNames() { return RPNames; } /** * Returns the name of the RP stored on this Resource. * * @return the name. */ public String getName() { return (String) this.getResourcePropertySet().get(RP_NAME).get(0); } /** * Returns the number of visits for the user * @return */ public Integer getVisits() { return (Integer) this.getResourcePropertySet().get(RP_VISITS).get(0); } /** * Sets the name of the property. * * @throws Exception */ protected synchronized void setName(String name) throws Exception { this.getResourcePropertySet().get(RP_NAME).clear(); this.getResourcePropertySet().get(RP_NAME).add(name); } /** * Sets the name of the property. * * @throws Exception */ protected synchronized void setVisits(Integer visits) throws Exception { this.getResourcePropertySet().get(RP_VISITS).clear(); this.getResourcePropertySet().get(RP_VISITS).add(visits); } }
Notes:
- the class overrides the
initialise()
method to perform a custom initialisation of the properties - the two properties are not maintained as private members of the class, they are transparently managed by the superclass in a
GCUBEWSResourcePropertySet
instance. In order to do that the class:- declares the name of the two properties
- overrides the
getPropertyNames()
method to return the property names
- the getters and setters implementation of the properties reflects the
GCUBEWSResourcePropertySet
management of such properties
The Resource Home
The implementation of the Resource Home is very simple, since most of the work is performed by the superclass behind the scene. All it is needed is to override a method to connect the Home to the port-type context.
package org.acme.sample.stateful; import org.gcube.common.core.contexts.GCUBEStatefulPortTypeContext; import org.gcube.common.core.state.GCUBEWSHome; public class Home extends GCUBEWSHome { @Override public GCUBEStatefulPortTypeContext getPortTypeContext() { return StatefulContext.getPortTypeContext(); } }
Notes:
- the class extends the
GCUBEWSHome
class - the
getPortTypeContext()
method connects the class to the stateful port-type
The Service instance port-type
The Service
class provides an implementation of the Service instance port-type defined in the WSDL interface.
package org.acme.sample.stateful; import org.acme.sample.ServiceContext; import org.gcube.common.core.contexts.GCUBEStatefulPortTypeContext; import org.gcube.common.core.contexts.GHNContext; import org.gcube.common.core.faults.GCUBEFault; import org.gcube.common.core.faults.GCUBEUnrecoverableException; import org.gcube.common.core.types.VOID; import org.globus.wsrf.ResourceException; public class Service { public String aboutSF(VOID voidType) throws GCUBEFault { StringBuilder output = new StringBuilder(); GHNContext nctx = GHNContext.getContext(); ServiceContext sctx = ServiceContext.getContext(); GCUBEStatefulPortTypeContext pctx = StatefulContext.getPortTypeContext(); try { final Resource resource = this.getResource(); resource.setVisits(resource.getVisits() + 1); output.append("Hello " + resource.getName()).append(", you have invoked porttype "). append(pctx.getName() + " \nof service " + sctx.getName()). append(", \nwhich you found at "). append(pctx.getEPR() + "in the gCube infrastructure " + nctx.getGHN().getInfrastructure()). append( " \nand you are in the Scope " + sctx.getScope()). append(" \nThis is your invocation N." + resource.getVisits() + "\n"); if (resource.getVisits() >= (Integer)pctx.getProperty(StatefulContext.FREQUENT_USER_LIMIT_JNDI_NAME, true)) { output.append("welcome in the frequent user club!"); } } catch (Exception e) { throw new GCUBEUnrecoverableException(e).toFault(); } return output.toString(); } /** * * @return the stateful resource * @throws ResourceException if no resource was found in the current context */ private Resource getResource() throws ResourceException { return (Resource) StatefulContext.getPortTypeContext().getWSHome().find(); } }
Notes:
- the class implements the aboutSF operation in the
aboutSF()
method - the method retrieves various contexts to use when producing the output string
- the most interesting part of the class is the
getResource()
method demonstrating the way to access from the stateful context the actualResource
instance
The Factory port-type
The Factory
class provides an implementation of the Factory port-type defined in the WSDL interface.
package org.acme.sample.stateful; import org.apache.axis.message.addressing.EndpointReferenceType; import org.gcube.common.core.contexts.GCUBEStatefulPortTypeContext; import org.gcube.common.core.faults.GCUBEFault; import org.gcube.common.core.faults.GCUBEUnrecoverableException; public class Factory { public EndpointReferenceType logon(String name) throws GCUBEFault { //create/reuse the resource try { GCUBEStatefulPortTypeContext ptcxt = StatefulContext.getPortTypeContext(); return ptcxt.getWSHome().create(ptcxt.makeKey(name), name).getEPR(); } catch (Exception e) { throw new GCUBEUnrecoverableException(e).toFault(); } } }
Notes:
- the class implements the logon operation in the
logon
method - the method retrieves the Stateful context and from it retrieves also the
Home
instance - by invoking the
create
method, the stateful resource is created with the given key (first input parameter) and with the given list of parameters (only thename
variable here). The list is then passed to theinitialise()
method of theResource
instance - the
makeKey()
method of theStatefulContext
instance creates a newGCUBEWSResourceKey
- the
getEPR()
method of theResource
instance return the EndPointReference to use to access the new state from clients
Service folder tree after the implementation
All the java files described has to be placed in the src/org/acme/sample/stateful folder under the service location:
|-SampleService |--etc |---profile.xml |---deploy-jndi-config.xml |---deploy-server.wsdd |---build.properties | |--src |---org |----acme |-----sample |------ServiceContext.java |------stateless |-------Stateless.java |------stateful |-------StatefulContext.java |-------Resource.java |-------Home.java |-------Service.java |-------Factory.java |------tests |-------StatelessTest.java | |--schema |---Stateless.wsdl |---Factory.wsdl |---Stateful.wsdl | | |--build.xml | |-Dependencies |--SampleService
JNDI configuration
The deploy-jndi-config.xml file must be updated in order to add the configuration of the stateful port-type. The stateful configuration has to declare the "home" resource that instructs gCore about how to create a new stateful resource.
This configuration is automatically loaded by the gCore in the StatefulContext
instance from which the configuration can be accessed programmatically.
<?xml version="1.0" encoding="UTF-8"?> <jndiConfig xmlns="http://wsrf.globus.org/jndi/config"> <service name="acme/sample"> <environment name="configDir" value="@config.dir@" type="java.lang.String" override="false" /> </service> <service name="acme/sample/stateful"> <resource name="home" type="org.acme.sample.stateful.Home"> <resourceParams> <parameter> <name>factory</name> <value>org.globus.wsrf.jndi.BeanFactory</value> </parameter> <parameter> <name>resourceClass</name> <value>org.acme.sample.stateful.Resource</value> </parameter> </resourceParams> </resource> <environment name="frequentUserLimit" value="3" type="java.lang.Integer" override="false" /> </service> </jndiConfig>
The following is worth noticing:
- the JNDI still included the mandatory
service
element entirely dedicated to the SampleService as a whole - the
service
element named acme/sample/stateful groups the configuration of our stateful port-type; here it only includes the Home resource and a custom property. In the section How to publish the state we will see other configuration elements to add in this service element allowing to publish the service state - the
frequentUserLimit
environment element shows an example of custom property that can be programmatically read within the service code
Save the new configuration in the file called deploy-jndi-config.xml and place it in the etc folder under the service location:
|-SampleService |--etc |---profile.xml |---deploy-jndi-config.xml |---deploy-server.wsdd |---build.properties | |--src |---org |----acme |-----sample |------ServiceContext.java |------stateless |-------Stateless.java |------stateful |-------StatefulContext.java |-------Resource.java |-------Home.java |-------Service.java |-------Factory.java |------tests |-------StatelessTest.java | |--schema |---Stateless.wsdl |---Factory.wsdl |---Stateful.wsdl | | |--build.xml | |-Dependencies |--SampleService
Building & Deploying
Towards Deployment: the WSDD descriptor
The two new port-types have to be declared in the deployment descriptor as follows.
<?xml version="1.0" encoding="UTF-8"?> <deployment name="defaultServerConfig" xmlns="http://xml.apache.org/axis/wsdd/" xmlns:java="http://xml.apache.org/axis/wsdd/providers/java" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <service name="acme/sample/stateless" provider="Handler" use="literal" style="document"> <parameter name="className" value="org.acme.sample.stateless.Stateless"/> <wsdlFile>share/schema/org.acme.sample/Stateless_service.wsdl</wsdlFile> <parameter name="allowedMethods" value="*"/> <parameter name="handlerClass" value="org.globus.axis.providers.RPCProvider"/> <parameter name="scope" value="Application"/> <parameter name="loadOnStartup" value="true"/> <parameter name="securityDescriptor" value="@config.dir@/security_descriptor.xml"/> </service> <service name="acme/sample/stateful" provider="Handler" use="literal" style="document"> <parameter name="className" value="org.acme.sample.stateful.Service"/> <wsdlFile>share/schema/org.acme.sample/Stateful_service.wsdl</wsdlFile> <parameter name="allowedMethods" value="*"/> <parameter name="handlerClass" value="org.globus.axis.providers.RPCProvider"/> <parameter name="scope" value="Application"/> <parameter name="providers" value="GCUBEProvider"/> <parameter name="loadOnStartup" value="true"/> <parameter name="securityDescriptor" value="@config.dir@/security_descriptor.xml"/> </service> <service name="acme/sample/factory" provider="Handler" use="literal" style="document"> <parameter name="className" value="org.acme.sample.stateful.Factory"/> <wsdlFile>share/schema/org.acme.sample/Factory_service.wsdl</wsdlFile> <parameter name="allowedMethods" value="*"/> <parameter name="handlerClass" value="org.globus.axis.providers.RPCProvider"/> <parameter name="scope" value="Application"/> <parameter name="loadOnStartup" value="true"/> <parameter name="securityDescriptor" value="@config.dir@/security_descriptor.xml"/> </service> </deployment>
The deploy-server.wsdd file has to be updated with the above content in the etc folder under the service location:
|-SampleService |--etc |---profile.xml |---deploy-jndi-config.xml |---deploy-server.wsdd |---build.properties | |--src |---org |----acme |-----sample |------ServiceContext.java |------stateless |-------Stateless.java |------stateful |-------StatefulContext.java |-------Resource.java |-------Home.java |-------Service.java |-------Factory.java |------tests |-------StatelessTest.java | |--schema |---Stateless.wsdl |---Factory.wsdl |---Stateful.wsdl | | |--build.xml | |-Dependencies |--SampleService
Configuring the build process
The build properties configuration file has now to declare the two new port-types to build.
package = org.acme.sample lib.dir = Dependencies/SampleService wsdl.1 = Stateless wsdl.2 = Stateful wsdl.3 = Factory namespace.1=http://acme.org/sample
The build.properties file has to be updated with the above content in the etc folder under the service location:
|-SampleService |--etc |---profile.xml |---deploy-jndi-config.xml |---deploy-server.wsdd |---build.properties | |--src |---org |----acme |-----sample |------ServiceContext.java |------stateless |-------Stateless.java |------stateful |-------StatefulContext.java |-------Resource.java |-------Home.java |-------Service.java |-------Factory.java |------tests |-------StatelessTest.java | |--schema |---Stateless.wsdl |---Factory.wsdl |---Stateful.wsdl | | |--build.xml | |-Dependencies |--SampleService
Building the stubs and the service
The building process does not change. The same steps seen in the Stateless part of the tutorial have to be performed for building the stubs and the service.
(Un)Deploying the service
The (un)deploying process does not change. The same steps seen in the Stateless part of the tutorial have to be performed for deploying and undeploying the service.
A Test Client
package org.acme.sample.tests; import org.acme.sample.stubs.FactoryPortType; import org.acme.sample.stubs.StatefulPortType; import org.acme.sample.stubs.service.FactoryServiceAddressingLocator; import org.acme.sample.stubs.service.StatefulServiceAddressingLocator; import org.apache.axis.message.addressing.AttributedURI; import org.apache.axis.message.addressing.EndpointReferenceType; import org.gcube.common.core.scope.GCUBEScope; import org.gcube.common.core.types.VOID; import org.gcube.common.core.utils.logging.GCUBEClientLog; import org.gcube.common.core.contexts.GCUBERemotePortTypeContext; public class StatefulTest { static GCUBEClientLog logger = new GCUBEClientLog(StatefulTest.class); public static void main(String[] args) throws Exception { logger.debug("Stateful client is running..."); EndpointReferenceType factory_endpoint = new EndpointReferenceType(); factory_endpoint.setAddress(new AttributedURI(args[0])); FactoryPortType factoryPT = new FactoryServiceAddressingLocator().getFactoryPortTypePort(factory_endpoint); //we proxy the factory PT with the desired scope factoryPT = GCUBERemotePortTypeContext.getProxy(factoryPT, GCUBEScope.getScope(args[2])); EndpointReferenceType service_endpoint = factoryPT.logon(args[1]); StatefulPortType statefulPT = new StatefulServiceAddressingLocator().getStatefulPortTypePort(service_endpoint); // then we have to proxy also the stateful PT... statefulPT = GCUBERemotePortTypeContext.getProxy(statefulPT, GCUBEScope.getScope(args[2])); System.out.println(statefulPT.aboutSF(new VOID())); //... but only once, if we use it again, there is no need to proxy again for subsequent uses System.out.println(statefulPT.aboutSF(new VOID())); } }
Save the file StatefulTest.java under the src/org/acme/test folder under the service location.
Final structure of the service location
At the end of this section, the service location tree should look as follows:
|-SampleService |--etc |---profile.xml |---deploy-jndi-config.xml |---deploy-server.wsdd |---build.properties | |--src |---org |----acme |-----sample |------ServiceContext.java |------stateless |-------Stateless.java |------stateful |-------StatefulContext.java |-------Resource.java |-------Home.java |-------Service.java |-------Factory.java |------tests |-------StatelessTest.java |-------StatefulTest.java | |--schema |---Stateless.wsdl |---Factory.wsdl |---Stateful.wsdl | | |--build.xml | |-Dependencies |--SampleService