Example. The proxy for Grid application C is invoked from grid application A of a different host, from grid application D of the same host, and from client application K outside the Grid.
May 12, 2015 5:01 pm
Here is how to create and invoke application proxies of the Infor Grid.
An application proxy is an interface for a Grid application that other applications of the Grid or client applications outside the Grid can invoke; it is inter-process communication in a distributed environment.
Example. The proxy for Grid application C is invoked from grid application A of a different host, from grid application D of the same host, and from client application K outside the Grid.
To create a proxy for a Grid application:
package net.company.your;
import com.lawson.grid.node.application.ApplicationEntryPoint;
import com.lawson.grid.node.application.ModuleContext;
import com.lawson.grid.proxy.ProxyException;
import com.lawson.grid.proxy.ProxyServer;
public interface HelloWorldProxy {
public String hello(String name) throws ProxyException;
}
public class HelloWorld implements HelloWorldProxy {
public String hello(String name) {
return "Hello, " + name;
}
}
public class HelloWorldApp implements ApplicationEntryPoint {
public boolean startModule(ModuleContext context) {
ProxyServer.registerProxy(HelloWorldProxy.class, new HelloWorld());
return true;
}
public void stopModule() {
}
}
Note: For details on how to create a Grid application, refer to the previous post on the subject.
The proxy is now ready to be invoked:
To invoke the proxy from a Grid application:
The short source code is:
Registry registry = Node.getRegistry();
HelloWorldProxy proxy = registry.getProxy(HelloWorldProxy.class);
String result = proxy.hello("Thibaud");
The long source code is:
package net.company2.your;
import com.lawson.grid.node.application.ApplicationEntryPoint;
import com.lawson.grid.node.application.ModuleContext;
import com.lawson.grid.node.Node;
import com.lawson.grid.proxy.ProxyException;
import com.lawson.grid.registry.Registry;
import net.company.your.HelloWorldProxy;
public class HelloWorldApp2 implements ApplicationEntryPoint {
public boolean startModule(ModuleContext context) {
// connect
Registry registry = Node.getRegistry();
if (!registry.isConnected()) {
System.err.println("failed to connect");
return false;
} else {
System.out.println("connected to " + registry.getGridName());
}
// get the proxy
HelloWorldProxy proxy = (HelloWorldProxy)registry.getProxy(HelloWorldProxy.class);
if (proxy == null) {
System.err.println("failed to get proxy...exiting");
return false;
} else {
System.out.println("got proxy");
}
// invoke the proxy
try {
String result = proxy.hello("Thibaud");
System.out.println(result);
} catch (ProxyException e) {
System.err.println(e.getMessage());
e.printStackTrace();
return false;
}
return true;
}
public void stopModule() {
}
}
To invoke the application proxy from a client application outside the Grid:
First, choose a Grid registry’s hostname and port number (a registry is a special node that keeps track of all nodes in a Grid):
Then, connect to the Grid, get the proxy and invoke its methods.
The short source code is:
ClientRegistry registry = new ClientRegistry("Test");
registry.connect(hostname, portNumber);
HelloWorldProxy proxy = registry.getProxy(HelloWorldProxy.class);
String result = proxy.hello("Thibaud");
The long source code is:
import com.lawson.grid.proxy.ProxyConnectionFailedException;
import com.lawson.grid.proxy.ProxyException;
import com.lawson.grid.proxy.access.GridPrincipal;
import com.lawson.grid.proxy.access.SessionId;
import com.lawson.grid.proxy.access.SessionProvider;
import com.lawson.grid.proxy.access.SessionUtils;
import com.lawson.grid.registry.ClientRegistry;
import net.company.your.HelloWorldProxy;
public class Test {
public static void main(String[] args) {
// connect
ClientRegistry registry = new ClientRegistry("Test");
try {
registry.connect("host1623", 22102);
} catch (ProxyConnectionFailedException e) {
System.err.println(e.getMessage());
e.printStackTrace();
return;
}
if (!registry.isConnected()) {
System.err.println("failed to connect");
return;
} else {
System.out.println("connected to " + registry.getGridName());
}
// get the proxy
HelloWorldProxy proxy = (HelloWorldProxy)registry.getProxy(HelloWorldProxy.class);
if (proxy == null) {
System.err.println("failed to get proxy...exiting");
return;
} else {
System.out.println("got proxy");
}
// invoke the proxy
try {
String result = proxy.hello("Thibaud");
System.out.println(result);
} catch (ProxyException e) {
System.err.println(e.getMessage());
e.printStackTrace();
return;
}
// disconnect
registry.close();
if (!registry.isClosed()) {
System.err.println("failed to close");
} else {
System.out.println("registry closed");
}
}
}
That’s it. Please like, subscribe, share.
Posted by thibaudatwork
Categories: Infor ION Grid
Tags: Grid
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NOTE: compile and execute with classpath to D:\Infor\LifeCycle\?\grid\?\runtimes\1.11.47\resources\grid-core-1.11.47.jar
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