我是OPC UA的新手，对触发on ...方法的方式感到困惑。 从TestStackServer引用示例：
TestStackExample.java：
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package org.opcfoundation.ua.examples;
import java.net.InetAddress;
import java.net.URI;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.opcfoundation.ua.application.Application;
import org.opcfoundation.ua.application.Client;
import org.opcfoundation.ua.application.Server;
import org.opcfoundation.ua.application.TestStackService;
import org.opcfoundation.ua.builtintypes.Variant;
import org.opcfoundation.ua.core.EndpointDescription;
import org.opcfoundation.ua.core.MessageSecurityMode;
import org.opcfoundation.ua.core.TestStackRequest;
import org.opcfoundation.ua.core.TestStackResponse;
import org.opcfoundation.ua.examples.certs.ExampleKeys;
import org.opcfoundation.ua.transport.ServiceChannel;
import org.opcfoundation.ua.transport.security.Cert;
import org.opcfoundation.ua.transport.security.CertificateValidator;
import org.opcfoundation.ua.transport.security.KeyPair;
import org.opcfoundation.ua.transport.security.PrivKey;
import org.opcfoundation.ua.transport.security.SecurityMode;
import org.opcfoundation.ua.transport.security.SecurityPolicy;
import org.opcfoundation.ua.utils.EndpointUtil;
/**
* This example creates both a server and a client.
* The server is bound to port 6001 and serves to TestStack requests (See {@link TestStackService}) with echo.
* The client connects to the server and makes a simple "Hello World" request and receives
* corresponding "Hello World" resopnse.
*
*/
public class TestStackExample {
public static void main(String[] args) throws Exception {
////////////// SERVER //////////////
// Create UA Server Application
Application myServerApplication = new Application();
myServerApplication.getOpctcpSettings().setCertificateValidator( CertificateValidator.ALLOW_ALL );
myServerApplication.getHttpsSettings().setCertificateValidator( CertificateValidator.ALLOW_ALL );
myServerApplication.getHttpsSettings().setHostnameVerifier( SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER );
// Create UA Service Server
Server myServer = new Server( myServerApplication );
// Add a service to the server - TestStack echo
myServer.addServiceHandler( new TestStackService() );
// Load Servers's Application Instance Certificate from file
KeyPair myServerApplicationInstanceCertificate = ExampleKeys.getKeyPair("server", 2048);
KeyPair myServerHttpsKey = ExampleKeys.getKeyPair("https_server", 2048);
// Add application instance certificate
myServerApplication.addApplicationInstanceCertificate( myServerApplicationInstanceCertificate );
myServerApplication.getHttpsSettings().setKeyPair( myServerHttpsKey );
// Bind the endpoint for each network interface
String hostname = EndpointUtil.getHostname();
for (String addr : EndpointUtil.getInetAddressNames()) {
String bindAddress = "opc.tcp://"+addr+":6002/UAExample";
String endpointAddress = "opc.tcp://"+hostname+":6002/UAExample";
myServer.bind(bindAddress, endpointAddress, SecurityMode.ALL);
}
//////////////////////////////////////
////////////// CLIENT //////////////
// Load Client's Application Instance Certificate from file
KeyPair myClientApplicationInstanceCertificate = ExampleKeys.getKeyPair("client", 2048);
// Create Client
Client myClient = Client.createClientApplication( myClientApplicationInstanceCertificate );
//////////////////////////////////////
/////////// DISCOVER ENDPOINT ////////
// Discover server's endpoints, and choose one
EndpointDescription[] endpoints = myClient.discoverEndpoints( "opc.tcp://"+hostname+":6002/" ); //51210=Sample Server
// Filter out all but opc.tcp protocol endpoints
endpoints = EndpointUtil.selectByProtocol(endpoints, "opc.tcp");
// Filter out all but Signed & Encrypted endpoints
endpoints = EndpointUtil.selectByMessageSecurityMode(endpoints, MessageSecurityMode.SignAndEncrypt);
// Filter out all but Basic128 cryption endpoints
endpoints = EndpointUtil.selectBySecurityPolicy(endpoints, SecurityPolicy.BASIC128RSA15);
// Sort endpoints by security level. The lowest level at the beginning, the highest at the end of the array
endpoints = EndpointUtil.sortBySecurityLevel(endpoints);
// Choose one endpoint
EndpointDescription endpoint = endpoints[endpoints.length-1];
//////////////////////////////////////
//////////// TEST-STACK ////////////
// Create Channel
ServiceChannel myChannel = myClient.createServiceChannel( endpoint );
// Create Test Request
TestStackRequest req = new TestStackRequest(null, null, null, new Variant( "Hello World" ));
System.out.println("REQUEST: "+req);
// Invoke service
TestStackResponse res = myChannel.TestStack(req);
// Print result
System.out.println("RESPONSE: "+res);
//////////////////////////////////////
///////////// SHUTDOWN /////////////
// Close channel
myChannel.closeAsync();
// Unbind endpoint. This also closes the socket 6001 as it has no more endpoints.
myServer.getApplication().close();
//////////////////////////////////////
}
}
TestStackService.java
package org.opcfoundation.ua.application;
import org.opcfoundation.ua.common.ServiceFaultException;
import org.opcfoundation.ua.core.TestServiceSetHandler;
import org.opcfoundation.ua.core.TestStackExRequest;
import org.opcfoundation.ua.core.TestStackExResponse;
import org.opcfoundation.ua.core.TestStackRequest;
import org.opcfoundation.ua.core.TestStackResponse;
import org.opcfoundation.ua.transport.endpoint.EndpointServiceRequest;
/**
* Service handler that implements stack test
*
*/
public class TestStackService implements TestServiceSetHandler {
public void onTestStack(EndpointServiceRequest<TestStackRequest, TestStackResponse> req) throws ServiceFaultException {
req.sendResponse( new TestStackResponse(null, req.getRequest().getInput() ) );
}
public void onTestStackEx(EndpointServiceRequest<TestStackExRequest, TestStackExResponse> req) throws ServiceFaultException {
TestStackExResponse res = new TestStackExResponse();
res.setOutput( req.getRequest().getInput() );
req.sendResponse( res );
}
}
我找不到任何java事件/侦听器导入包或对......方法的任何方法调用。这些方法是如何触发的？
答案 0 :(得分：0)
这是关键：
// Add a service to the server - TestStack echo
myServer.addServiceHandler( new TestStackService() );
服务器然后触发TestStackRequest由TestStackService（它实现相应的接口）处理。