使用Java进行CORBA编程-JacORB-Notification Service(2)

上一篇介绍了CORBA的NotificationService以及如何来使用NotificationService。
上一篇 使用Java进行CORBA编程-JacORB-Notification Service

下面提供使用JacORB的NotificatoinService的一个例程，运行此例子需要启动NameService，
启动方法和例程的启动方法见  使用Java进行CORBA编程-JacORB-入门

另外，还需要启动NotificatoinService，在Windows上可以到JacORB的安装目录下的bin，使用下面的脚本来启动。
需要指定NotificationService使用的端口号，这里是7981。
注意，如果启动中出现错误，可能需要修改JacORB的安装目录下的etc/jacorb.properties文件中的某些设置。

set CLASSPATH=.set CLASSPATH=%CLASSPATH%;../lib/slf4j-api-1.6.4.jarset CLASSPATH=%CLASSPATH%;../lib/slf4j-jdk14-1.6.4.jarset CLASSPATH=%CLASSPATH%;../lib/jacorb.jarset CLASSPATH=%CLASSPATH%;../lib/jacorb-services.jarset CLASSPATH=%CLASSPATH%;../lib/antlr-2.7.2.jarset CLASSPATH=%CLASSPATH%;../lib/picocontainer-1.2.jarset SYSTEM_PROPS=-Djacorb.home=..set SYSTEM_PROPS=%SYSTEM_PROPS% -Dorg.omg.CORBA.ORBClass=org.jacorb.orb.ORBset SYSTEM_PROPS=%SYSTEM_PROPS% -Dorg.omg.CORBA.ORBSingletonClass=org.jacorb.orb.ORBSingletonjava %SYSTEM_PROPS% -cp %CLASSPATH% org.jacorb.notification.ConsoleMain -port 7981 -printCorbaloc

Server代码
1）StructuredPushSupplierImpl.java

package learning.corba.notification.newsbroadcast.server;import org.omg.CosNotification.EventType;import org.omg.CosNotifyComm.InvalidEventType;import org.omg.CosNotifyComm.StructuredPushSupplierPOA;public class StructuredPushSupplierImpl extends StructuredPushSupplierPOA {public void disconnect_structured_push_supplier() {System.out.println("disconnect_structured_push_supplier");}public void subscription_change(EventType[] added, EventType[] removed)throws InvalidEventType {throw new UnsupportedOperationException();}}

2）NewsBCNotifServer.java

package learning.corba.notification.newsbroadcast.server;import java.util.Properties;import java.util.Random;import org.omg.CORBA.IntHolder;import org.omg.CORBA.ORB;import org.omg.CosEventComm.Disconnected;import org.omg.CosNaming.NamingContextExt;import org.omg.CosNaming.NamingContextExtHelper;import org.omg.CosNotification.DefaultPriority;import org.omg.CosNotification.EventHeader;import org.omg.CosNotification.EventType;import org.omg.CosNotification.FixedEventHeader;import org.omg.CosNotification.Priority;import org.omg.CosNotification.Property;import org.omg.CosNotification.StructuredEvent;import org.omg.CosNotifyChannelAdmin.ClientType;import org.omg.CosNotifyChannelAdmin.EventChannel;import org.omg.CosNotifyChannelAdmin.EventChannelFactory;import org.omg.CosNotifyChannelAdmin.EventChannelFactoryHelper;import org.omg.CosNotifyChannelAdmin.StructuredProxyPushConsumer;import org.omg.CosNotifyChannelAdmin.StructuredProxyPushConsumerHelper;import org.omg.CosNotifyChannelAdmin.SupplierAdmin;import org.omg.CosNotifyComm.InvalidEventType;import org.omg.CosNotifyComm.StructuredPushSupplierHelper;import org.omg.PortableServer.POA;import org.omg.PortableServer.POAHelper;public class NewsBCNotifServer implements Runnable {private ORB orb;private StructuredProxyPushConsumer structuredProxyPushConsumer;public static void main(String[] args) {try {Properties props = new Properties();props.put("org.omg.PortableInterceptor.ORBInitializerClass.bidir_init",  "org.jacorb.orb.giop.BiDirConnectionInitializer");ORB orb = ORB.init(args, props);POA rootPoa = POAHelper.narrow(orb.resolve_initial_references("RootPOA"));rootPoa.the_POAManager().activate();NamingContextExt ncExt = NamingContextExtHelper.narrow(orb.resolve_initial_references("NameService"));EventChannelFactory eventChannelFactory = EventChannelFactoryHelper.narrow(orb.resolve_initial_references("NotificationService"));            Property[] initialQos = new Property[0];            Property[] initialAdmin = new Property[0];EventChannel eventChannel = eventChannelFactory.create_channel(initialQos, initialAdmin, new IntHolder());ncExt.rebind(ncExt.to_name("NewsBC.NotifChannel"), eventChannel);StructuredPushSupplierImpl pushSupplierImpl = new StructuredPushSupplierImpl();SupplierAdmin supplierAdmin = eventChannel.default_supplier_admin();StructuredProxyPushConsumer proxyPushConsumer =StructuredProxyPushConsumerHelper.narrow(supplierAdmin.obtain_notification_push_consumer(ClientType.STRUCTURED_EVENT, new IntHolder()));proxyPushConsumer.connect_structured_push_supplier(StructuredPushSupplierHelper.narrow(rootPoa.servant_to_reference(pushSupplierImpl)));Thread t = new Thread(new NewsBCNotifServer(orb, proxyPushConsumer));t.start();orb.run();} catch (Exception e) {e.printStackTrace();}}public NewsBCNotifServer(ORB orb, StructuredProxyPushConsumer proxyPushConsumer) {this.orb = orb;this.structuredProxyPushConsumer = proxyPushConsumer;}public void run() {int i = 0;try {this.structuredProxyPushConsumer.offer_change(new EventType[] { new EventType("NewsBC", "Sports"),  new EventType("NewsBC", "Economy"),  new EventType("NewsBC", "Entertainment")},new EventType[0]);while(!Thread.interrupted()) {EventType eventType = new EventType();eventType.domain_name = "NewsBC";eventType.type_name = (i%3==0)?"Sports":((i%3==1)?"Economy":"Entertainment");EventHeader eventHeader = new EventHeader();eventHeader.fixed_header = new FixedEventHeader();eventHeader.fixed_header.event_type = eventType;eventHeader.fixed_header.event_name = "Event No. " + i++;eventHeader.variable_header = new Property[1];eventHeader.variable_header[0] = new Property();eventHeader.variable_header[0].name = Priority.value;eventHeader.variable_header[0].value = orb.create_any();short priority = (short)(DefaultPriority.value + new Random().nextInt(3));eventHeader.variable_header[0].value.insert_short(priority);StructuredEvent event = new StructuredEvent();event.header = eventHeader;event.filterable_data = new Property[0];event.remainder_of_body = orb.create_any();event.remainder_of_body.insert_string(eventType.type_name + " News, Priority " + priority);this.structuredProxyPushConsumer.push_structured_event(event);Thread.sleep(3000);}} catch (InterruptedException e) {e.printStackTrace();} catch (Disconnected e) {e.printStackTrace();} catch (InvalidEventType e) {e.printStackTrace();}this.structuredProxyPushConsumer.disconnect_structured_push_consumer();this.orb.shutdown(true);}}

Client代码
1）StructuredPushConsumerImpl.java

package learning.corba.notification.newsbroadcast.client;import org.omg.CORBA.TCKind;import org.omg.CosEventComm.Disconnected;import org.omg.CosNotification.EventType;import org.omg.CosNotification.Property;import org.omg.CosNotification.StructuredEvent;import org.omg.CosNotifyComm.InvalidEventType;import org.omg.CosNotifyComm.StructuredPushConsumerPOA;public class StructuredPushConsumerImpl extends StructuredPushConsumerPOA {private String identifier;public StructuredPushConsumerImpl(String identifier) {this.identifier = identifier;}public void disconnect_structured_push_consumer() {System.out.println("disconnect_structured_push_consumer");}public void push_structured_event(StructuredEvent event) throws Disconnected {StringBuilder sb = new StringBuilder();sb.append("[");sb.append(identifier);sb.append("]");sb.append(event.header.fixed_header.event_type.domain_name);sb.append(" ");sb.append(event.header.fixed_header.event_type.type_name);sb.append(",");sb.append(event.header.fixed_header.event_name);sb.append(",");for (Property prop : event.header.variable_header) {sb.append(prop.name);sb.append("=");if (prop.value.type().kind().value() == TCKind._tk_short) {sb.append(prop.value.extract_short());}sb.append(",");}if (event.remainder_of_body.type().kind().value() == TCKind._tk_string) {sb.append(event.remainder_of_body.extract_string());}System.out.println(sb.toString());}public void offer_change(EventType[] added, EventType[] removed)throws InvalidEventType {throw new UnsupportedOperationException();}}

2）NewsBCNotifClient.java

package learning.corba.notification.newsbroadcast.client;import java.util.Properties;import org.omg.CORBA.IntHolder;import org.omg.CORBA.ORB;import org.omg.CORBA.UserException;import org.omg.CosNotification.EventType;import org.omg.CosNotifyChannelAdmin.ClientType;import org.omg.CosNotifyChannelAdmin.ConsumerAdmin;import org.omg.CosNotifyChannelAdmin.EventChannel;import org.omg.CosNotifyChannelAdmin.EventChannelHelper;import org.omg.CosNotifyChannelAdmin.InterFilterGroupOperator;import org.omg.CosNotifyChannelAdmin.ObtainInfoMode;import org.omg.CosNotifyChannelAdmin.StructuredProxyPushSupplierHelper;import org.omg.CosNaming.NamingContextExt;import org.omg.CosNaming.NamingContextExtHelper;import org.omg.CosNotifyChannelAdmin.StructuredProxyPushSupplier;import org.omg.CosNotifyComm.StructuredPushConsumerHelper;import org.omg.CosNotifyFilter.ConstraintExp;import org.omg.CosNotifyFilter.Filter;import org.omg.CosNotifyFilter.FilterFactory;import org.omg.PortableServer.POA;import org.omg.PortableServer.POAHelper;public class NewsBCNotifClient{public static void main(String[] args) {try {Properties props = new Properties();props.put("org.omg.PortableInterceptor.ORBInitializerClass.bidir_init",     "org.jacorb.orb.giop.BiDirConnectionInitializer");ORB orb = ORB.init(args, props);POA rootPoa = POAHelper.narrow(orb.resolve_initial_references("RootPOA"));rootPoa.the_POAManager().activate();NamingContextExt ncExt = NamingContextExtHelper.narrow(orb.resolve_initial_references("NameService"));EventChannel eventChannel = EventChannelHelper.narrow(ncExt.resolve_str("NewsBC.NotifChannel"));createConsumerAllEvents(eventChannel, rootPoa);createConsumerSportsPriority1Events(eventChannel, rootPoa);orb.run();} catch (Exception e) {e.printStackTrace();}}public static void createConsumerAllEvents(EventChannel eventChannel, POA rootPoa)throws UserException {StructuredPushConsumerImpl pushConsumerImpl = new StructuredPushConsumerImpl("CosumerAllEvents");ConsumerAdmin consumerAdmin = eventChannel.default_consumer_admin();StructuredProxyPushSupplier proxyPushSupplier =StructuredProxyPushSupplierHelper.narrow(consumerAdmin.obtain_notification_push_supplier(ClientType.STRUCTURED_EVENT, new IntHolder()));FilterFactory filterFactory = eventChannel.default_filter_factory();//Within a filter, individual constraints are combined using OR semantics.//When multiple filters apply, OR is applied to the combination of results of filters.ConstraintExp constraint1 = new ConstraintExp(new EventType[]{new EventType("NewsBC", "Sports")}, "TRUE");ConstraintExp constraint2 = new ConstraintExp(new EventType[]{new EventType("NewsBC", "Economy")}, "TRUE");Filter filter1 = filterFactory.create_filter("EXTENDED_TCL");        filter1.add_constraints(new ConstraintExp[]{constraint1, constraint2});        ConstraintExp constraint3 = new ConstraintExp(new EventType[]{new EventType("NewsBC", "Entertainment")}, "TRUE");Filter filter2 = filterFactory.create_filter("EXTENDED_TCL");        filter2.add_constraints(new ConstraintExp[]{constraint3});                proxyPushSupplier.add_filter(filter1);        proxyPushSupplier.add_filter(filter2);proxyPushSupplier.connect_structured_push_consumer(StructuredPushConsumerHelper.narrow(rootPoa.servant_to_reference(pushConsumerImpl)));}public static void createConsumerSportsPriority1Events(EventChannel eventChannel, POA rootPoa)throws UserException {StructuredPushConsumerImpl pushConsumerImpl = new StructuredPushConsumerImpl("CosumerSportsPrio1");//When the results of filters associated with a proxy//and those of filters associated with its admin object are combined,//the actual Boolean operator depends on//the value of the MyOperator attribute in the admin object.ConsumerAdmin consumerAdmin = eventChannel.new_for_consumers(InterFilterGroupOperator.AND_OP, new IntHolder());System.out.println(consumerAdmin.MyOperator());StructuredProxyPushSupplier proxyPushSupplier =StructuredProxyPushSupplierHelper.narrow(consumerAdmin.obtain_notification_push_supplier(ClientType.STRUCTURED_EVENT, new IntHolder()));FilterFactory filterFactory = eventChannel.default_filter_factory();ConstraintExp constraint1 = new ConstraintExp(new EventType[]{new EventType("NewsBC", "Sports")},"$Priority<2");Filter filter1 = filterFactory.create_filter("EXTENDED_TCL");        filter1.add_constraints(new ConstraintExp[]{constraint1});        consumerAdmin.add_filter(filter1);        ConstraintExp constraint2 = new ConstraintExp(new EventType[]{new EventType("NewsBC", "Sports")},"$.header.variable_header(Priority)>0");Filter filter2 = filterFactory.create_filter("EXTENDED_TCL");        filter2.add_constraints(new ConstraintExp[]{constraint2});        proxyPushSupplier.add_filter(filter2);        proxyPushSupplier.connect_structured_push_consumer(StructuredPushConsumerHelper.narrow(rootPoa.servant_to_reference(pushConsumerImpl)));EventType[] eventTypes = proxyPushSupplier.obtain_offered_types(ObtainInfoMode.ALL_NOW_UPDATES_OFF);for (EventType eventType : eventTypes) {System.out.println(eventType.domain_name + "." + eventType.type_name);}}}