我是 Esper 的新手,我想得到一些帮助。我已经设法将 Esper 与 CSV 文件一起使用,但现在我需要使用 Java 对象作为通过套接字发送的事件,而且我在 Internet 上找不到简单的示例来用作指南。
有没有人基于它们的一些简单的例子?
无论如何,我把我正在努力工作的代码放在这里。当我运行它时没有任何反应,似乎套接字连接不起作用。
服务器类(它还包含事件类)。应该发送事件:
import java.io.* ;
import java.net.* ;
class Server {
static final int PORT=5002;
public Server( ) {
try {
ServerSocket skServer = new ServerSocket( PORT );
System.out.println("Listening at " + PORT );
Socket skClient = skServer.accept();
System.out.println("Serving to Esper");
OutputStream aux = skClient.getOutputStream();
ObjectOutputStream flux = new ObjectOutputStream( aux );
int i = 0;
while (i<10) {
flux.writeObject( new MeteoEvent(i,"A") );
i++;
}
flux.flush();
skClient.close();
System.out.println("End of transmission");
} catch( Exception e ) {
System.out.println( e.getMessage() );
}
}
public static void main( String[] arg ) {
new Server();
}
class MeteoEvent{
private int sensorId;
private String GeoArea;
public MeteoEvent() {
}
public MeteoEvent(int sensorid, String geoarea) {
this.sensorId = sensorid;
this.GeoArea = geoarea;
}
public int getSensorId() {
return sensorId;
}
public void setSensorId(int sensorId) {
this.sensorId = sensorId;
}
public String getGeoArea() {
return GeoArea;
}
public void setGeoArea(String geoArea) {
GeoArea = geoArea;
}
}
}
还有基于 Esper 的课程。
import java.io.File;
import java.io.IOException;
import java.sql.SQLException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import com.espertech.esper.client.Configuration;
import com.espertech.esper.client.EPAdministrator;
import com.espertech.esper.client.EPRuntime;
import com.espertech.esper.client.EPServiceProvider;
import com.espertech.esper.client.EPServiceProviderManager;
import com.espertech.esper.client.EPStatement;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.UpdateListener;
import com.espertech.esper.event.map.MapEventBean;
import com.espertech.esperio.socket.EsperIOSocketAdapter;
import com.espertech.esperio.socket.config.ConfigurationSocketAdapter;
import com.espertech.esperio.socket.config.DataType;
import com.espertech.esperio.socket.config.SocketConfig;
public class Demo {
public static class CEPListener implements UpdateListener {
private String tag;
public CEPListener (String tag)
{
this.tag = tag;
}
public static void main(String[] args) throws IOException, InterruptedException {
Configuration configuration = new Configuration();
Map<String, Object> eventProperties = new HashMap<String, Object>();
eventProperties.put("sensorId", int.class);
eventProperties.put("GeoArea", String.class);
configuration.addEventType("MeteoEvent", eventProperties);
ConfigurationSocketAdapter socketAdapterConfig = new ConfigurationSocketAdapter();
SocketConfig socketConfig = new SocketConfig();
socketConfig.setDataType(DataType.OBJECT);
socketConfig.setPort(5002);
socketAdapterConfig.getSockets().put("MeteoSocket", socketConfig);
EPServiceProvider cepService = EPServiceProviderManager.getProvider("MeteoSocket",configuration);
EPRuntime cepServiceRT = cepService.getEPRuntime();
EPAdministrator cepAdmin = cepService.getEPAdministrator();
EsperIOSocketAdapter socketAdapter = new EsperIOSocketAdapter (socketAdapterConfig, "MeteoSocket");
socketAdapter.start();
EPStatement stmt = cepAdmin.createEPL("insert into JoinStream select * from MeteoEvent");
EPStatement outputStatementX = cepAdmin.createEPL("select * from JoinStream");
outputStatementX.addListener(new CEPListener("JS"));
cepService.initialize();
Object lock = new Object();
synchronized (lock)
{
lock.wait();
}
}
如果有人需要一些时间来帮助我,请提前非常感谢。