<dependency>
    <groupId>com.feixc.xsimple</groupId>
    <artifactId>eventx</artifactId>
    <version>1.0.0</version>
</dependency>

package xxx.yyy.zzz;

import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.feixc.xsimple.eventx.BaseEventHandler;
import com.feixc.xsimple.eventx.Event;
import com.feixc.xsimple.eventx.EventHandler;
import com.feixc.xsimple.eventx.EventPriority;

@EventHandler("/test")
public class TestHandler extends BaseEventHandler {

    @Event("aa")
    public void aa(Map<String, Object> params) {
        String a = getParam(params, "a", String.class, true);
        int b = getParam(params, "b", Integer.class, true);
        Long c = getParam(params, "c", Long.class, false);
        Boolean d = getParam(params, "d", Boolean.class, false);

        // do something
    }

    @Event(value = "bb", priority = EventPriority.MIDDLE)
    public void bb(Map<String, Object> params) {
        // do something
    }

    @Event(value = "cc", priority = EventPriority.LOW)
    public void cc(Map<String, Object> params) {
        // do something
    }
}

<bean id="eventDispatcher" class="org.opensource.xsimple.eventx.EventDispatcher">
    <constructor name="handlerPackage" value="xxx.yyy.zzz" />
</bean>

Map<String, Object> params = new HashMap<String, Object>();
params.put("a", "aaaaaaaaaa");
params.put("b", 1234);
params.put("c", 0);
params.put("d", true);

EventX.sendEvent("/test/aa", params);