Publish-Subscribe

Tianming GUO

RICM5

• Publisher(Editeur)
• Mediator(Médiateur)
• Subscriber(Abonné)

1. Sub-pub Introduction

RÔLE

Publisher

Mediator

Subscriber

caractéristique

• Content-based routing
• TCP /UDP/Multicast UDP /Broadcast (in LAN)/mix
• LAN/WAN
• Realtime / Non
• QoS / Non
• Centralisé/Distribué 
• Atomicité
• Médiateur/Direct

1. Sub-pub Introduction

Publisher_1

Publisher_2

Mediator

Subscriber_1

Subscriber_2

Subscriber_3

1. Sub-pub Introduction

2. PROTOCOLS & API

OSGi Event-Admin service -- Apache felix

        String[] topics = new String[] {
            "com/acme/reportgenerator/GENERATED"
        };
        
        Dictionary props = new Hashtable();
        props.put(EventConstants.EVENT_TOPIC, topics);
        props.put(EventConstants.EVENT_FILTER, "(title=samplereport)");
        bundleContext.registerService(EventHandler.class.getName(), new ReportEventHandler() , props);

public class ReportEventHandler implements EventHandler
{
    public void handleEvent(Event event)
    {
        String reportTitle = (String) event.getProperty("title");
        String reportPath = (String) event.getProperty("path");
        
        sendReportByEmail(reportTitle, reportPath);
    }