Example for event handling

[Shivam Poddar]

Hi

I need to implement triggers in my hypergraph but I'm not able to figure out how to do that.

Can anyone just provide an example whi prints a simple message, say "hello" whenever a new atom is added.

[Alain]

Shivam,

Here is an example that we use in a test class

import org.hypergraphdb.HyperGraph;
import org.hypergraphdb.event.HGAtomAddedEvent;
import org.hypergraphdb.event.HGEvent;
import org.hypergraphdb.event.HGListener;

public class AtomAddiedListener implements HGListener {

@Override
public Result handle(HyperGraph graph, HGEvent e) {
HGAtomAddedEvent event = (HGAtomAddedEvent)e;

System.out.println("Atom added: " + graph.get(event.getAtomHandle())); //$NON-NLS-1$

return Result.ok;
}
}

and this is activated with:

graph.getEventManager().addListener(HGAtomAddedEvent.class, new AtomAddedListener());

You can look at the peer/StorageService for an example in the HG code base.

HTH,

Alain

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[Shivam Poddar]

Thanks for the example. 😃

On Sunday, September 8, 2019 at 2:34:00 PM UTC+5:30, Alain wrote:

Shivam,

Here is an example that we use in a test class

import org.hypergraphdb.HyperGraph;
import org.hypergraphdb.event.HGAtomAddedEvent;
import org.hypergraphdb.event.HGEvent;
import org.hypergraphdb.event.HGListener;

public class AtomAddiedListener implements HGListener {

@Override
public Result handle(HyperGraph graph, HGEvent e) {
HGAtomAddedEvent event = (HGAtomAddedEvent)e;

System.out.println("Atom added: " + graph.get(event.getAtomHandle())); //$NON-NLS-1$

return Result.ok;
}
}

and this is activated with:

graph.getEventManager().addListener(HGAtomAddedEvent.class, new AtomAddedListener());

You can look at the peer/StorageService for an example in the HG code base.

HTH,

Alain

On Fri, Sep 6, 2019 at 2:40 AM Shivam Poddar <shivampo...@gmail.com> wrote:

Hi

I need to implement triggers in my hypergraph but I'm not able to figure out how to do that.

Can anyone just provide an example whi prints a simple message, say "hello" whenever a new atom is added.

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