## Extension Points

Gitblit offers several extension points for enhancing and customizing it's runtime behavior.

Each available extension point has a sample implementation in the [gitblit-cookbook-plugin (Maven project)](https://dev.gitblit.com/summary/gitblit-cookbook-plugin.git).

### SSH Dispatch Command

*SINCE 1.5.0*

You can provide your own custom SSH commands by subclassing the *DispatchCommand* class.

```java
import ro.fortsoft.pf4j.Extension;

import com.gitblit.models.UserModel;
import com.gitblit.transport.ssh.commands.CommandMetaData;
import com.gitblit.transport.ssh.commands.DispatchCommand;

@Extension
@CommandMetaData(name = "mycommands", description = "Sample SSH dispatcher")
public class MyDispatcher extends DispatchCommand {

    @Override
    protected void setup(UserModel user) {
        // commands in this dispatcher
        register(user, CommandA.class);
        register(user, CommandB.class);

        // nested dispatchers
        register(user, SubDispatcher1.class);
        register(user, SubDispatcher2.class);
    }
}
```

### Pre- and Post- Receive Hook

*SINCE 1.5.0*

You can provide your own custom pre and/or post receive hooks by subclassing the *ReceiveHook* class.

```java
import com.gitblit.extensions.ReceiveHook;
import java.util.Collection;
import org.eclipse.jgit.transport.ReceiveCommand;
import ro.fortsoft.pf4j.Extension;

@Extension
public class MyReceiveHook extends ReceiveHook {

    @Override
    public void onPreReceive(GitblitReceivePack receivePack, Collection<ReceiveCommand> commands) {
    }

    @Override
    public void onPostReceive(GitblitReceivePack receivePack, Collection<ReceiveCommand> commands) {
    }
}

```

### Patchset Hook

*SINCE 1.5.0*

You can provide your own custom patchset hook by subclassing the *PatchsetHook* class.

```java
import com.gitblit.extensions.PatchsetHook;
import com.gitblit.models.TicketModel;
import ro.fortsoft.pf4j.Extension;

@Extension
public class MyPatchsetHook extends PatchsetHook {

    @Override
    public void onNewPatchset(TicketModel ticket) {
    }

    @Override
    public void onUpdatePatchset(TicketModel ticket) {
    }

    @Override
    public void onMergePatchset(TicketModel ticket) {
    }
}
```

### Ticket Hook

*SINCE 1.5.0*

You can provide your own custom ticket hook by subclassing the *TicketHook* class.

```java
import com.gitblit.extensions.TicketHook;
import com.gitblit.models.TicketModel;
import com.gitblit.models.TicketModel.Change;
import ro.fortsoft.pf4j.Extension;

@Extension
public class MyTicketHook extends TicketHook {

    @Override
    public void onNewTicket(TicketModel ticket) {
    }

    @Override
    public void onUpdateTicket(TicketModel ticket, Change change) {
    }
}
```