org.apache.james.modules.event.RabbitMQEventBusModule Maven / Gradle / Ivy

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package org.apache.james.modules.event;

import org.apache.james.event.json.EventSerializer;
import org.apache.james.lifecycle.api.Startable;
import org.apache.james.mailbox.events.EventBus;
import org.apache.james.mailbox.events.MailboxIdRegistrationKey;
import org.apache.james.mailbox.events.RabbitMQEventBus;
import org.apache.james.mailbox.events.RegistrationKey;
import org.apache.james.mailbox.events.RetryBackoffConfiguration;
import org.apache.james.utils.InitialisationOperation;

import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import com.google.inject.Scopes;
import com.google.inject.multibindings.Multibinder;

public class RabbitMQEventBusModule extends AbstractModule {

    @Override
    protected void configure() {
        bind(EventSerializer.class).in(Scopes.SINGLETON);

        bind(RabbitMQEventBus.class).in(Scopes.SINGLETON);
        bind(EventBus.class).to(RabbitMQEventBus.class);

        Multibinder.newSetBinder(binder(), RegistrationKey.Factory.class)
            .addBinding().to(MailboxIdRegistrationKey.Factory.class);

        Multibinder.newSetBinder(binder(), InitialisationOperation.class)
            .addBinding().to(RabbitMQEventBusInitializer.class);

        bind(RetryBackoffConfiguration.class).toInstance(RetryBackoffConfiguration.DEFAULT);
    }

    static class RabbitMQEventBusInitializer implements InitialisationOperation {
        private final RabbitMQEventBus rabbitMQEventBus;

        @Inject
        RabbitMQEventBusInitializer(RabbitMQEventBus rabbitMQEventBus) {
            this.rabbitMQEventBus = rabbitMQEventBus;
        }

        @Override
        public void initModule() {
            rabbitMQEventBus.start();
        }

        @Override
        public Class forClass() {
            return RabbitMQEventBus.class;
        }
    }
}