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An advanced email server - JPA backend with guice injection

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package org.apache.james.modules.mailbox;

import java.io.IOException;

import org.apache.james.filesystem.api.FileSystem;
import org.apache.james.mailbox.events.MailboxListener;
import org.apache.james.mailbox.lucene.search.LuceneMessageSearchIndex;
import org.apache.james.mailbox.store.search.ListeningMessageSearchIndex;
import org.apache.james.mailbox.store.search.MessageSearchIndex;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

import com.google.inject.AbstractModule;
import com.google.inject.Provides;
import com.google.inject.Scopes;
import com.google.inject.Singleton;
import com.google.inject.multibindings.Multibinder;

public class LuceneSearchMailboxModule extends AbstractModule {

    @Override
    protected void configure() {
        bind(LuceneMessageSearchIndex.class).in(Scopes.SINGLETON);
        bind(MessageSearchIndex.class).to(LuceneMessageSearchIndex.class);
        bind(ListeningMessageSearchIndex.class).to(LuceneMessageSearchIndex.class);

        Multibinder.newSetBinder(binder(), MailboxListener.GroupMailboxListener.class)
            .addBinding()
            .to(LuceneMessageSearchIndex.class);
    }

    @Provides
    @Singleton
    Directory provideDirectory(FileSystem fileSystem) throws IOException {
        return FSDirectory.open(fileSystem.getBasedir());
    }
}