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 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
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 * software distributed under the License is distributed on an  *
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 * under the License.                                           *
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package org.apache.james.modules.mailbox;

import java.util.Set;

import org.apache.james.backends.cassandra.components.CassandraModule;
import org.apache.james.backends.cassandra.init.KeyspaceFactory;
import org.apache.james.backends.cassandra.init.SessionWithInitializedTablesFactory;
import org.apache.james.backends.cassandra.init.configuration.ClusterConfiguration;
import org.apache.james.backends.cassandra.init.configuration.InjectionNames;
import org.apache.james.backends.cassandra.init.configuration.KeyspaceConfiguration;

import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.Session;
import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import com.google.inject.Provides;
import com.google.inject.Scopes;
import com.google.inject.Singleton;
import com.google.inject.multibindings.Multibinder;
import com.google.inject.name.Named;
import com.google.inject.name.Names;

public class CassandraCacheSessionModule extends AbstractModule {
    @Override
    protected void configure() {
        bind(InitializedCacheCluster.class).in(Scopes.SINGLETON);
        Multibinder.newSetBinder(binder(), CassandraModule.class, Names.named(InjectionNames.CACHE));
    }

    @Named(InjectionNames.CACHE)
    @Provides
    @Singleton
    KeyspaceConfiguration provideCacheKeyspaceConfiguration(KeyspacesConfiguration keyspacesConfiguration) {
        return keyspacesConfiguration.cacheKeyspaceConfiguration();
    }

    @Singleton
    @Named(InjectionNames.CACHE)
    @Provides
    Session provideSession(@Named(InjectionNames.CACHE) KeyspaceConfiguration keyspaceConfiguration,
                           InitializedCacheCluster cluster,
                           @Named(InjectionNames.CACHE) CassandraModule module) {
        return new SessionWithInitializedTablesFactory(keyspaceConfiguration, cluster.cluster, module).get();
    }

    @Named(InjectionNames.CACHE)
    @Provides
    @Singleton
    CassandraModule composeCacheDefinitions(@Named(InjectionNames.CACHE) Set<CassandraModule> modules) {
        return CassandraModule.aggregateModules(modules);
    }

    static class InitializedCacheCluster {
        private final Cluster cluster;

        @Inject
        private InitializedCacheCluster(Cluster cluster, ClusterConfiguration clusterConfiguration, KeyspacesConfiguration keyspacesConfiguration) {
            this.cluster = cluster;

            if (clusterConfiguration.shouldCreateKeyspace()) {
                KeyspaceFactory.createKeyspace(keyspacesConfiguration.cacheKeyspaceConfiguration(), cluster);
            }
        }
    }
}
