stack/corepersistence/collection/src/main/java/org/apache/usergrid/persistence/collection/serialization/impl/MvccLogEntrySerializationStrategyV1Impl.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * 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
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.usergrid.persistence.collection.serialization.impl;


import java.util.Collection;
import java.util.Collections;
import java.util.UUID;

import org.apache.cassandra.db.marshal.BytesType;
import org.apache.cassandra.db.marshal.IntegerType;
import org.apache.cassandra.db.marshal.ReversedType;
import org.apache.cassandra.db.marshal.UUIDType;

import org.apache.usergrid.persistence.collection.serialization.SerializationFig;
import org.apache.usergrid.persistence.collection.serialization.impl.util.LegacyScopeUtils;
import org.apache.usergrid.persistence.core.astyanax.IdRowCompositeSerializer;
import org.apache.usergrid.persistence.core.astyanax.MultiTenantColumnFamily;
import org.apache.usergrid.persistence.core.astyanax.MultiTenantColumnFamilyDefinition;
import org.apache.usergrid.persistence.core.astyanax.ScopedRowKey;
import org.apache.usergrid.persistence.core.datastax.TableDefinition;
import org.apache.usergrid.persistence.model.entity.Id;

import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.netflix.astyanax.Keyspace;
import com.netflix.astyanax.serializers.UUIDSerializer;


/**
 * Our v1 row key implementation
 */
@Singleton
public class MvccLogEntrySerializationStrategyV1Impl
    extends MvccLogEntrySerializationStrategyImpl<CollectionPrefixedKey<Id>> {


    private static final IdRowCompositeSerializer ID_SER = IdRowCompositeSerializer.get();

    private static final CollectionScopedRowKeySerializer<Id> ROW_KEY_SER =
        new CollectionScopedRowKeySerializer<Id>( ID_SER );

    private static final MultiTenantColumnFamily<ScopedRowKey<CollectionPrefixedKey<Id>>, UUID> CF_ENTITY_LOG =
        new MultiTenantColumnFamily<>( "Entity_Log", ROW_KEY_SER, UUIDSerializer.get() );


    @Inject
    public MvccLogEntrySerializationStrategyV1Impl( final Keyspace keyspace, final SerializationFig fig ) {
        super( keyspace, fig );
    }


    @Override
    public int getImplementationVersion() {
        return CollectionDataVersions.INITIAL.getVersion();
    }


    @Override
    protected MultiTenantColumnFamily<ScopedRowKey<CollectionPrefixedKey<Id>>, UUID> getColumnFamily() {
        return CF_ENTITY_LOG;
    }


    @Override
    protected ScopedRowKey<CollectionPrefixedKey<Id>> createKey( final Id applicationId, final Id entityId ) {
        final Id ownerId = applicationId;


        final String collectionName = LegacyScopeUtils.getCollectionScopeNameFromEntityType( entityId.getType() );

        final CollectionPrefixedKey<Id> collectionPrefixedKey =
            new CollectionPrefixedKey<>( collectionName, ownerId, entityId );


        final ScopedRowKey<CollectionPrefixedKey<Id>> rowKey =
            ScopedRowKey.fromKey( applicationId, collectionPrefixedKey );

        return rowKey;

    }


    @Override
    protected Id getEntityIdFromKey( final ScopedRowKey<CollectionPrefixedKey<Id>> key ) {
        return key.getKey().getSubKey();
    }


    @Override
    public Collection<MultiTenantColumnFamilyDefinition> getColumnFamilies() {
        //create the CF entity data.  We want it reversed b/c we want the most recent version at the top of the
        //row for fast seeks
        MultiTenantColumnFamilyDefinition cf =
                new MultiTenantColumnFamilyDefinition( CF_ENTITY_LOG, BytesType.class.getSimpleName(),
                        ReversedType.class.getSimpleName() + "(" + UUIDType.class.getSimpleName() + ")",
                        IntegerType.class.getSimpleName(), MultiTenantColumnFamilyDefinition.CacheOption.KEYS );


        return Collections.singleton( cf );
    }

    @Override
    public Collection<TableDefinition> getTables() {

        return Collections.emptyList();
    }
}