info.archinnov.achilles.context.CQLDaoContextBuilder.java Source code

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Here is the source code for info.archinnov.achilles.context.CQLDaoContextBuilder.java

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/**
 *
 * Copyright (C) 2012-2013 DuyHai DOAN
 *
 * Licensed 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 info.archinnov.achilles.context;

import static info.archinnov.achilles.entity.metadata.EntityMeta.*;
import info.archinnov.achilles.counter.AchillesCounter.CQLQueryType;
import info.archinnov.achilles.entity.metadata.EntityMeta;
import info.archinnov.achilles.statement.cache.StatementCacheKey;
import info.archinnov.achilles.statement.prepared.CQLPreparedStatementGenerator;

import java.util.HashMap;
import java.util.Map;

import com.datastax.driver.core.PreparedStatement;
import com.datastax.driver.core.Session;
import com.google.common.base.Function;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.collect.Maps;

public class CQLDaoContextBuilder {
    private static final Integer PREPARED_STATEMENT_LRU_CACHE_SIZE = 5000;
    private CQLPreparedStatementGenerator queryGenerator = new CQLPreparedStatementGenerator();
    private Session session;

    private Function<EntityMeta, PreparedStatement> insertPSTransformer = new Function<EntityMeta, PreparedStatement>() {
        @Override
        public PreparedStatement apply(EntityMeta meta) {
            return queryGenerator.prepareInsertPS(session, meta);
        }
    };

    private Function<EntityMeta, PreparedStatement> selectEagerPSTransformer = new Function<EntityMeta, PreparedStatement>() {
        @Override
        public PreparedStatement apply(EntityMeta meta) {
            return queryGenerator.prepareSelectEagerPS(session, meta);
        }
    };

    private Function<EntityMeta, Map<String, PreparedStatement>> removePSTransformer = new Function<EntityMeta, Map<String, PreparedStatement>>() {
        @Override
        public Map<String, PreparedStatement> apply(EntityMeta meta) {
            return queryGenerator.prepareRemovePSs(session, meta);
        }

    };

    private Function<EntityMeta, Map<CQLQueryType, PreparedStatement>> clusteredCounterTransformer = new Function<EntityMeta, Map<CQLQueryType, PreparedStatement>>() {
        @Override
        public Map<CQLQueryType, PreparedStatement> apply(EntityMeta meta) {
            return queryGenerator.prepareClusteredCounterQueryMap(session, meta);
        }
    };

    public static CQLDaoContextBuilder builder(Session session) {
        return new CQLDaoContextBuilder(session);
    }

    public CQLDaoContextBuilder(Session session) {
        this.session = session;
    }

    public CQLDaoContext build(Map<Class<?>, EntityMeta> entityMetaMap, boolean hasSimpleCounter) {
        Map<Class<?>, PreparedStatement> insertPSMap = new HashMap<Class<?>, PreparedStatement>(
                Maps.transformValues(Maps.filterValues(entityMetaMap, excludeClusteredCounterFilter),
                        insertPSTransformer));

        Map<Class<?>, PreparedStatement> selectEagerPSMap = new HashMap<Class<?>, PreparedStatement>(
                Maps.transformValues(entityMetaMap, selectEagerPSTransformer));

        Map<Class<?>, Map<String, PreparedStatement>> removePSMap = new HashMap<Class<?>, Map<String, PreparedStatement>>(
                Maps.transformValues(entityMetaMap, removePSTransformer));

        Cache<StatementCacheKey, PreparedStatement> dynamicPSCache = CacheBuilder.newBuilder()
                .maximumSize(PREPARED_STATEMENT_LRU_CACHE_SIZE).build();

        Map<CQLQueryType, PreparedStatement> counterQueryMap;
        if (hasSimpleCounter) {
            counterQueryMap = queryGenerator.prepareSimpleCounterQueryMap(session);
        } else {
            counterQueryMap = new HashMap<CQLQueryType, PreparedStatement>();
        }

        Map<Class<?>, Map<CQLQueryType, PreparedStatement>> clusteredCounterQueriesMap = new HashMap<Class<?>, Map<CQLQueryType, PreparedStatement>>(
                Maps.transformValues(Maps.filterValues(entityMetaMap, clusteredCounterFilter),
                        clusteredCounterTransformer));

        return new CQLDaoContext(insertPSMap, dynamicPSCache, selectEagerPSMap, removePSMap, counterQueryMap,
                clusteredCounterQueriesMap, session);
    }
}