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Thrift implementation for Achilles using Hector library
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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.entity.operations.impl;

import static info.archinnov.achilles.logger.ThriftLoggerHelper.*;
import static me.prettyprint.hector.api.beans.AbstractComposite.ComponentEquality.*;
import info.archinnov.achilles.composite.ThriftCompositeFactory;
import info.archinnov.achilles.context.ThriftPersistenceContext;
import info.archinnov.achilles.dao.ThriftGenericWideRowDao;
import info.archinnov.achilles.entity.metadata.EntityMeta;
import info.archinnov.achilles.entity.metadata.PropertyMeta;
import info.archinnov.achilles.type.CounterBuilder.CounterImpl;
import info.archinnov.achilles.validation.Validator;

import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import me.prettyprint.hector.api.beans.AbstractComposite.ComponentEquality;
import me.prettyprint.hector.api.beans.Composite;
import me.prettyprint.hector.api.mutation.Mutator;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.FluentIterable;

public class ThriftPersisterImpl {
	private static final Logger log = LoggerFactory.getLogger(ThriftPersisterImpl.class);
	private static final String EMPTY = "";

	private ThriftCompositeFactory compositeFactory = new ThriftCompositeFactory();

	public void batchPersistSimpleProperty(ThriftPersistenceContext context, PropertyMeta propertyMeta) {
		Composite name = compositeFactory.createForBatchInsertSingleValue(propertyMeta);
		String value = propertyMeta.forceEncodeToJSON(propertyMeta.getValueFromField(context.getEntity()));
		if (value != null) {
			if (log.isTraceEnabled()) {
				log.trace(
						"Batch persisting simple property {} from entity of class {} and primary key {} with column name {}",
						propertyMeta.getPropertyName(), context.getEntityClass().getCanonicalName(),
						context.getPrimaryKey(), format(name));
			}
			Object rowKey = buildRowKey(context);
			context.getEntityDao().insertColumnBatch(rowKey, name, value, context.getTtt(), context.getTimestamp(),
					context.getEntityMutator(context.getTableName()));
		}
	}

	public void persistCounter(ThriftPersistenceContext context, PropertyMeta propertyMeta) {

		Object counter = propertyMeta.getValueFromField(context.getEntity());
		String entityClassName = context.getEntityClass().getCanonicalName();
		if (counter != null) {

			PropertyMeta idMeta = context.getEntityMeta().getIdMeta();
			Object primaryKey = context.getPrimaryKey();
			Composite rowKey = compositeFactory.createRowKeyForCounter(propertyMeta.fqcn(), primaryKey, idMeta);
			Composite name = compositeFactory.createBaseForCounterGet(propertyMeta);
			if (log.isTraceEnabled()) {
				log.trace(
						"Batch persisting counter property {} from entity of class {} and primary key {} with column name {}",
						propertyMeta.getPropertyName(), entityClassName, context.getPrimaryKey(), format(name));
			}

			Validator.validateTrue(CounterImpl.class.isAssignableFrom(counter.getClass()),
					"Counter clustered entity '%s' value should be of type '%s'", entityClassName,
					CounterImpl.class.getCanonicalName());

			CounterImpl counterValue = (CounterImpl) counter;
			context.getCounterDao().incrementCounter(rowKey, name, counterValue.get());
		}
	}

	public  void batchPersistList(List list, ThriftPersistenceContext context, PropertyMeta propertyMeta) {
		int count = 0;
		for (V value : list) {
			String stringValue = propertyMeta.forceEncodeToJSON(value);
			if (stringValue != null) {
				Composite name = compositeFactory.createForBatchInsertList(propertyMeta, count);
				if (log.isTraceEnabled()) {
					log.trace(
							"Batch persisting list property {} from entity of class {} and primary key {} with column name {}",
							propertyMeta.getPropertyName(), context.getEntityClass().getCanonicalName(),
							context.getPrimaryKey(), format(name));
				}
				Object rowKey = buildRowKey(context);
				context.getEntityDao().insertColumnBatch(rowKey, name, stringValue, context.getTtt(),
						context.getTimestamp(), context.getEntityMutator(context.getTableName()));
			}
			count++;
		}
	}

	public  void batchPersistSet(Set set, ThriftPersistenceContext context, PropertyMeta propertyMeta) {
		for (V value : set) {

			String valueAsString = propertyMeta.forceEncodeToJSON(value);
			if (valueAsString != null) {
				Composite name = compositeFactory.createForBatchInsertSetOrMap(propertyMeta, valueAsString);
				if (log.isTraceEnabled()) {
					log.trace(
							"Batch persisting set property {} from entity of class {} and primary key {} with column name {}",
							propertyMeta.getPropertyName(), context.getEntityClass().getCanonicalName(),
							context.getPrimaryKey(), format(name));
				}
				Object rowKey = buildRowKey(context);
				context.getEntityDao().insertColumnBatch(rowKey, name, EMPTY, context.getTtt(), context.getTimestamp(),
						context.getEntityMutator(context.getTableName()));
			}
		}
	}

	public void batchPersistMap(Map map, ThriftPersistenceContext context, PropertyMeta propertyMeta) {
		for (Entry entry : map.entrySet()) {

			String keyAsString = propertyMeta.forceEncodeToJSON(entry.getKey());
			String valueAsString = propertyMeta.forceEncodeToJSON(entry.getValue());

			Composite name = compositeFactory.createForBatchInsertSetOrMap(propertyMeta, keyAsString);

			if (log.isTraceEnabled()) {
				log.trace(
						"Batch persisting map property {} from entity of class {} and primary key {} with column name {}",
						propertyMeta.getPropertyName(), context.getEntityClass().getCanonicalName(),
						context.getPrimaryKey(), format(name));
			}
			Object rowKey = buildRowKey(context);
			context.getEntityDao().insertColumnBatch(rowKey, name, valueAsString, context.getTtt(),
					context.getTimestamp(), context.getEntityMutator(context.getTableName()));
		}
	}

	public void persistClusteredEntity(ThriftPersistenceContext context, Object clusteredValue) {
		Object rowKey = buildRowKey(context);

		String tableName = context.getTableName();
		String className = context.getEntityClass().getCanonicalName();

		Composite comp = compositeFactory.createCompositeForClusteringComponents(context);

		ThriftGenericWideRowDao dao = context.findWideRowDao(tableName);
		Mutator