org.grails.datastore.mapping.cassandra.util.HectorTemplate.java Source code

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Here is the source code for org.grails.datastore.mapping.cassandra.util.HectorTemplate.java

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/* Copyright (C) 2010 SpringSource
 *
 * 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 org.grails.datastore.mapping.cassandra.util;

import me.prettyprint.cassandra.model.HectorException;
import me.prettyprint.cassandra.service.CassandraClient;
import me.prettyprint.cassandra.service.Keyspace;

import org.springframework.dao.DataAccessException;
import org.springframework.dao.DataAccessResourceFailureException;

/**
 * A Spring style template that wraps Cassandra data access exceptions and
 * rethrows to Spring's standard exception hierarchy
 *
 * @author Graeme Rocher
 * @since 1.0
 */
public class HectorTemplate {

    CassandraClient cassandraClient;

    public HectorTemplate(CassandraClient cassandraClient) {
        this.cassandraClient = cassandraClient;
    }

    public Object execute(String keyspace, HectorCallback callable) throws DataAccessException {
        final Keyspace ks;
        try {
            ks = cassandraClient.getKeyspace(keyspace);
        } catch (HectorException e) {
            throw new DataAccessResourceFailureException("Exception occurred invoking Cassandra: " + e.getMessage(),
                    e);
        }

        try {
            return callable.doInHector(ks);
        } catch (HectorException e) {
            throw new DataAccessResourceFailureException("Exception occurred invoking Cassandra: " + e.getMessage(),
                    e);
        }
    }
}