examples/triggers/src/org/apache/cassandra/triggers/AuditTrigger.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.cassandra.triggers;

import java.io.InputStream;
import java.util.Collection;
import java.util.Collections;
import java.util.Properties;

import org.apache.cassandra.config.Schema;
import org.apache.cassandra.db.Mutation;
import org.apache.cassandra.db.RowUpdateBuilder;
import org.apache.cassandra.db.partitions.Partition;
import org.apache.cassandra.io.util.FileUtils;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.UUIDGen;

public class AuditTrigger implements ITrigger
{
    private Properties properties = loadProperties();

    public Collection<Mutation> augment(Partition update)
    {
        String auditKeyspace = properties.getProperty("keyspace");
        String auditTable = properties.getProperty("table");

        RowUpdateBuilder audit = new RowUpdateBuilder(Schema.instance.getCFMetaData(auditKeyspace, auditTable),
                                                      FBUtilities.timestampMicros(),
                                                      UUIDGen.getTimeUUID());

        audit.add("keyspace_name", update.metadata().ksName);
        audit.add("table_name", update.metadata().cfName);
        audit.add("primary_key", update.metadata().getKeyValidator().getString(update.partitionKey().getKey()));

        return Collections.singletonList(audit.build());
    }

    private static Properties loadProperties()
    {
        Properties properties = new Properties();
        InputStream stream = AuditTrigger.class.getClassLoader().getResourceAsStream("AuditTrigger.properties");
        try
        {
            properties.load(stream);
        }
        catch (Exception e)
        {
            throw new RuntimeException(e);
        }
        finally
        {
            FileUtils.closeQuietly(stream);
        }
        return properties;
    }
}