StartSearch.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.mq.cassandra.io;


import java.util.UUID;

import org.apache.usergrid.mq.QueueQuery;

import me.prettyprint.hector.api.Keyspace;


/**
 * Reads from the queue without starting transactions.
 *
 * @author tnine
 */
public class StartSearch extends NoTransactionSearch
{
    public StartSearch( Keyspace ko )
    {
        super( ko );
    }


    /*
     * (non-Javadoc)
     *
     * @see org.apache.usergrid.mq.cassandra.io.NoTransaction#getParams(java.util.UUID,
     * java.util.UUID, org.apache.usergrid.mq.QueueQuery)
     */
    @Override
    protected SearchParam getParams( UUID queueId, UUID consumerId, QueueQuery query )
    {
        UUID lastMessageId = query.getLastMessageId();
        return new SearchParam( lastMessageId, false, lastMessageId != null, query.getLimit( DEFAULT_READ ) );
    }


    /* (non-Javadoc)
     * @see org.apache.usergrid.mq.cassandra.io.FifoSearch#writeClientPointer(java.util.UUID, java.util.UUID, java.util.UUID)
     */
    @Override
    protected void writeClientPointer( UUID queueId, UUID consumerId, UUID lastReturnedId )
    {
        //no op for searches from the start
    }
}