/**
 * 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.stress.operations;

import java.io.IOException;
import java.nio.ByteBuffer;

import org.apache.cassandra.stress.Operation;
import org.apache.cassandra.stress.settings.SettingsCommandMulti;
import org.apache.cassandra.stress.util.ThriftClient;
import org.apache.cassandra.thrift.ColumnParent;
import org.apache.cassandra.thrift.KeyRange;
import org.apache.cassandra.thrift.SlicePredicate;
import org.apache.cassandra.thrift.SliceRange;
import org.apache.cassandra.utils.ByteBufferUtil;

public final class ThriftRangeSlicer extends Operation
{

    public ThriftRangeSlicer(State state, long index)
    {
        super(state, index);
    }

    @Override
    public void run(final ThriftClient client) throws IOException
    {
        final SlicePredicate predicate = new SlicePredicate()
                .setSlice_range(
                        new SliceRange(
                                ByteBufferUtil.EMPTY_BYTE_BUFFER,
                                ByteBufferUtil.EMPTY_BYTE_BUFFER,
                                false,
                                state.settings.columns.maxColumnsPerKey
                        )
                );

        final ByteBuffer start = getKey();
        final KeyRange range =
                new KeyRange(state.settings.columns.maxColumnsPerKey)
                        .setStart_key(start)
                        .setEnd_key(ByteBufferUtil.EMPTY_BYTE_BUFFER)
                        .setCount(((SettingsCommandMulti)state.settings.command).keysAtOnce);

        for (final ColumnParent parent : state.columnParents)
        {
            timeWithRetry(new RunOp()
            {
                private int count = 0;
                @Override
                public boolean run() throws Exception
                {
                    return (count = client.get_range_slices(parent, predicate, range, state.settings.command.consistencyLevel).size()) != 0;
                }

                @Override
                public String key()
                {
                    return new String(range.bufferForStart_key().array());
                }

                @Override
                public int keyCount()
                {
                    return count;
                }
            });
        }
    }

}