org.apache.hadoop.hbase.regionserver.compactions.GaussianFileListGenerator.java Source code

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Here is the source code for org.apache.hadoop.hbase.regionserver.compactions.GaussianFileListGenerator.java

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/**
 * 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.hadoop.hbase.regionserver.compactions;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.math.random.GaussianRandomGenerator;
import org.apache.commons.math.random.MersenneTwister;
import org.apache.hadoop.hbase.regionserver.StoreFile;

class GaussianFileListGenerator extends StoreFileListGenerator {

    GaussianFileListGenerator() {
        super(GaussianFileListGenerator.class);
    }

    @Override
    public Iterator<List<StoreFile>> iterator() {
        return new Iterator<List<StoreFile>>() {
            private GaussianRandomGenerator gen = new GaussianRandomGenerator(
                    new MersenneTwister(random.nextInt()));
            private int count = 0;

            @Override
            public boolean hasNext() {
                return count < MAX_FILE_GEN_ITERS;
            }

            @Override
            public List<StoreFile> next() {
                count += 1;
                ArrayList<StoreFile> files = new ArrayList<StoreFile>(NUM_FILES_GEN);
                for (int i = 0; i < NUM_FILES_GEN; i++) {
                    files.add(createMockStoreFile(
                            (int) Math.ceil(Math.max(0, gen.nextNormalizedDouble() * 32 + 32))));
                }

                return files;
            }

            @Override
            public void remove() {
            }
        };
    }
}