All Downloads are FREE. Search and download functionalities are using the official Maven repository.

io.nosqlbench.engine.api.activityimpl.input.InputInterval Maven / Gradle / Ivy

Go to download

The engine API for nosqlbench; Provides the interfaces needed to build internal modules for the nosqlbench core engine

There is a newer version: 5.17.0
Show newest version
/*
 *
 *    Copyright 2016 jshook
 *    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 io.nosqlbench.engine.api.activityimpl.input;

import io.nosqlbench.engine.api.activityapi.cyclelog.buffers.results.CycleSegment;
import io.nosqlbench.engine.api.activityapi.input.Input;

import java.util.concurrent.atomic.AtomicLong;

public class InputInterval implements Input {

    private final long min;
    private final long nextMin;
    private AtomicLong next;

    public InputInterval(long min, long nextMin) {
        this.min = min;
        this.nextMin = nextMin;
        this.next = new AtomicLong(min);
    }

    @Override
    public CycleSegment getInputSegment(int segmentLength) {
        while (true) {
            int current = next.intValue();
            int nextCurrent = current + segmentLength;
            if (nextCurrent > nextMin) {
                return null;
            }
            if (next.compareAndSet(current,nextCurrent)) {
                return new Segment(current,nextCurrent);
            }
            // in all other cases, there was a CAS race condition, and we want to retry
        }
    }

    public String toString() {
        return "InputInterval[" + min + "," + nextMin + "), next=" + next.intValue();
    }

    public static class Segment implements CycleSegment {

        private final long afterEnd;
        private final long start;
        private long next;

        public Segment(long start, long afterEnd) {
            this.start = start;
            this.afterEnd = afterEnd;
            this.next = start;
        }

        @Override
        public long nextCycle() {
            if (next < afterEnd) {
                return next++;
            }
            return -100;
        }

        @Override
        public long peekNextCycle() {
            if (next < afterEnd) {
                return next;
            }
            return -100;
        }


        @Override
        public boolean isExhausted() {
            return next >= afterEnd;
        }


        public String toString() {
            return "InputInterval.Segment(" + start + "," + afterEnd + "]: next=" + next;
        }
    }

    @Override
    public boolean isContiguous() {
        return true;
    }
}




© 2015 - 2024 Weber Informatics LLC | Privacy Policy