io.nosqlbench.engine.api.activityimpl.input.InputInterval Maven / Gradle / Ivy
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The engine API for nosqlbench;
Provides the interfaces needed to build internal modules for the
nosqlbench core engine
/*
*
* 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;
}
}
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