org.jsmpp.util.Sequence Maven / Gradle / Ivy
/*
* 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 org.jsmpp.util;
/**
* Sequence number that able to rolling.
*
* @author uudashr
* @version 1.0
* @since 2.0
*
*/
public class Sequence {
private int value;
/**
* @param start is the start/init value of the sequence.
*/
public Sequence(int start) {
value = start;
}
/**
* Return the next value.
*
* @return the next value.
*/
public synchronized int nextValue() {
int curValue = value++;
if (curValue == Integer.MAX_VALUE) {
value = 1;
}
return curValue;
}
/**
* @return the current value.
*/
public synchronized int currentValue() {
return value;
}
}
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