com.mysql.cj.util.SequentialIdLease Maven / Gradle / Ivy
/*
* Copyright (c) 2019, 2020, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
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* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
* http://oss.oracle.com/licenses/universal-foss-exception.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
* for more details.
*
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*/
package com.mysql.cj.util;
import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;
public class SequentialIdLease {
private Set sequentialIdsLease = new TreeSet<>();
/**
* Finds and allocates the first available sequential id.
*
* @return the next free sequential id.
*/
public int allocateSequentialId() {
int nextSequentialId = 0;
for (Iterator it = this.sequentialIdsLease.iterator(); it.hasNext() && nextSequentialId + 1 == it.next(); nextSequentialId++) {
// Find the first free sequential id.
}
this.sequentialIdsLease.add(++nextSequentialId);
return nextSequentialId;
}
/**
* Frees the given sequential id so that it can be reused.
*
* @param sequentialId
* the sequential id to release
*/
public void releaseSequentialId(int sequentialId) {
this.sequentialIdsLease.remove(sequentialId);
}
}