/*
* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
*
* 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
* authors of MySQL hereby grant you an additional permission to link the
* 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
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.cj.util;
import java.util.
Iterator;
import java.util.
Set;
import java.util.
TreeSet;
public class
SequentialIdLease {
private
Set<
Integer>
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<
Integer>
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);
}
}