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WL#12246, DevAPI: Prepared statement support.
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src/main/core-api/java/com/mysql/cj/util/SequentialIdLease.java
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/* | ||
* 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 | ||
*/ | ||
|
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package com.mysql.cj.util; | ||
|
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import java.util.Iterator; | ||
import java.util.Set; | ||
import java.util.TreeSet; | ||
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public class SequentialIdLease { | ||
private Set<Integer> sequentialIdsLease = new TreeSet<>(); | ||
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/** | ||
* 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; | ||
} | ||
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/** | ||
* 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); | ||
} | ||
} |
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