/*_############################################################################
_##
_## SNMP4J-Agent - LogMOTableSizeLimit.java
_##
_## Copyright (C) 2005-2009 Frank Fock (SNMP4J.org)
_##
_## 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.snmp4j.agent.mo.util;
import org.snmp4j.agent.mo.MOTableRowEvent;
import org.snmp4j.agent.mo.MOTable;
import java.util.Iterator;
import java.util.Properties;
/**
* The <code>LogMOTableSizeLimit</code> implements a {@link MOTableSizeLimit}
* to limit the number of entries in a table by removing the eldest rows
* existing in the table when the limit is exceeded.
*
* @author Frank Fock
* @version 1.1.5
* @since 1.1.5
*/
public class LogMOTableSizeLimit extends MOTableSizeLimit {
public LogMOTableSizeLimit(int maxNumRows) {
super(maxNumRows);
}
public LogMOTableSizeLimit(Properties limits) {
super(limits);
}
/**
* Removes the given number of rows starting at the lowest index value.
*
* @param triggeringEvent the MOTableRowEvent object that describes the
* table with exceeding row limit.
* @param numRows
* the number of rows to remove (if possible).
* @return <code>true</code> if one or more rows could be removed and
* <code>false</code> if the causing event should be denied/rejected. The
* default implementation returns <code>false</code> always.
*/
protected boolean removeEldest(MOTableRowEvent triggeringEvent, int numRows) {
MOTable table = triggeringEvent.getTable();
boolean removed = false;
synchronized (table.getModel()) {
Iterator it = table.getModel().iterator();
for (int i = 0; (i < numRows) && it.hasNext(); i++) {
it.next();
it.remove();
removed = true;
}
}
return removed;
}
}