/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-09 Wolfgang M. Meier
* wolfgang@exist-db.org
* http://exist.sourceforge.net
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id:
*/
package org.exist.xquery.functions.system;
import org.apache.log4j.Logger;
import org.exist.dom.QName;
import org.exist.storage.BrokerPool;
import org.exist.xquery.BasicFunction;
import org.exist.xquery.Cardinality;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.FunctionParameterSequenceType;
import org.exist.xquery.value.IntegerValue;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.Type;
/**
* Return details about eXist instances
*
* @author Adam Retter (adam.retter@devon.gov.uk)
*/
public class CountInstances extends BasicFunction
{
protected final static Logger logger = Logger.getLogger(CountInstances.class);
public final static FunctionSignature countInstancesMax =
new FunctionSignature(
new QName("count-instances-max", SystemModule.NAMESPACE_URI, SystemModule.PREFIX),
"Returns the maximum number of eXist instances.",
FunctionSignature.NO_ARGS,
new FunctionParameterSequenceType("result", Type.INTEGER, Cardinality.EXACTLY_ONE, "the count")
);
public final static FunctionSignature countInstancesActive =
new FunctionSignature(
new QName("count-instances-active", SystemModule.NAMESPACE_URI, SystemModule.PREFIX),
"Returns the number of eXist instances that are active.",
FunctionSignature.NO_ARGS,
new FunctionParameterSequenceType("result", Type.INTEGER, Cardinality.EXACTLY_ONE, "the count")
);
public final static FunctionSignature countInstancesAvailable =
new FunctionSignature(
new QName("count-instances-available", SystemModule.NAMESPACE_URI, SystemModule.PREFIX),
"Returns the number of eXist instances that are available.",
FunctionSignature.NO_ARGS,
new FunctionParameterSequenceType("result", Type.INTEGER, Cardinality.EXACTLY_ONE, "the count")
);
private BrokerPool bp = null;
public CountInstances(XQueryContext context, FunctionSignature signature)
{
super(context, signature);
bp = context.getBroker().getBrokerPool();
}
/* (non-Javadoc)
* @see org.exist.xquery.BasicFunction#eval(org.exist.xquery.value.Sequence[], org.exist.xquery.value.Sequence)
*/
public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException
{
int count = 0;
if(isCalledAs("count-instances-max"))
{
count = bp.getMax();
}
else if(isCalledAs("count-instances-active"))
{
count = bp.countActiveBrokers();
}
else if(isCalledAs("count-instances-available"))
{
count = bp.available();
}
return new IntegerValue(count, Type.INTEGER);
}
}