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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
#include <log4cxx/logstring.h>
#include <log4cxx/helpers/cyclicbuffer.h>
#include <log4cxx/spi/loggingevent.h>
#include <log4cxx/helpers/exception.h>
#include <log4cxx/helpers/pool.h>
#include <log4cxx/helpers/stringhelper.h>
using namespace log4cxx;
using namespace log4cxx::helpers;
using namespace log4cxx::spi;
/**
Instantiate a new CyclicBuffer of at most <code>maxSize</code> events.
The <code>maxSize</code> argument must a positive integer.
@param maxSize The maximum number of elements in the buffer.
*/
CyclicBuffer::CyclicBuffer(int maxSize1)
: ea(maxSize1), first(0), last(0), numElems(0), maxSize(maxSize1)
{
if(maxSize1 < 1)
{
LogString msg(LOG4CXX_STR("The maxSize argument ("));
Pool p;
StringHelper::toString(maxSize1, p, msg);
msg.append(LOG4CXX_STR(") is not a positive integer."));
throw IllegalArgumentException(msg);
}
}
CyclicBuffer::~CyclicBuffer()
{
}
/**
Add an <code>event</code> as the last event in the buffer.
*/
void CyclicBuffer::add(const spi::LoggingEventPtr& event)
{
ea[last] = event;
if(++last == maxSize)
{
last = 0;
}
if(numElems < maxSize)
{
numElems++;
}
else if(++first == maxSize)
{
first = 0;
}
}
/**
Get the <i>i</i>th oldest event currently in the buffer. If
<em>i</em> is outside the range 0 to the number of elements
currently in the buffer, then <code>null</code> is returned.
*/
spi::LoggingEventPtr CyclicBuffer::get(int i)
{
if(i < 0 || i >= numElems)
return 0;
return ea[(first + i) % maxSize];
}
/**
Get the oldest (first) element in the buffer. The oldest element
is removed from the buffer.
*/
spi::LoggingEventPtr CyclicBuffer::get()
{
LoggingEventPtr r;
if(numElems > 0)
{
numElems--;
r = ea[first];
ea[first] = 0;
if(++first == maxSize)
{
first = 0;
}
}
return r;
}
/**
Resize the cyclic buffer to <code>newSize</code>.
@throws IllegalArgumentException if <code>newSize</code> is negative.
*/
void CyclicBuffer::resize(int newSize)
{
if(newSize < 0)
{
LogString msg(LOG4CXX_STR("Negative array size ["));
Pool p;
StringHelper::toString(newSize, p, msg);
msg.append(LOG4CXX_STR("] not allowed."));
throw IllegalArgumentException(msg);
}
if(newSize == numElems)
return; // nothing to do
LoggingEventList temp(newSize);
int loopLen = newSize < numElems ? newSize : numElems;
int i;
for(i = 0; i < loopLen; i++)
{
temp[i] = ea[first];
ea[first] = 0;
if(++first == numElems)
first = 0;
}
ea = temp;
first = 0;
numElems = loopLen;
maxSize = newSize;
if (loopLen == newSize)
{
last = 0;
}
else
{
last = loopLen;
}
}
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