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<?php
/*
* 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.
*
* @package thrift.transport
*/
namespace Thrift\Transport;
use Thrift\Exception\TTransportException;
use Thrift\Factory\TStringFuncFactory;
/**
* Buffered transport. Stores data to an internal buffer that it doesn't
* actually write out until flush is called. For reading, we do a greedy
* read and then serve data out of the internal buffer.
*
* @package thrift.transport
*/
class TBufferedTransport extends TTransport
{
/**
* The underlying transport
*
* @var TTransport
*/
protected $transport_;
/**
* The receive buffer size
*
* @var int
*/
protected $rBufSize_ = 512;
/**
* The write buffer size
*
* @var int
*/
protected $wBufSize_ = 512;
/**
* The write buffer.
*
* @var string
*/
protected $wBuf_ = '';
/**
* The read buffer.
*
* @var string
*/
protected $rBuf_ = '';
/**
* Constructor. Creates a buffered transport around an underlying transport
*/
public function __construct($transport, $rBufSize = 512, $wBufSize = 512)
{
$this->transport_ = $transport;
$this->rBufSize_ = $rBufSize;
$this->wBufSize_ = $wBufSize;
}
public function isOpen()
{
return $this->transport_->isOpen();
}
/**
* @inheritdoc
*
* @throws TTransportException
*/
public function open()
{
$this->transport_->open();
}
public function close()
{
$this->transport_->close();
}
public function putBack($data)
{
if (TStringFuncFactory::create()->strlen($this->rBuf_) === 0) {
$this->rBuf_ = $data;
} else {
$this->rBuf_ = ($data . $this->rBuf_);
}
}
/**
* The reason that we customize readAll here is that the majority of PHP
* streams are already internally buffered by PHP. The socket stream, for
* example, buffers internally and blocks if you call read with $len greater
* than the amount of data available, unlike recv() in C.
*
* Therefore, use the readAll method of the wrapped transport inside
* the buffered readAll.
*
* @throws TTransportException
*/
public function readAll($len)
{
$have = TStringFuncFactory::create()->strlen($this->rBuf_);
if ($have == 0) {
$data = $this->transport_->readAll($len);
} elseif ($have < $len) {
$data = $this->rBuf_;
$this->rBuf_ = '';
$data .= $this->transport_->readAll($len - $have);
} elseif ($have == $len) {
$data = $this->rBuf_;
$this->rBuf_ = '';
} elseif ($have > $len) {
$data = TStringFuncFactory::create()->substr($this->rBuf_, 0, $len);
$this->rBuf_ = TStringFuncFactory::create()->substr($this->rBuf_, $len);
}
return $data;
}
/**
* @inheritdoc
*
* @param int $len
* @return string
* @throws TTransportException
*/
public function read($len)
{
if (TStringFuncFactory::create()->strlen($this->rBuf_) === 0) {
$this->rBuf_ = $this->transport_->read($this->rBufSize_);
}
if (TStringFuncFactory::create()->strlen($this->rBuf_) <= $len) {
$ret = $this->rBuf_;
$this->rBuf_ = '';
return $ret;
}
$ret = TStringFuncFactory::create()->substr($this->rBuf_, 0, $len);
$this->rBuf_ = TStringFuncFactory::create()->substr($this->rBuf_, $len);
return $ret;
}
/**
* @inheritdoc
*
* @param string $buf
* @throws TTransportException
*/
public function write($buf)
{
$this->wBuf_ .= $buf;
if (TStringFuncFactory::create()->strlen($this->wBuf_) >= $this->wBufSize_) {
$out = $this->wBuf_;
// Note that we clear the internal wBuf_ prior to the underlying write
// to ensure we're in a sane state (i.e. internal buffer cleaned)
// if the underlying write throws up an exception
$this->wBuf_ = '';
$this->transport_->write($out);
}
}
/**
* @inheritdoc
*
* @throws TTransportException
*/
public function flush()
{
if (TStringFuncFactory::create()->strlen($this->wBuf_) > 0) {
$out = $this->wBuf_;
// Note that we clear the internal wBuf_ prior to the underlying write
// to ensure we're in a sane state (i.e. internal buffer cleaned)
// if the underlying write throws up an exception
$this->wBuf_ = '';
$this->transport_->write($out);
}
$this->transport_->flush();
}
}
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