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<?php
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*
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* @package thrift.transport
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*/
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/**
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* Buffered transport. Stores data to an internal buffer that it doesn't
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* actually write out until flush is called. For reading, we do a greedy
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* read and then serve data out of the internal buffer.
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*
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* @package thrift.transport
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*/
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class TBufferedTransport extends TTransport {
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/**
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* Constructor. Creates a buffered transport around an underlying transport
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*/
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public function __construct($transport=null, $rBufSize=512, $wBufSize=512) {
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$this->transport_ = $transport;
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$this->rBufSize_ = $rBufSize;
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$this->wBufSize_ = $wBufSize;
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}
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/**
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* The underlying transport
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*
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* @var TTransport
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*/
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protected $transport_ = null;
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/**
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* The receive buffer size
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*
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* @var int
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*/
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protected $rBufSize_ = 512;
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/**
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* The write buffer size
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*
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* @var int
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*/
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protected $wBufSize_ = 512;
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/**
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* The write buffer.
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*
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* @var string
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*/
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protected $wBuf_ = '';
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/**
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* The read buffer.
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*
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* @var string
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*/
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protected $rBuf_ = '';
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public function isOpen() {
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return $this->transport_->isOpen();
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}
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public function open() {
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$this->transport_->open();
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}
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public function close() {
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$this->transport_->close();
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}
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public function putBack($data) {
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if (strlen($this->rBuf_) === 0) {
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$this->rBuf_ = $data;
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} else {
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$this->rBuf_ = ($data . $this->rBuf_);
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}
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}
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/**
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* The reason that we customize readAll here is that the majority of PHP
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* streams are already internally buffered by PHP. The socket stream, for
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* example, buffers internally and blocks if you call read with $len greater
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* than the amount of data available, unlike recv() in C.
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*
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* Therefore, use the readAll method of the wrapped transport inside
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* the buffered readAll.
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*/
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public function readAll($len) {
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$have = strlen($this->rBuf_);
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if ($have == 0) {
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$data = $this->transport_->readAll($len);
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} else if ($have < $len) {
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$data = $this->rBuf_;
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$this->rBuf_ = '';
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$data .= $this->transport_->readAll($len - $have);
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} else if ($have == $len) {
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$data = $this->rBuf_;
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$this->rBuf_ = '';
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} else if ($have > $len) {
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$data = substr($this->rBuf_, 0, $len);
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$this->rBuf_ = substr($this->rBuf_, $len);
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}
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return $data;
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}
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public function read($len) {
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if (strlen($this->rBuf_) === 0) {
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$this->rBuf_ = $this->transport_->read($this->rBufSize_);
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}
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if (strlen($this->rBuf_) <= $len) {
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$ret = $this->rBuf_;
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$this->rBuf_ = '';
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return $ret;
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}
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$ret = substr($this->rBuf_, 0, $len);
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$this->rBuf_ = substr($this->rBuf_, $len);
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return $ret;
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}
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public function write($buf) {
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$this->wBuf_ .= $buf;
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if (strlen($this->wBuf_) >= $this->wBufSize_) {
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$out = $this->wBuf_;
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// Note that we clear the internal wBuf_ prior to the underlying write
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// to ensure we're in a sane state (i.e. internal buffer cleaned)
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// if the underlying write throws up an exception
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$this->wBuf_ = '';
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$this->transport_->write($out);
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}
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}
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public function flush() {
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if (strlen($this->wBuf_) > 0) {
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$this->transport_->write($this->wBuf_);
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$this->wBuf_ = '';
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}
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$this->transport_->flush();
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}
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}
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