/tags/release-0.1-rc2/hive/external/service/lib/php/transport/TBufferedTransport.php
PHP | 163 lines | 75 code | 21 blank | 67 comment | 15 complexity | 4345341b79670b84054af5c9ad7ead4a MD5 | raw file
Possible License(s): Apache-2.0, BSD-3-Clause, JSON, CPL-1.0
- <?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
- */
- /**
- * 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 {
- /**
- * Constructor. Creates a buffered transport around an underlying transport
- */
- public function __construct($transport=null, $rBufSize=512, $wBufSize=512) {
- $this->transport_ = $transport;
- $this->rBufSize_ = $rBufSize;
- $this->wBufSize_ = $wBufSize;
- }
- /**
- * The underlying transport
- *
- * @var TTransport
- */
- protected $transport_ = null;
- /**
- * 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_ = '';
- public function isOpen() {
- return $this->transport_->isOpen();
- }
- public function open() {
- $this->transport_->open();
- }
- public function close() {
- $this->transport_->close();
- }
- public function putBack($data) {
- if (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 $len greater
- * than the amount of data available, unlike recv() in C.
- *
- * Therefore, use the readAll method of the wrapped transport inside
- * the buffered readAll.
- */
- public function readAll($len) {
- $have = strlen($this->rBuf_);
- if ($have == 0) {
- $data = $this->transport_->readAll($len);
- } else if ($have < $len) {
- $data = $this->rBuf_;
- $this->rBuf_ = '';
- $data .= $this->transport_->readAll($len - $have);
- } else if ($have == $len) {
- $data = $this->rBuf_;
- $this->rBuf_ = '';
- } else if ($have > $len) {
- $data = substr($this->rBuf_, 0, $len);
- $this->rBuf_ = substr($this->rBuf_, $len);
- }
- return $data;
- }
- public function read($len) {
- if (strlen($this->rBuf_) === 0) {
- $this->rBuf_ = $this->transport_->read($this->rBufSize_);
- }
- if (strlen($this->rBuf_) <= $len) {
- $ret = $this->rBuf_;
- $this->rBuf_ = '';
- return $ret;
- }
- $ret = substr($this->rBuf_, 0, $len);
- $this->rBuf_ = substr($this->rBuf_, $len);
- return $ret;
- }
- public function write($buf) {
- $this->wBuf_ .= $buf;
- if (strlen($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);
- }
- }
- public function flush() {
- if (strlen($this->wBuf_) > 0) {
- $this->transport_->write($this->wBuf_);
- $this->wBuf_ = '';
- }
- $this->transport_->flush();
- }
- }
- ?>