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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.processor
*/
namespace Thrift;
use Thrift\Exception\TException;
use Thrift\Protocol\TProtocol;
use Thrift\Protocol\TMultiplexedProtocol;
use Thrift\Type\TMessageType;
/**
* <code>TMultiplexedProcessor</code> is a Processor allowing
* a single <code>TServer</code> to provide multiple services.
*
* <p>To do so, you instantiate the processor and then register additional
* processors with it, as shown in the following example:</p>
*
* <blockquote><code>
* $processor = new TMultiplexedProcessor();
*
* processor->registerProcessor(
* "Calculator",
* new \tutorial\CalculatorProcessor(new CalculatorHandler()));
*
* processor->registerProcessor(
* "WeatherReport",
* new \tutorial\WeatherReportProcessor(new WeatherReportHandler()));
*
* $processor->process($protocol, $protocol);
* </code></blockquote>
*/
class TMultiplexedProcessor
{
private $serviceProcessorMap_;
/**
* 'Register' a service with this <code>TMultiplexedProcessor</code>. This
* allows us to broker requests to individual services by using the service
* name to select them at request time.
*
* @param serviceName Name of a service, has to be identical to the name
* declared in the Thrift IDL, e.g. "WeatherReport".
* @param processor Implementation of a service, usually referred to
* as "handlers", e.g. WeatherReportHandler implementing WeatherReport.Iface.
*/
public function registerProcessor($serviceName, $processor)
{
$this->serviceProcessorMap_[$serviceName] = $processor;
}
/**
* This implementation of <code>process</code> performs the following steps:
*
* <ol>
* <li>Read the beginning of the message.</li>
* <li>Extract the service name from the message.</li>
* <li>Using the service name to locate the appropriate processor.</li>
* <li>Dispatch to the processor, with a decorated instance of TProtocol
* that allows readMessageBegin() to return the original Message.</li>
* </ol>
*
* @throws TException If the message type is not CALL or ONEWAY, if
* the service name was not found in the message, or if the service
* name was not found in the service map.
*/
public function process(TProtocol $input, TProtocol $output)
{
/*
Use the actual underlying protocol (e.g. TBinaryProtocol) to read the
message header. This pulls the message "off the wire", which we'll
deal with at the end of this method.
*/
$input->readMessageBegin($fname, $mtype, $rseqid);
if ($mtype !== TMessageType::CALL && $mtype != TMessageType::ONEWAY) {
throw new TException("This should not have happened!?");
}
// Extract the service name and the new Message name.
if (strpos($fname, TMultiplexedProtocol::SEPARATOR) === false) {
throw new TException("Service name not found in message name: {$fname}. Did you " .
"forget to use a TMultiplexProtocol in your client?");
}
list($serviceName, $messageName) = explode(':', $fname, 2);
if (!array_key_exists($serviceName, $this->serviceProcessorMap_)) {
throw new TException("Service name not found: {$serviceName}. Did you forget " .
"to call registerProcessor()?");
}
// Dispatch processing to the stored processor
$processor = $this->serviceProcessorMap_[$serviceName];
return $processor->process(
new StoredMessageProtocol($input, $messageName, $mtype, $rseqid),
$output
);
}
}
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