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<?php
/*
*
* Copyright 2018 gRPC authors.
*
* Licensed 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.
*
*/
namespace Grpc\Gcp;
/**
* ChannelRef is used to record how many active streams the channel has.
* This is a private class
*/
class ChannelRef
{
// $opts has all information except Credentials for creating a Grpc\Channel.
private $opts;
private $channel_id;
private $affinity_ref;
private $active_stream_ref;
private $target;
private $has_deserialized;
private $real_channel;
public function __construct($target, $channel_id, $opts, $affinity_ref=0, $active_stream_ref=0)
{
$this->target = $target;
$this->channel_id = $channel_id;
$this->affinity_ref = $affinity_ref;
$this->active_stream_ref = $active_stream_ref;
$this->opts = $opts;
$this->has_deserialized = new CreatedByDeserializeCheck();
}
public function getRealChannel($credentials)
{
// TODO(ddyihai): remove this check once the serialize handler for
// \Grpc\Channel is implemented(issue https://github.com/grpc/grpc/issues/15870).
if (!$this->has_deserialized->getData()) {
// $real_channel exists and is not created by the deserialization.
return $this->real_channel;
}
// If this ChannelRef is created by deserialization, $real_channel is invalid
// thus needs to be recreated becasue Grpc\Channel don't have serialize and
// deserialize handler.
// Since [target + augments + credentials] will be the same during the recreation,
// it will reuse the underline grpc channel in C extension without creating a
// new connection.
// 'credentials' in the array $opts will be unset during creating the channel.
if (!array_key_exists('credentials', $this->opts)) {
$this->opts['credentials'] = $credentials;
}
$real_channel = new \Grpc\Channel($this->target, $this->opts);
$this->real_channel = $real_channel;
// Set deserialization to false so it won't be recreated within the same script.
$this->has_deserialized->setData(0);
return $real_channel;
}
public function getAffinityRef()
{
return $this->affinity_ref;
}
public function getActiveStreamRef()
{
return $this->active_stream_ref;
}
public function affinityRefIncr()
{
$this->affinity_ref += 1;
}
public function affinityRefDecr()
{
$this->affinity_ref -= 1;
}
public function activeStreamRefIncr()
{
$this->active_stream_ref += 1;
}
public function activeStreamRefDecr()
{
$this->active_stream_ref -= 1;
}
}
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