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Editing: DefaultCallInvoker.php

<?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;

/**
 * Default call invoker in the gRPC stub.
 */
class DefaultCallInvoker implements CallInvoker
{
    public function createChannelFactory($hostname, $opts) {
        return new Channel($hostname, $opts);
    }

public function UnaryCall($channel, $method, $deserialize, $options) {
        return new UnaryCall($channel, $method, $deserialize, $options);
    }

public function ClientStreamingCall($channel, $method, $deserialize, $options) {
        return new ClientStreamingCall($channel, $method, $deserialize, $options);
    }

public function ServerStreamingCall($channel, $method, $deserialize, $options) {
        return new ServerStreamingCall($channel, $method, $deserialize, $options);
    }

public function BidiStreamingCall($channel, $method, $deserialize, $options) {
        return new BidiStreamingCall($channel, $method, $deserialize, $options);
    }
}

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