src/php/lib/Grpc/AbstractCall.php

<?php
/*
 *
 * Copyright 2015, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 */
namespace Grpc;

abstract class AbstractCall {

  protected $call;
  protected $deserialize;
  protected $metadata;

  /**
   * Create a new Call wrapper object.
   * @param Channel $channel The channel to communicate on
   * @param string $method The method to call on the remote server
   * @param callback $deserialize A callback function to deserialize
   * the response
   * @param (optional) long $timeout Timeout in microseconds
   */
  public function __construct(Channel $channel, $method, $deserialize, $timeout = false) {
    if ($timeout) {
      $now = Timeval::now();
      $delta = new Timeval($timeout);
      $deadline = $now->add($delta);
    } else {
      $deadline = Timeval::infFuture();
    }
    $this->call = new Call($channel, $method, $deadline);
    $this->deserialize = $deserialize;
    $this->metadata = null;
  }

  /**
   * @return The metadata sent by the server.
   */
  public function getMetadata() {
    return $this->metadata;
  }

  /**
   * Cancels the call
   */
  public function cancel() {
    $this->call->cancel();
  }

  /**
   * Deserialize a response value to an object.
   * @param string $value The binary value to deserialize
   * @return The deserialized value
   */
  protected function deserializeResponse($value) {
    if ($value === null) {
      return null;
    }
    return call_user_func($this->deserialize, $value);
  }
}