示例一:

利用通道pop会自动挂起当前协程,等待生产者推送数据的特性,实现并发调用,并在协程完成后组合结果集。

$serv = new Swoole\Http\Server("127.0.0.1", 9503, SWOOLE_BASE);

$serv->on('request', function ($req, $resp) {
    $chan = new Swoole\Coroutine\Channel(2);
    go(function () use ($chan) {
        $cli = new Swoole\Coroutine\Http\Client('www.qq.com', 80);
        $cli->set(['timeout' => 10]);
        $cli->setHeaders([
            'Host' => "www.qq.com",
            'User-Agent' => 'Chrome/49.0.2587.3',
            'Accept' => 'text/html,application/xhtml+xml,application/xml',
            'Accept-Encoding' => 'gzip',
        ]);
        $ret = $cli->get('/');
        $chan->push(['www.qq.com' => $cli->body]);
    });

    go(function () use ($chan) {
        $cli = new Swoole\Coroutine\Http\Client('www.baidu.com', 80);
        $cli->set(['timeout' => 10]);
        $cli->setHeaders([
            'Host' => "www.baidu.com",
            'User-Agent' => 'Chrome/49.0.2587.3',
            'Accept' => 'text/html,application/xhtml+xml,application/xml',
            'Accept-Encoding' => 'gzip',
        ]);
        $ret = $cli->get('/');
        $chan->push(['www.baidu.com' => $cli->body]);
    });

    $result = [];
    for ($i = 0; $i < 2; $i++)
    {
        // 当通道为空时,会自动挂起当前协程,等待生产者推送数据后,重新调度进来
        $result += $chan->pop();
    }
    $resp->end(json_encode($result));
});
$serv->start();

示例二:

利用Swoole封装好的WaitGroup类,实现并发调用,并在协程完成后组合结果集。

底层也是基于通道的计数、push和pop实现的。

<?php
Co\run(function () {
    $wg = new \Swoole\Coroutine\WaitGroup();
    $result = [];

    // 增加第一个计数
    $wg->add();
    // 启动第一个协程
    go(function () use ($wg, &$result) {
        //启动一个协程客户端client,请求淘宝首页
        $cli = new \Swoole\Coroutine\Http\Client('www.taobao.com', 443, true);
        $cli->setHeaders([
            'Host' => 'www.taobao.com',
            'User-Agent' => 'Chrome/49.0.2587.3',
            'Accept' => 'text/html,application/xhtml+xml,application/xml',
            'Accept-Encoding' => 'gzip',
        ]);
        $cli->set(['timeout' => 1]);
        $cli->get('/index.php');

        $result['taobao'] = $cli->body;
        $cli->close();

        // 标记任务完成
        $wg->done();
    });

    // 增加第二个计数
    $wg->add();
    // 启动第二个协程
    go(function () use ($wg, &$result) {
        //启动一个协程客户端client,请求百度首页
        $cli = new \Swoole\Coroutine\Http\Client('www.baidu.com', 443, true);
        $cli->setHeaders([
            'Host' => 'www.baidu.com',
            'User-Agent' => 'Chrome/49.0.2587.3',
            'Accept' => 'text/html,application/xhtml+xml,application/xml',
            'Accept-Encoding' => 'gzip',
        ]);
        $cli->set(['timeout' => 1]);
        $cli->get('/index.php');

        $result['baidu'] = $cli->body;
        $cli->close();

        // 标记任务完成
        $wg->done();
    });

    // 挂起当前协程,等待所有任务完成后恢复当前协程的执行
    $wg->wait();
    //这里 $result 包含了 2 个任务执行结果
    var_dump($result);
});
04-08 14:18