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<?php

namespace React\Socket;

/**
 * The `ConnectorInterface` is responsible for providing an interface for
 * establishing streaming connections, such as a normal TCP/IP connection.
 *
 * This is the main interface defined in this package and it is used throughout
 * React's vast ecosystem.
 *
 * Most higher-level components (such as HTTP, database or other networking
 * service clients) accept an instance implementing this interface to create their
 * TCP/IP connection to the underlying networking service.
 * This is usually done via dependency injection, so it's fairly simple to actually
 * swap this implementation against any other implementation of this interface.
 *
 * The interface only offers a single `connect()` method.
 *
 * @see ConnectionInterface
 */
interface ConnectorInterface
{
    /**
     * Creates a streaming connection to the given remote address
     *
     * If returns a Promise which either fulfills with a stream implementing
     * `ConnectionInterface` on success or rejects with an `Exception` if the
     * connection is not successful.
     *
     * ```php
     * $connector->connect('google.com:443')->then(
     *     function (React\Socket\ConnectionInterface $connection) {
     *         // connection successfully established
     *     },
     *     function (Exception $error) {
     *         // failed to connect due to $error
     *     }
     * );
     * ```
     *
     * The returned Promise MUST be implemented in such a way that it can be
     * cancelled when it is still pending. Cancelling a pending promise MUST
     * reject its value with an Exception. It SHOULD clean up any underlying
     * resources and references as applicable.
     *
     * ```php
     * $promise = $connector->connect($uri);
     *
     * $promise->cancel();
     * ```
     *
     * @param string $uri
     * @return \React\Promise\PromiseInterface<ConnectionInterface>
     *     Resolves with a `ConnectionInterface` on success or rejects with an `Exception` on error.
     * @see ConnectionInterface
     */
    public function connect($uri);
}