<commit_before>#ifndef SIOUX_SOURCE_PUBSUB_HTTP_CONNECTOR_H
#define SIOUX_SOURCE_PUBSUB_HTTP_CONNECTOR_H

#include <boost/shared_ptr.hpp>
#include <boost/asio/deadline_timer.hpp>
#include "pubsub_http/response_decl.h"
#include "pubsub_http/sessions.h"
#include "http/request.h"
#include "server/secure_session_generator.h"

namespace http {
    class request_header;
}

namespace server {
    class async_response;
}

namespace pubsub
{
    class root;

/**
    @namespace pubsub::http

    # pubsub/http

    Implements a protocol similar to bayeux, but simpler and with observing data, not receiving messages in mind.
    A client subscribes to a versioned data object. The protocol does not guarantie, that the client will see every
    update to the subscribed object. The protocol does not guarantie that changes made to two observed objects are
    communicated to the client in the order, in which the changes where made.

    ## Protocol

    The server receives http posts with a json encoded message body. The message must be an object with zero or more
    commands and an optional session id. If a session id is not given, the service will respond with a newly generated session id.
    That session id has to be used by the client in every subsequent http post. If the list of commands is empty or missing,
    a session id must be given. The session id value itseld should be treated like an opaque value by a client.

    ### Invalid first message:

        { }

    ### Valid first messages:

        { "id": "ad77df7gb2z7", "cmd": [ { "subscribe": { "a":1 ,"b":2 }, "version": 34 } ] }
        { "cmd": [ { "subscribe": { "a":1 ,"b":2 }, "version": 34 } ] }
        { "id": "ad77df7gb2z7" }

    If a client wants to poll the server, it can so by simply sending it's session id:

        { "id": 123123 }

    The server responses to the client with an object encoded as http response. The object contains two fields,
    one with the session id, one array with the responses to the clients commands.
    For every command send by the client, the server will respond  with a respond or update. But, the responses might be out of
    order and they dont have to be in the same http response as the commands where. So for example, a https post
    could contain 2 subscriptions. The response to the https post might just contain the respond (an update) to the second
    subscription, while a subsequent http post response contains the response to the first subscription.
    The server even might answer with just a newly created id. If there is nothing to communicate to the client (no newly<commit_msg>typos<commit_after>#ifndef SIOUX_SOURCE_PUBSUB_HTTP_CONNECTOR_H
#define SIOUX_SOURCE_PUBSUB_HTTP_CONNECTOR_H

#include <boost/shared_ptr.hpp>
#include <boost/asio/deadline_timer.hpp>
#include "pubsub_http/response_decl.h"
#include "pubsub_http/sessions.h"
#include "http/request.h"
#include "server/secure_session_generator.h"

namespace http {
    class request_header;
}

namespace server {
    class async_response;
}

namespace pubsub
{
    class root;

/**
    @namespace pubsub::http

    # pubsub/http

    Implements a protocol similar to bayeux, but simpler and with observing data, not receiving messages in mind.
    A client subscribes to one or more versioned data objects. The protocol does not guarantie, that the client will see every
    update to the subscribed objects. The protocol does not guarantie that changes made to two observed objects are
    communicated to the client in the order, in which the changes where made.

    ## Protocol

    The server receives http posts with a json encoded message body. The message must be an object with zero or more
    commands and an optional session id. If a session id is not given, the server will respond with a newly generated session id.
    That session id has to be used by the client in every subsequent http post. If the list of commands is empty or missing,
    a session id must be given. The session id value itseld should be treated like an opaque value by a client.

    ### Invalid first message:

        { }

    ### Valid first messages:

        { "id": "ad77df7gb2z7", "cmd": [ { "subscribe": { "a":1 ,"b":2 }, "version": 34 } ] }
        { "cmd": [ { "subscribe": { "a":1 ,"b":2 }, "version": 34 } ] }
        { "id": "ad77df7gb2z7" }

    If a client wants to poll the server, it can so by simply sending it's session id:

        { "id": 123123 }

    The server responses to the client with an object encoded as http response. The object contains two fields,
    one with the session id, one array with the responses to the clients commands.
    For every command send by the client, the server will respond  with a respond or update. But, the responses might be out of
    order and they dont have to be in the same http response as the commands where. So for example, a https post
    could contain 2 subscriptions. The response to the https post might just contain the respond (an update) to the second
    subscription, while a subsequent http post response contains the response to the first subscription.
    The server even might answer with just a newly created id. If there is nothing to communicate to the client (no newly
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