diff options
| -rw-r--r-- | doc/afb-events-guide.html | 13 | ||||
| -rw-r--r-- | doc/afb-events-guide.md | 7 | ||||
| -rw-r--r-- | doc/signaling-basis.svg | 145 | ||||
| -rw-r--r-- | include/afb/afb-binding.h | 17 | ||||
| -rw-r--r-- | include/afb/afb-service-itf.h | 46 |
5 files changed, 220 insertions, 8 deletions
diff --git a/doc/afb-events-guide.html b/doc/afb-events-guide.html index aa606400..c554feab 100644 --- a/doc/afb-events-guide.html +++ b/doc/afb-events-guide.html @@ -5,7 +5,7 @@ <meta name="generator" content="pandoc"> <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes"> <meta name="author" content="José Bollo"> - <title>Guid for developing with events</title> + <title>Guide for developing with events</title> <style type="text/css">code{white-space: pre;}</style> <style type="text/css"> div.sourceCode { overflow-x: auto; } @@ -51,13 +51,14 @@ code > span.in { color: #60a0b0; font-weight: bold; font-style: italic; } /* Inf </head> <body> <header> -<h1 class="title">Guid for developing with events</h1> +<h1 class="title">Guide for developing with events</h1> <h2 class="author">José Bollo</h2> -<h3 class="date">16 septembre 2016</h3> +<h3 class="date">19 septembre 2016</h3> </header> <nav id="TOC"> <ul> -<li><a href="#guid-for-developing-with-events">Guid for developing with events</a><ul> +<li><a href="#guide-for-developing-with-events">Guide for developing with events</a><ul> +<li><a href="#overview-of-events">Overview of events</a><ul> <li><a href="#subscribing-and-unsubscribing">Subscribing and unsubscribing</a></li> <li><a href="#generating-and-pushing-signals-and-data">Generating and pushing signals and data</a></li> <li><a href="#receiving-the-signals">Receiving the signals</a></li> @@ -76,11 +77,13 @@ code > span.in { color: #60a0b0; font-weight: bold; font-style: italic; } /* Inf <li><a href="#strict-separation">Strict separation</a></li> <li><a href="#soft-composition">Soft composition</a></li> </ul></li> +</ul></li> </ul> </nav> -<h2 id="guid-for-developing-with-events">Guid for developing with events</h2> +<h1 id="guide-for-developing-with-events">Guide for developing with events</h1> <p>Signaling agents are services that send events to any clients that subscribed for receiving it. The sent events carry any data.</p> <p>To have a good understanding of how to write a signaling agent, the actions of subscribing, unsubscribing, producing, sending, receiving events must be described and explained.</p> +<h2 id="overview-of-events">Overview of events</h2> <p>The basis of a signaling agent is shown on the following figure:</p> <figure> <img src="signaling-basis.svg" alt="scenario of using events" /><figcaption>scenario of using events</figcaption> diff --git a/doc/afb-events-guide.md b/doc/afb-events-guide.md index 488c52af..f24bef3f 100644 --- a/doc/afb-events-guide.md +++ b/doc/afb-events-guide.md @@ -1,5 +1,5 @@ -Guid for developing with events -------------------------------- +Guide for developing with events +================================ Signaling agents are services that send events to any clients that subscribed for receiving it. The sent events carry any data. @@ -8,6 +8,9 @@ To have a good understanding of how to write a signaling agent, the actions of subscribing, unsubscribing, producing, sending, receiving events must be described and explained. +Overview of events +------------------ + The basis of a signaling agent is shown on the following figure:  diff --git a/doc/signaling-basis.svg b/doc/signaling-basis.svg new file mode 100644 index 00000000..b13fcf17 --- /dev/null +++ b/doc/signaling-basis.svg @@ -0,0 +1,145 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/PR-SVG-20010719/DTD/svg10.dtd"> +<svg width="46cm" height="30cm" viewBox="152 40 918 592" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> + <g> + <line style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" x1="792.796" y1="114.769" x2="197.12" y2="115.607"/> + <polyline style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" points="776.804,119.791 792.796,114.769 792.796,114.769 "/> + <text font-size="12.7998" style="fill: #000000;text-anchor:middle;font-family:sans-serif;font-style:normal;font-weight:normal" x="494.958" y="125.188">request-data</text> + </g> + <g> + <rect style="fill: #ffffff" x="153" y="43" width="67.35" height="36"/> + <rect style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" x="153" y="43" width="67.35" height="36"/> + <text font-size="12.7998" style="fill: #000000;text-anchor:middle;font-family:sans-serif;font-style:normal;font-weight:normal" x="186.675" y="64.9"> + <tspan x="186.675" y="64.9">client 1</tspan> + </text> + <line style="fill: none; fill-opacity:0; stroke-width: 1; stroke: #000000" x1="163" y1="67.9" x2="210.35" y2="67.9"/> + </g> + <g> + <rect style="fill: #ffffff" x="305.5" y="43.7" width="67.35" height="36"/> + <rect style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" x="305.5" y="43.7" width="67.35" height="36"/> + <text font-size="12.7998" style="fill: #000000;text-anchor:middle;font-family:sans-serif;font-style:normal;font-weight:normal" x="339.175" y="65.6"> + <tspan x="339.175" y="65.6">client 2</tspan> + </text> + <line style="fill: none; fill-opacity:0; stroke-width: 1; stroke: #000000" x1="315.5" y1="68.6" x2="362.85" y2="68.6"/> + </g> + <g> + <rect style="fill: #ffffff" x="502" y="42" width="97.25" height="36"/> + <rect style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" x="502" y="42" width="97.25" height="36"/> + <text font-size="12.7998" style="fill: #000000;text-anchor:middle;font-family:sans-serif;font-style:normal;font-weight:normal" x="550.625" y="63.9"> + <tspan x="550.625" y="63.9">: framework</tspan> + </text> + <line style="fill: none; fill-opacity:0; stroke-width: 1; stroke: #000000" x1="512" y1="66.9" x2="589.25" y2="66.9"/> + </g> + <g> + <rect style="fill: #ffffff" x="746" y="43" width="118.7" height="36"/> + <rect style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" x="746" y="43" width="118.7" height="36"/> + <text font-size="12.7998" style="fill: #000000;text-anchor:middle;font-family:sans-serif;font-style:normal;font-weight:normal" x="805.35" y="64.9"> + <tspan x="805.35" y="64.9">signaling agent</tspan> + </text> + <line style="fill: none; fill-opacity:0; stroke-width: 1; stroke: #000000" x1="756" y1="67.9" x2="854.7" y2="67.9"/> + </g> + <line style="fill: none; fill-opacity:0; stroke-width: 2; stroke-dasharray: 4; stroke: #000000" x1="186.675" y1="79" x2="187" y2="629"/> + <line style="fill: none; fill-opacity:0; stroke-width: 2; stroke-dasharray: 4; stroke: #000000" x1="339.175" y1="79.7" x2="338.826" y2="630.701"/> + <line style="fill: none; fill-opacity:0; stroke-width: 2; stroke-dasharray: 4; stroke: #000000" x1="550.625" y1="78" x2="550.326" y2="628.401"/> + <line style="fill: none; fill-opacity:0; stroke-width: 2; stroke-dasharray: 4; stroke: #000000" x1="805.35" y1="79" x2="802.826" y2="629.101"/> + <g> + <line style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" x1="789.968" y1="260.433" x2="349.441" y2="261.423"/> + <polyline style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" points="773.979,265.468 789.968,260.433 789.968,260.433 "/> + <text font-size="12.7998" style="fill: #000000;text-anchor:middle;font-family:sans-serif;font-style:normal;font-weight:normal" x="569.704" y="270.928">request-data</text> + </g> + <g> + <line style="fill: none; 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fill-opacity:0; stroke-width: 2; stroke-dasharray: 4; stroke: #000000" x1="1037.42" y1="77.2295" x2="1037.16" y2="628.967"/> + <g> + <line style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" x1="1020.16" y1="131.163" x2="808.06" y2="131.163"/> + <polygon style="fill: #000000" points="1020.16,136.163 1036.16,131.163 1020.16,126.163 "/> + <polygon style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" points="1020.16,136.163 1036.16,131.163 1020.16,126.163 "/> + <text font-size="12.7998" style="fill: #000000;text-anchor:middle;font-family:sans-serif;font-style:normal;font-weight:normal" x="922.611" y="141.163">setup</text> + </g> + <g> + <line style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" x1="813.303" y1="380.216" x2="1037.15" y2="380.064"/> + <polyline style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" points="829.299,375.206 813.303,380.216 813.303,380.216 "/> + <text font-size="12.7998" style="fill: #000000;text-anchor:middle;font-family:sans-serif;font-style:normal;font-weight:normal" x="925.228" y="390.14"><< wake up >></text> + </g> + <g> + <line style="fill: none; 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fill-opacity:0; stroke-width: 2; stroke: #000000" x="792.796" y="114.769" width="25.4558" height="100.409"/> + </g> + <g> + <rect style="fill: #ffffff" x="323.985" y="261.423" width="25.4558" height="76.2161"/> + <rect style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" x="323.985" y="261.423" width="25.4558" height="76.2161"/> + </g> + <g> + <rect style="fill: #ffffff" x="789.968" y="260.433" width="25.4558" height="76.2161"/> + <rect style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" x="789.968" y="260.433" width="25.4558" height="76.2161"/> + </g> + <g> + <rect style="fill: #ffffff" x="787.847" y="380.216" width="25.4558" height="103.086"/> + <rect style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" x="787.847" y="380.216" width="25.4558" height="103.086"/> + </g> + <g> + <rect style="fill: #ffffff" x="532.581" y="408.076" width="25.4558" height="76.2161"/> + <rect style="fill: none; fill-opacity:0; stroke-width: 2; stroke: #000000" x="532.581" y="408.076" width="25.4558" height="76.2161"/> + </g> +</svg> diff --git a/include/afb/afb-binding.h b/include/afb/afb-binding.h index 7d5da112..43075df1 100644 --- a/include/afb/afb-binding.h +++ b/include/afb/afb-binding.h @@ -172,6 +172,23 @@ struct afb_binding_interface /* * Function for registering the binding + * + * A binding V1 MUST have a function of this name and signature. + * This function is called during loading of the binding. It + * receives an 'interface' that should be recorded for later access to + * functions provided by the framework. + * + * This function MUST return the address of a structure that describes + * the binding and its implemented verbs. + * + * In case of initialisation error, NULL must be returned. + * + * Be aware that the given 'interface' is not fully functionnal + * because no provision is given to the name and description + * of the binding. Check the function 'afbBindingV1ServiceInit' + * defined in the file <afb/afb-service-itf.h> because when + * the function 'afbBindingV1ServiceInit' is called, the 'interface' + * is fully functionnal. */ extern const struct afb_binding *afbBindingV1Register (const struct afb_binding_interface *interface); diff --git a/include/afb/afb-service-itf.h b/include/afb/afb-service-itf.h index 1218cd5b..9b7ae739 100644 --- a/include/afb/afb-service-itf.h +++ b/include/afb/afb-service-itf.h @@ -20,22 +20,66 @@ /* avoid inclusion of <json-c/json.h> */ struct json_object; +/* + * Interface for internal of services + * It records the functions to be called for the request. + * Don't use this structure directly. + * Use the helper functions documented below. + */ struct afb_service_itf { + /* CAUTION: respect the order, add at the end */ + void (*call)(void *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *callback_closure); }; +/* + * Object that encapsulate accesses to service items + */ struct afb_service { const struct afb_service_itf *itf; void *closure; }; +/* + * When a binding have an exported implementation of the + * function 'afbBindingV1ServiceInit', defined below, + * the framework calls it for initialising the service after + * registration of all bindings. + * + * The object 'service' should be recorded. It has functions that + * allows the binding to call features with its own personality. + * + * The function should return 0 in case of success or, else, should return + * a negative value. + */ extern int afbBindingV1ServiceInit(struct afb_service service); +/* + * When a binding have an implementation of the function 'afbBindingV1ServiceEvent', + * defined below, the framework calls that function for any broadcasted event or for + * events that the service subscribed to in its name. + * + * It receive the 'event' name and its related data in 'object' (be aware that 'object' + * might be NULL). + */ extern void afbBindingV1ServiceEvent(const char *event, struct json_object *object); -static inline void afb_service_call(struct afb_service service, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *callback_closure) +/* + * Calls the 'verb' of the 'api' with the arguments 'args' and 'verb' in the name of the binding. + * The result of the call is delivered to the 'callback' function with the 'callback_closure'. + * + * The 'callcack' receives 3 arguments: + * 1. 'closure' the user defined closure pointer 'callback_closure', + * 2. 'iserror' a boolean status being true (not null) when an error occured, + * 2. 'result' the resulting data as a JSON object. + * + * See also 'afb_req_subcall' + * + * Returns 0in case of success or -1 in case of error. + */ +static inline void afb_service_call(struct afb_service service, const char *api, const char *verb, struct json_object *args, void (*callback)(void*closure, int iserror, struct json_object *result), void *callback_closure) { service.itf->call(service.closure, api, verb, args, callback, callback_closure); } |
