{"id":73065,"date":"2020-03-06T20:42:13","date_gmt":"2020-03-06T17:42:13","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/rabbitmq-chast-3-razbiraemsya-s-queues-i-bindings"},"modified":"2020-03-06T20:42:13","modified_gmt":"2020-03-06T17:42:13","slug":"rabbitmq-chast-3-razbiraemsya-s-queues-i-bindings","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/rabbitmq-chast-3-razbiraemsya-s-queues-i-bindings","title":{"rendered":"RabbitMQ. \u010c\u00e1st 3. Zkoum\u00e1me Queues a Bindings","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><code>Fronta<\/code> (fronta) \u2014 datov\u00e1 struktura na disku nebo v pam\u011bti, kter\u00e1 uchov\u00e1v\u00e1 odkazy na zpr\u00e1vy a poskytuje jejich kopie <code>spot\u0159ebitel\u00e9<\/code> (pro spot\u0159ebitele). <code>Fronta<\/code> p\u0159edstavuje <noindex><a rel=\"nofollow\" href=\"http:\/\/erlang.org\/doc\/reference_manual\/processes.html\">Erlang proces<\/a><\/noindex> se stavem (kde mohou b\u00fdt zpr\u00e1vy tak\u00e9 ukl\u00e1d\u00e1ny do cache). 1 000 front m\u016f\u017ee zab\u00edrat p\u0159ibli\u017en\u011b 80 MB.<\/p>\n<p><\/p>\n<p><code>Binding<\/code> (p\u0159ipojen\u00ed) \u2014 pravidlo, kter\u00e9 informuje v\u00fdm\u011bn\u00edk, do kter\u00e9 fronty maj\u00ed zpr\u00e1vy sm\u011b\u0159ovat.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3 id=\"oglavlenie\">Obsah<\/h3>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/488654\/\">RabbitMQ. \u010c\u00e1st 1. \u00davod. Erlang, AMQP a RPC<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/489086\/\">RabbitMQ. \u010c\u00e1st 2. Zkoum\u00e1me Exchanges<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/490960\/\">RabbitMQ. \u010c\u00e1st 3. Zkoum\u00e1me Queues a Bindings<\/a><\/noindex><\/li>\n<li>RabbitMQ. \u010c\u00e1st 4. Zkoum\u00e1me, co jsou zpr\u00e1vy a r\u00e1my<\/li>\n<li>RabbitMQ. \u010c\u00e1st 5. V\u00fdkon publikace a spot\u0159eby zpr\u00e1v<\/li>\n<li>RabbitMQ. \u010c\u00e1st 6. P\u0159ehled modul\u016f Federation a Shovel<\/li>\n<li>RabbitMQ. \u010c\u00e1st 7. Podrobn\u011b o Connection a Channel<\/li>\n<li>RabbitMQ. \u010c\u00e1st 8. RabbitMQ v .NET<\/li>\n<li>RabbitMQ. \u010c\u00e1st 9. Monitorov\u00e1n\u00ed<\/li>\n<\/ul>\n<p><\/p>\n<h4 id=\"vremennye-ocheredi\"><em>Do\u010dasn\u00e9 fronty<\/em><\/h4>\n<p><\/p>\n<p>Pokud je fronta vytvo\u0159ena s nastaven\u00fdm parametrem <code>autoDelete<\/code>, pak takov\u00e1 fronta z\u00edsk\u00e1v\u00e1 schopnost <strong>automaticky se odstranit<\/strong>. Tyto fronty se obvykle vytv\u00e1\u0159ej\u00ed v okam\u017eiku p\u0159ipojen\u00ed prvn\u00edho klienta a odstra\u0148uj\u00ed se ve chv\u00edli, kdy se v\u0161ichni klienti odpoj\u00ed. <\/p>\n<p><\/p>\n<p>Pokud je fronta vytvo\u0159ena s nastaven\u00fdm parametrem <code>exkluzivn\u00ed<\/code>, pak takov\u00e1 fronta <strong>umo\u017e\u0148uje p\u0159ipojen\u00ed pouze jednomu spot\u0159ebiteli<\/strong> a bude odstran\u011bna, pokud se kan\u00e1l zav\u0159e. Dokud nebude kan\u00e1l uzav\u0159en, m\u016f\u017ee se klient odpojovat\/p\u0159ipojovat, ale pouze v r\u00e1mci stejn\u00e9ho spojen\u00ed. Pokud je parametru <code>exkluzivn\u00ed<\/code> n nastaven, pak parametr <code>autoDelete<\/code> nem\u00e1 \u017e\u00e1dn\u00fd \u00fa\u010dinek.<\/p>\n<p><\/p>\n<p>Vlastnosti:<\/p>\n<p><\/p>\n<ul>\n<li>p\u0159i kr\u00e1tkodob\u00e9m p\u0159eru\u0161en\u00ed spojen\u00ed budeme ztr\u00e1cet zpr\u00e1vy, kter\u00e9 se je\u0161t\u011b nestihly dostat k spot\u0159ebiteli<\/li>\n<li>m\u016f\u017eeme zachytit fenom\u00e9n <code>binding churn<\/code>. Tento fenom\u00e9n nast\u00e1v\u00e1, kdy\u017e po\u010det operac\u00ed vytv\u00e1\u0159en\u00ed\/odstra\u0148ov\u00e1n\u00ed front a p\u0159ipojen\u00ed dos\u00e1hne velmi vysok\u00fdch hodnot. V klastrov\u00e9m re\u017eimu se tento tok operac\u00ed roz\u0161\u00ed\u0159\u00ed po v\u0161ech uzlech a vytvo\u0159\u00ed velk\u00e9 zat\u00ed\u017een\u00ed. Tento proces lze optimalizovat kontrolou po\u010dtu p\u0159edplatn\u00e9ho.<\/li>\n<\/ul>\n<p><\/p>\n<h4 id=\"postoyannye-ocheredi\"><em>Trval\u00e9 fronty<\/em><\/h4>\n<p><\/p>\n<p>Pokud je fronta vytvo\u0159ena s nastaven\u00fdm parametrem <code>durable<\/code>, pak takov\u00e1 fronta <strong>uchov\u00e1vaj\u00ed sv\u016fj stav<\/strong> a obnovuj\u00ed se po restartu serveru\/brokera. Tato fronta bude existovat, dokud nebude provedena objedn\u00e1vka <code>Queue.Delete<\/code>. <\/p>\n<p><\/p>\n<h4 id=\"highly-available-ocheredi\"><em>Vysoko dostupn\u00e9 fronty<\/em><\/h4>\n<p><\/p>\n<p>Fronty HA vy\u017eaduj\u00ed clustrov\u00e9 prost\u0159ed\u00ed RabbitMQ. V klastrov\u00e9m re\u017eimu budou v\u0161echny informace o v\u00fdm\u011bn\u00e1ch, front\u00e1ch, p\u0159ipojen\u00edch a spot\u0159ebitel\u00edch zkop\u00edrov\u00e1ny na v\u0161echny uzly.<\/p>\n<p><\/p>\n<p>Kdy\u017e je zpr\u00e1va publikov\u00e1na do n\u011bjak\u00e9 HA fronty, je uchov\u00e1v\u00e1na na ka\u017ed\u00e9m uzlu, kter\u00fd pat\u0159\u00ed k HA front\u011b. Jakmile je zpr\u00e1va zpracov\u00e1na na n\u011bkter\u00e9m z uzl\u016f, v\u0161echny kopie t\u00e9to zpr\u00e1vy budou odstran\u011bny na ostatn\u00edch uzlech. <\/p>\n<p><\/p>\n<p>Fronty HA mohou b\u00fdt roz\u0161\u00ed\u0159eny na v\u0161echny uzly v ur\u010dit\u00e9m clusteru nebo pouze na jednotliv\u00e9. <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"RabbitMQ. \u010c\u00e1st 3. Zkoum\u00e1me Queues a Bindings\" src=\"\/wp-content\/uploads\/2020\/03\/46d560ab33e686ddf9adb0b18b4bb0b0.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Vlastnosti:<\/p>\n<p><\/p>\n<ul>\n<li>pou\u017eit\u00ed HA front vede k penalizac\u00edm v v\u00fdkonu. Kdy\u017e se zpr\u00e1va um\u00edst\u00ed do ur\u010dit\u00e9 HA fronty nebo se zpr\u00e1va spot\u0159ebov\u00e1v\u00e1 z HA fronty, RabbitMQ mus\u00ed prov\u00e9st koordinaci mezi v\u0161emi uzly (2-3 uzly obvykle sta\u010d\u00ed)<\/li>\n<\/ul>\n<p><\/p>\n<h4 id=\"sozdanie-ocheredi\"><em>Vytvo\u0159en\u00ed fronty<\/em><\/h4>\n<p><\/p>\n<p>Vytvo\u0159en\u00ed fronty se prov\u00e1d\u00ed pomoc\u00ed synchronn\u00edho <code>RPC<\/code> \u017e\u00e1dosti k serveru. \u017d\u00e1dost je realizov\u00e1na pomoc\u00ed metody <code>Queue.Declare<\/code>, volan\u00e9 s parametry:<\/p>\n<p><\/p>\n<ul>\n<li>n\u00e1zev fronty<\/li>\n<li>dal\u0161\u00ed parametry<\/li>\n<\/ul>\n<p><\/p>\n<p>P\u0159\u00edklad vytvo\u0159en\u00ed fronty pomoc\u00ed <noindex><a rel=\"nofollow\" href=\"https:\/\/www.rabbitmq.com\/dotnet.html\">RabbitMQ.Client<\/a><\/noindex>:<\/p>\n<p><\/p>\n<pre><code class=\"cs\">\/\/ ...\nchannel.QueueDeclare(\n    queue: &quot;my_queue&quot;,\n    durable: false,\n    exclusive: false,\n    autoDelete: false,\n    arguments: null\n);\n\/\/ ...<\/code><\/pre>\n<p><\/p>\n<ul>\n<li><code>fronta<\/code> \u2014 n\u00e1zev fronty, kterou chceme vytvo\u0159it. N\u00e1zev mus\u00ed b\u00fdt jedine\u010dn\u00fd a nesm\u00ed se shodovat se syst\u00e9mov\u00fdm n\u00e1zvem fronty<\/li>\n<li><code>durable<\/code> \u2014 pokud je true, fronta bude <strong>uchov\u00e1vat sv\u016fj stav<\/strong> a obnov\u00ed se po restartu serveru\/brokera<\/li>\n<li><code>exkluzivn\u00ed<\/code> \u2014 pokud je true, fronta umo\u017en\u00ed p\u0159ipojit se pouze jednomu spot\u0159ebiteli<\/li>\n<li><code>autoDelete<\/code> \u2014 pokud je true, fronta z\u00edsk\u00e1v\u00e1 schopnost <strong>automaticky se odstranit<\/strong><\/li>\n<li><code>arguments<\/code> \u2014 voliteln\u00e9 argumenty. N\u00ed\u017ee rozebere podrobn\u011bji.<\/li>\n<\/ul>\n<p><\/p>\n<h5 id=\"arguments\"><em>arguments<\/em><\/h5>\n<p><\/p>\n<ul>\n<li><code>x-message-ttl<\/code>(<code>x-message-time-to-live<\/code>) \u2014 umo\u017e\u0148uje nastavit \u010dasov\u00fd limit zpr\u00e1vy v milisekund\u00e1ch. Pokud se fronta vytv\u00e1\u0159\u00ed se nastavenou hodnotou argumentu <code>x-message-ttl<\/code>, pak takov\u00e1 fronta bude <strong>automaticky vylu\u010dovat zpr\u00e1vy, jejich\u017e platnost vypr\u0161ela<\/strong>. Nastaven\u00ed hodnoty argumentu <code>x-message-ttl<\/code> ur\u010duje maxim\u00e1ln\u00ed v\u011bk v\u0161ech zpr\u00e1v v t\u00e9to front\u011b. Vytvo\u0159en\u00ed takov\u00e9 fronty <strong>umo\u017e\u0148uje zabr\u00e1nit p\u0159\u00edjmu zastaral\u00fdch informac\u00ed<\/strong>. To lze pou\u017e\u00edt v re\u00e1ln\u00fdch syst\u00e9mech. Pokud m\u00e1 fronta, pro kterou je nastavena v\u00fdm\u011bna pro odm\u00edtnut\u00e9 zpr\u00e1vy, nastavenou hodnotu argumentu <code>x-message-ttl<\/code>, pak odm\u00edtnut\u00e9 zpr\u00e1vy v t\u00e9to front\u011b <strong>za\u010dnou m\u00edt dobu platnosti<\/strong>.<\/li>\n<li><code>x-expires<\/code> \u2014 ur\u010duje hodnotu v milisekund\u00e1ch, po jej\u00edm\u017e uplynut\u00ed dojde k odstran\u011bn\u00ed fronty. Fronta m\u016f\u017ee vy\u010derpat svou \u017eivotnost pouze v p\u0159\u00edpad\u011b, \u017ee nem\u00e1 \u017e\u00e1dn\u00e9 odb\u011bratele. Pokud jsou k front\u011b p\u0159ipojeni odb\u011bratel\u00e9, m\u016f\u017ee se automaticky odstranit pouze tehdy, kdy\u017e v\u0161ichni odb\u011bratel\u00e9 vyvolaj\u00ed <code>Basic.Cancel<\/code> nebo se odpoj\u00ed. Doba \u017eivota fronty m\u016f\u017ee vypr\u0161et pouze v p\u0159\u00edpad\u011b, \u017ee k n\u00ed nebyl po\u017eadavek <code>Basic.Get<\/code>. Jinak se aktu\u00e1ln\u00ed hodnota nastaven\u00ed \u017eivotnosti resetuje a fronta se ji\u017e nebude automaticky odstra\u0148ovat. Tak\u00e9 <strong>nen\u00ed zaru\u010deno, jak rychle dojde k odstran\u011bn\u00ed fronty po uplynut\u00ed jej\u00edho \u017eivotn\u00edho cyklu<\/strong>.<\/li>\n<li><code>x-max-length<\/code> \u2014 ur\u010duje maxim\u00e1ln\u00ed po\u010det zpr\u00e1v ve front\u011b. Pokud po\u010det zpr\u00e1v ve front\u011b za\u010dne p\u0159ekra\u010dovat maxim\u00e1ln\u00ed po\u010det, za\u010dnou se odstra\u0148ovat nejstar\u0161\u00ed<\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"RabbitMQ. \u010c\u00e1st 3. Zkoum\u00e1me Queues a Bindings\" src=\"\/wp-content\/uploads\/2020\/03\/738f23dcfdd173a66be619032b46c5cc.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<ul>\n<li><code>x-max-length-bytes<\/code> \u2014 ur\u010duje maxim\u00e1ln\u00ed povolenou celkovou velikost payloadu zpr\u00e1v ve front\u011b. P\u0159i p\u0159ekro\u010den\u00ed stanoven\u00e9 hodnoty (doch\u00e1z\u00ed k p\u0159ete\u010den\u00ed fronty p\u0159i dal\u0161\u00ed publikaci zpr\u00e1vy) se nejstar\u0161\u00ed zpr\u00e1vy za\u010dnou odstra\u0148ovat<\/li>\n<li><code>x-overflow<\/code> \u2014 tento argument se pou\u017e\u00edv\u00e1 k nastaven\u00ed chov\u00e1n\u00ed v p\u0159\u00edpad\u011b p\u0159ete\u010den\u00ed fronty. K dispozici jsou dv\u011b hodnoty: <code>drop-head<\/code> (v\u00fdchoz\u00ed hodnota) a <code>reject-publish<\/code>. Pokud zvol\u00edte <code>drop-head<\/code>, budou nejstar\u0161\u00ed zpr\u00e1vy odstran\u011bny. Pokud zvol\u00edte <code>reject-publish<\/code>, p\u0159\u00edjem zpr\u00e1v bude pozastaven<\/li>\n<li><code>x-dead-letter-exchange<\/code> \u2014 ur\u010duje exchange, do kter\u00e9ho jsou sm\u011brov\u00e1ny odm\u00edtnut\u00e9 zpr\u00e1vy, kter\u00e9 nejsou znovu za\u0159azeny do fronty<\/li>\n<li><code>x-dead-letter-routing-key<\/code> \u2014 ur\u010duje voliteln\u00fd kl\u00ed\u010d pro sm\u011brov\u00e1n\u00ed odm\u00edtnut\u00fdch zpr\u00e1v<\/li>\n<li><code>x-max-priority<\/code> \u2014 umo\u017e\u0148uje t\u0159\u00edd\u011bn\u00ed podle priorit ve front\u011b s maxim\u00e1ln\u00ed hodnotou priority 255 (RabbitMQ verze 3.5.0 a vy\u0161\u0161\u00ed). \u010c\u00edslo ud\u00e1v\u00e1 maxim\u00e1ln\u00ed prioritu, kterou fronta podpo\u0159\u00ed. Pokud argument nen\u00ed nastaven, fronta nebude podporovat prioritu zpr\u00e1v<\/li>\n<li><code>x-queue-mode<\/code> \u2014 umo\u017e\u0148uje p\u0159epnout frontu do <strong>l\u00edn\u00e9ho re\u017eimu<\/strong>. V tomto re\u017eimu bude co nejv\u00edce zpr\u00e1v ulo\u017eeno na disku. Pou\u017eit\u00ed opera\u010dn\u00ed pam\u011bti bude minim\u00e1ln\u00ed. Pokud nen\u00ed nastaven, fronta bude uchov\u00e1vat zpr\u00e1vy v pam\u011bti, aby se zpr\u00e1vy doru\u010dovaly co nejrychleji<\/li>\n<li><code>x-queue-master-locator<\/code> \u2014 pokud m\u00e1me cluster, lze nastavit master frontu<\/li>\n<li><code>x-ha-policy<\/code> \u2014 pou\u017e\u00edv\u00e1 se p\u0159i vytv\u00e1\u0159en\u00ed HA front a ur\u010duje, jak bude zpr\u00e1va roz\u0161\u00ed\u0159ena mezi uzly. Pokud je nastavena hodnota <code>all<\/code>, zpr\u00e1va bude ulo\u017eena na v\u0161ech uzlech. Pokud je nastavena hodnota <code>nodes<\/code>, zpr\u00e1va bude ulo\u017eena na konkr\u00e9tn\u00edch uzlech clusteru<\/li>\n<li><code>x-ha-nodes<\/code> \u2014 ur\u010duje uzly, k nim\u017e bude pat\u0159it ur\u010dit\u00e1 fronta <code>HA<\/code><\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"RabbitMQ. \u010c\u00e1st 3. Zkoum\u00e1me Queues a Bindings\" src=\"\/wp-content\/uploads\/2020\/03\/a8f660b6c0a43626e4025cf7769a4425.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Pokud je vytvo\u0159en\u00ed fronty <strong>mo\u017en\u00e9<\/strong>, pak server ode\u0161le klientovi synchronn\u00ed <code>RPC<\/code> odpov\u011b\u010f <code>Queue.DeclareOk<\/code>. Pokud je vytvo\u0159en\u00ed fronty <strong>nemo\u017en\u00e9<\/strong> (do\u0161lo k odm\u00edtnut\u00ed \u017e\u00e1dosti <code>Queue.Declare<\/code>), pak <strong>kan\u00e1l bude uzav\u0159en<\/strong> serverem pomoc\u00ed p\u0159\u00edkazu <code>Channel.Close<\/code> a klient obdr\u017e\u00ed v\u00fdjimku <noindex><a rel=\"nofollow\" href=\"https:\/\/www.rabbitmq.com\/releases\/rabbitmq-dotnet-client\/v3.6.10\/rabbitmq-dotnet-client-3.6.10-client-htmldoc\/html\/type-RabbitMQ.Client.Exceptions.OperationInterruptedException.html\">OperationInterruptedException<\/a><\/noindex>, kter\u00e1 bude obsahovat k\u00f3d chyby a jej\u00ed popis. <\/p>\n<p><\/p>\n<p><strong>Op\u011btovn\u00fd p\u0159\u00edkaz<\/strong> <code>Queue.Declare<\/code> <strong>s podobn\u00fdmi parametry<\/strong> vr\u00e1t\u00ed u\u017eite\u010dn\u00e9 informace o t\u00e9to front\u011b. Nap\u0159\u00edklad celkov\u00fd po\u010det zpr\u00e1v \u010dekaj\u00edc\u00edch ve front\u011b a celkov\u00fd po\u010det spot\u0159ebitel\u016f p\u0159ihl\u00e1\u0161en\u00fdch k n\u00ed. <\/p>\n<p><\/p>\n<p>Zavol\u00e1n\u00ed <code>Queue.Declare<\/code> pod u\u017eivatelsk\u00fdmi \u00fadaji, kter\u00e9mu nebyla p\u0159i\u0159azena pot\u0159ebn\u00e1 opr\u00e1vn\u011bn\u00ed <strong>uzav\u0159e kan\u00e1l<\/strong> pomoc\u00ed p\u0159\u00edkazu <code>Channel.Close<\/code> a klient obdr\u017e\u00ed v\u00fdjimku <noindex><a rel=\"nofollow\" href=\"https:\/\/www.rabbitmq.com\/releases\/rabbitmq-dotnet-client\/v3.6.10\/rabbitmq-dotnet-client-3.6.10-client-htmldoc\/html\/type-RabbitMQ.Client.Exceptions.OperationInterruptedException.html\">OperationInterruptedException<\/a><\/noindex>, kter\u00fd bude obsahovat k\u00f3d chyby <noindex><a rel=\"nofollow\" href=\"https:\/\/developer.mozilla.org\/ru\/docs\/Web\/HTTP\/Status\/403\">403<\/a><\/noindex> a jeho popis.<\/p>\n<p><\/p>\n<p>Jakmile fronta \u010dek\u00e1 d\u00e9le ne\u017e 10 sekund, <strong>p\u0159ech\u00e1z\u00ed do sp\u00e1nkov\u00e9ho re\u017eimu<\/strong>, vyvol\u00e1vaj\u00edc\u00ed GC ve front\u011b, co\u017e vede k v\u00fdrazn\u00e9mu sn\u00ed\u017een\u00ed pam\u011bti pot\u0159ebn\u00e9 pro tuto frontu.<\/p>\n<p><\/p>\n<h4 id=\"sozdanie-queue-cherez-graficheskiy-interfeys\"><em>Vytvo\u0159en\u00ed fronty prost\u0159ednictv\u00edm grafick\u00e9ho rozhran\u00ed<\/em><\/h4>\n<p><\/p>\n<p>P\u0159ejdeme do administr\u00e1torsk\u00e9 panelu <code>RabbitMQ<\/code> pod u\u017eivatelsk\u00fdm jm\u00e9nem <code>guest<\/code> (u\u017eivatelsk\u00e9 jm\u00e9no: <code>guest<\/code> a heslo: <code>guest<\/code>). V\u0161imn\u011bte si, \u017ee u\u017eivatel <code>guest<\/code> se m\u016f\u017ee p\u0159ipojit pouze z m\u00edstn\u00edho hostitele. Nyn\u00ed p\u0159ejdeme na kartu <code>Fronty<\/code> a klikneme na <code>P\u0159idat novou frontu<\/code>. Vypl\u0148te vlastnosti:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"RabbitMQ. \u010c\u00e1st 3. Zkoum\u00e1me Queues a Bindings\" src=\"\/wp-content\/uploads\/2020\/03\/ea77a406ad16f0871c7197e96a66818f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Jakmile zad\u00e1me v\u0161echny pot\u0159ebn\u00e9 \u00fadaje a stiskneme <code>P\u0159idat fronty<\/code>, fronta se objev\u00ed v celkov\u00e9m seznamu.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"RabbitMQ. \u010c\u00e1st 3. Zkoum\u00e1me Queues a Bindings\" src=\"\/wp-content\/uploads\/2020\/03\/8342e044a0d6c0a035a2c9f646035cad.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Kliknut\u00ed na n\u00e1zev fronty zobraz\u00ed jej\u00ed podrobn\u00e9 informace. Zde lze nastavit vazbu mezi v\u00fdm\u011bnou a frontou, zobrazit seznam <code>spot\u0159ebitel\u00e9<\/code>, publikovat\/p\u0159ij\u00edmat zpr\u00e1vy, odstranit frontu a zobrazit statistiky.<\/p>\n<p><\/p>\n<h4 id=\"sozdanie-binding\"><em>Vytvo\u0159en\u00ed vazby<\/em><\/h4>\n<p><\/p>\n<p>Vytvo\u0159en\u00ed vazby prob\u00edh\u00e1 pomoc\u00ed synchronn\u00edho <code>RPC<\/code> \u017e\u00e1dosti k serveru. \u017d\u00e1dost je realizov\u00e1na pomoc\u00ed metody <code>Queue.Bind<\/code>, volan\u00e9 s parametry:<\/p>\n<p><\/p>\n<ul>\n<li>n\u00e1zev fronty<\/li>\n<li>n\u00e1zev bodu v\u00fdm\u011bny<\/li>\n<li>dal\u0161\u00ed parametry<\/li>\n<\/ul>\n<p><\/p>\n<p>P\u0159\u00edklad vytvo\u0159en\u00ed vazby pomoc\u00ed <noindex><a rel=\"nofollow\" href=\"https:\/\/www.rabbitmq.com\/dotnet.html\">RabbitMQ.Client<\/a><\/noindex>:<\/p>\n<p><\/p>\n<pre><code class=\"cs\">\/\/...\nchannel.QueueBind(\n    queue: queueName,\n    exchange: &quot;my_exchange&quot;,\n    routingKey: &quot;my_key&quot;,\n    arguments: null\n);\n\/\/...<\/code><\/pre>\n<p><\/p>\n<ul>\n<li><code>fronta<\/code> \u2014 n\u00e1zev fronty<\/li>\n<li><code>exchange<\/code> \u2014 n\u00e1zev v\u00fdm\u011bn\u00edku<\/li>\n<li><code>routingKey<\/code> \u2014 kl\u00ed\u010d sm\u011brov\u00e1n\u00ed<\/li>\n<li><code>arguments<\/code> \u2014 voliteln\u00e9 argumenty<\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"RabbitMQ. \u010c\u00e1st 3. Zkoum\u00e1me Queues a Bindings\" src=\"\/wp-content\/uploads\/2020\/03\/9123186c94a822309b679f26c2e511ea.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Pokud bylo vytvo\u0159en\u00ed vazby <strong>mo\u017en\u00e9<\/strong>, pak server ode\u0161le klientovi synchronn\u00ed <code>RPC<\/code> odpov\u011b\u010f <code>Queue.BindOk<\/code>.<\/p>\n<p><\/p>\n<h4 id=\"sozdanie-binding-cherez-graficheskiy-interfeys\"><em>Vytvo\u0159en\u00ed vazby prost\u0159ednictv\u00edm grafick\u00e9ho rozhran\u00ed<\/em><\/h4>\n<p><\/p>\n<p>P\u0159ejdeme do administr\u00e1torsk\u00e9 panelu <code>RabbitMQ<\/code> pod u\u017eivatelsk\u00fdm jm\u00e9nem <code>guest<\/code> (u\u017eivatelsk\u00e9 jm\u00e9no: <code>guest<\/code> a heslo: <code>guest<\/code>). V\u0161imn\u011bte si, \u017ee u\u017eivatel <code>guest<\/code> se m\u016f\u017ee p\u0159ipojit pouze z m\u00edstn\u00edho hostitele. Nyn\u00ed p\u0159ejdeme na kartu <code>Fronty<\/code> a klikneme na frontu <code>my_queue<\/code>. Vypl\u0148ujeme pole sekce <code>bindings<\/code>:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"RabbitMQ. \u010c\u00e1st 3. Zkoum\u00e1me Queues a Bindings\" src=\"\/wp-content\/uploads\/2020\/03\/7db6b42a4f29a1860aabe54ade0b6833.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Jakmile zad\u00e1me v\u0161echny pot\u0159ebn\u00e9 \u00fadaje a stiskneme <code>Bind<\/code>, vazba se zobraz\u00ed v celkov\u00e9m seznamu:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"RabbitMQ. \u010c\u00e1st 3. Zkoum\u00e1me Queues a Bindings\" src=\"\/wp-content\/uploads\/2020\/03\/499eda8e8cb061e6feb75c471eb64b92.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<h3 id=\"code\">K\u00f3d<\/h3>\n<p><\/p>\n<p>V t\u00e9to \u010d\u00e1sti pop\u00ed\u0161eme frontu a vazbu pomoc\u00ed k\u00f3du v C#, jako bychom pot\u0159ebovali vytvo\u0159it knihovnu. M\u016f\u017ee to b\u00fdt u\u017eite\u010dn\u00e9 pro pochopen\u00ed.<\/p>\n<p><\/p>\n<pre><code class=\"cs\">public interface IQueue\n    {        \n        string Name { get; }\n\n        \/\/ <summary>\n        \/\/     Pokud je nastavena true, fronta bude trval\u00e1. \n        \/\/     Bude ulo\u017eena na disku a p\u0159e\u017eije \n        \/\/     restart serveru\/brokera. \n        \/\/     Pokud je hodnota false, fronta je do\u010dasn\u00e1 a bude smaz\u00e1na, \n        \/\/     kdy\u017e bude server\/broker restartov\u00e1n\n        \/\/ <\/summary>\n        bool IsDurable { get; }\n\n        \/\/ <summary>\n        \/\/     Pokud je hodnota true, \n        \/\/     tato fronta bude povolovat p\u0159ipojen\u00ed \n        \/\/     pouze jednomu consumeru\n        \/\/ <\/summary>\n        bool IsExclusive { get; }\n\n        \/\/ <summary>\n        \/\/     Automatick\u00e9 odstran\u011bn\u00ed. \n        \/\/     Fronta bude odstran\u011bna, kdy\u017e se v\u0161ichni klienti odpoj\u00ed.\n        \/\/ <\/summary>\n        bool IsAutoDelete { get; }\n\n        \/\/ <summary>\n        \/\/     Voliteln\u00e9 argumenty\n        \/\/ <\/summary>\n        IDictionary Arguments { get; }\n    }<\/code><\/pre>\n<p><\/p>\n<pre><code class=\"cs\">public class Queue : IQueue\n    {\n        public Queue(\n             string name, \n             bool isDurable = true, \n             bool isExclusive = false, \n             bool isAutoDelete = false, \n             IDictionary arguments = null)\n        {\n            Name = name ??\n                throw new ArgumentNullException(name, $\"{name} nesm\u00ed b\u00fdt null\");\n\n            IsDurable = isDurable;\n            IsExclusive = isExclusive;\n            IsAutoDelete = isAutoDelete;\n            Arguments = arguments ?? new Dictionary();\n        }\n\n        public string Name { get; }\n        public bool IsDurable { get; }\n        public bool IsExclusive { get; }\n        public bool IsAutoDelete { get; }\n        public IDictionary Arguments { get; }\n    }<\/code><\/pre>\n<p><\/p>\n<pre><code class=\"cs\">public static class QueueMode\n    {       \n        public const string Default = \"default\";\n        \/\/ <summary>\n        \/\/     Leniv\u00fd re\u017eim. Leniv\u00fd re\u017eim zp\u016fsob\u00ed, \u017ee se bude uchov\u00e1vat \n        \/\/     co nejv\u00edce zpr\u00e1v na disku, aby se sn\u00ed\u017eila \n        \/\/     spot\u0159eba opera\u010dn\u00ed pam\u011bti\n        \/\/ <\/summary>\n        public const string Lazy = \"lazy\";\n    }<\/code><\/pre>\n<p><\/p>\n<pre><code class=\"cs\">ve\u0159ejn\u00e9 rozhran\u00ed IBinding\n    {\n        \/\/ &lt;shrnout&gt;\n        \/\/     V\u00fdm\u011bnn\u00fd syst\u00e9m, kter\u00fd bude spojovat vazbu\n        \/\/ &lt;\/shrnout&gt;\n        IExchange Exchange { dostat; }\n\n        \/\/ &lt;shrnout&gt;\n        \/\/     Kl\u00ed\u010d pro sm\u011brov\u00e1n\u00ed\n        \/\/ &lt;\/shrnout&gt;\n        \u0159et\u011bzec RoutingKey { dostat; }\n\n        \/\/ &lt;shrnout&gt;\n        \/\/     Nepovinn\u00e9 argumenty\n        \/\/ &lt;\/shrnout&gt;\n        IDictionary&lt;\u0159et\u011bzec, objekt&gt; Argumenty { dostat; }\n    }<\/code><\/pre>\n<p><\/p>\n<pre><code class=\"cs\">ve\u0159ejn\u00e1 t\u0159\u00edda Binding : IBinding\n    {\n        ve\u0159ejn\u00e1 t\u0159\u00edda Binding(\n             IExchange exchange, \n             \u0159et\u011bzec routingKey, \n             IDictionary&lt;\u0159et\u011bzec, objekt&gt; argumenty)\n        {\n            Exchange = exchange;\n            RoutingKey = routingKey;\n            Argumenty = argumenty;\n        }\n\n        ve\u0159ejn\u00fd IExchange Exchange { dostat; }\n        ve\u0159ejn\u00fd \u0159et\u011bzec RoutingKey { dostat; }\n        ve\u0159ejn\u00fd IDictionary&lt;\u0159et\u011bzec, objekt&gt; Argumenty { dostat; }\n    }<\/code><\/pre>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/490960\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>Queue (\u043e\u0447\u0435\u0440\u0435\u0434\u044c) \u2014 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u0434\u0438\u0441\u043a\u0435 \u0438\u043b\u0438 \u0432 \u043e\u043f\u0435\u0440\u0430\u0442\u0438\u0432\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0445\u0440\u0430\u043d\u0438\u0442 \u0441\u0441\u044b\u043b\u043a\u0438 \u043d\u0430 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f \u0438 \u043e\u0442\u0434\u0430\u0435\u0442 \u0438\u0445 \u043a\u043e\u043f\u0438\u0438 consumers (\u043f\u043e\u0442\u0440\u0435\u0431\u0438\u0442\u0435\u043b\u044f\u043c). Queue \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0441\u043e\u0431\u043e\u0439 Erlang-\u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u0441 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c (\u0433\u0434\u0435 \u043c\u043e\u0433\u0443\u0442 \u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0438 \u0441\u0430\u043c\u0438 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f). 1 \u0442\u044b\u0441\u044f\u0447\u0430 \u043e\u0447\u0435\u0440\u0435\u0434\u0435\u0439 \u043c\u043e\u0436\u0435\u0442 \u0437\u0430\u043d\u0438\u043c\u0430\u0442\u044c \u043f\u043e\u0440\u044f\u0434\u043a\u0430 80Mb. 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