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SUBSCRIBE, UNSUBSCRIBE and PUBLISHimplement the Publish/Subscribe messagingparadigm where(citing Wikipedia) senders (publishers) are not programmed to sendtheir messages to specific receivers (subscribers). Rather, publishedmessages are characterized into channels, without knowledge of what (ifany) subscribers there may be. Subscribers express interest in one ormore channels, and only receive messages that are of interest, withoutknowledge of what (if any) publishers there are. This decoupling ofpublishers and subscribers can allow for greater scalability and a moredynamic network topology.
A client subscribed to one or more channels should not issue commands,although it can subscribe and unsubscribe to and from other channels.The replies to subscription and unsubscribing operations are sent inthe form of messages, so that the client can just read a coherentstream of messages where the first element indicates the type ofmessage. The commands that are allowed in the context of a subscribedclient are SUBSCRIBE, SSUBSCRIBE, SUNSUBSCRIBE, PSUBSCRIBE, UNSUBSCRIBE, PUNSUBSCRIBE, PING, RESET, and QUIT.
Please note that when using redis-cli, in subscribed modecommands such as UNSUBSCRIBE and PUNSUBSCRIBE cannot be used becauseredis-cli will not accept any commands and can only quit the mode with Ctrl-C.
unsubscribe: means that we successfully unsubscribed from thechannel given as second element in the reply. The third argumentrepresents the number of channels we are currently subscribed to. Whenthe last argument is zero, we are no longer subscribed to any channel,and the client can issue any kind of Redis command as we are outside thePub/Sub state.
message: it is a message received as result of a PUBLISH commandissued by another client. The second element is the name of theoriginating channel, and the third argument is the actual messagepayload.
Similarly to SUBSCRIBE and UNSUBSCRIBE, PSUBSCRIBE andPUNSUBSCRIBE commands are acknowledged by the system sending a messageof type psubscribe and punsubscribe using the same format as thesubscribe and unsubscribe message format.
A client may receive a single message multiple times if it's subscribedto multiple patterns matching a published message, or if it issubscribed to both patterns and channels matching the message. Like inthe following example:
In subscribe, unsubscribe, psubscribe and punsubscribemessage types, the last argument is the count of subscriptions stillactive. This number is actually the total number of channels andpatterns the client is still subscribed to. So the client will exitthe Pub/Sub state only when this count drops to zero as a result ofunsubscribing from all the channels and patterns.
From 7.0, sharded Pub/Sub is introduced in which shard channels are assigned to slots by the same algorithm used to assign keys to slots.A shard message must be sent to a node that own the slot the shard channel is hashed to.The cluster makes sure the published shard messages are forwarded to all nodes in the shard, so clients can subscribe to a shard channel by connecting to either the master responsible for the slot, or to any of its replicas.SSUBSCRIBE, SUNSUBSCRIBE and SPUBLISH are used to implement sharded Pub/Sub.
Because all the messages received contain the original subscriptioncausing the message delivery (the channel in the case of message type,and the original pattern in the case of pmessage type) client librariesmay bind the original subscription to callbacks (that can be anonymousfunctions, blocks, function pointers), using a hash table.
Change notifications enable you to subscribe to changes (create, update, and delete) to messages in a channel or chat. Change notifications provide a low latency model by allowing you to maintain a subscription. You can also get the resource data in the notifications and therefore avoid calling the API to get the payload.
To track all changes related to messages in a tenant, you can use subscriptions at a tenant level for channel and chat messages. This requires you to create two subscriptions: one to track all messages across channels, and one to track all messages across chats.
To track messages and replies in a channel, you can create a change notification subscription at a channel level. To do this, subscribe to /teams/{team-id}/channels/{channel-id}/messages. This resource supports including resource data in the notification in both delegated and application-only mode.
To track messages in a chat, you can create a change notification subscription at a chat level. To do this, subscribe to /chats/{chat-id}/messages. This resource supports including resource data in the notification in both delegated and application-only mode.
To track messages across all chats a particular user is part of, you can create a change notification subscription at a user level. To do this, subscribe to /users/{user-id}/chats/getAllMessages. This resource supports including resource data in the notification in both delegated and application-only modes.
To get change notifications for all messages across chats in a tenant where a specific Teams app is installed, subscribe to /appCatalogs/teamsApps/{teams-app-id}/installedToChats/getAllMessages. This resource supports including resource data in the notification.
Once the client enters the subscribed state it is not supposed to issue anyother commands, except for additional SUBSCRIBE, SSUBSCRIBE, PSUBSCRIBE, UNSUBSCRIBE, SUNSUBSCRIBE,PUNSUBSCRIBE, PING, RESET and QUIT commands.However, if RESP3 is used (see HELLO) it is possible for a client to issue any commands while in subscribed state.
When successful, this command doesn't return anything.Instead, for each channel, one message with the first element being the string \"subscribe\" is pushed as a confirmation that the command succeeded.
A Publish-Subscribe Channel works like this: It has one input channel that splits into multiple output channels, one for each subscriber. When an event is published into the channel, the Publish-Subscribe Channel delivers a copy of the message to each of the output channels. Each output channel has only one subscriber, which is only allowed to consume a message once. In this way, each subscriber only gets the message once and consumed copies disappear from their channels.
A Publish-Subscribe Channel can be a useful debugging tool. Even though a message is destined to only a single receiver, using a Publish-Subscribe Channel allows you to eavesdrop on a message channel without disturbing the existing message flow. Monitoring all traffic on a channel can be tremendously helpful when debugging messaging applications. It can also save you from inserting a ton of print statements into each application that participates in the messaging solution. Creating a program that listens for messages on all active channels and logs them to a file can realize many of the same benefits that a Message Store brings.
Subscriptions are identified by a name and a topic so multiple subscribers can compete for messages off the same subscription or create individual subscriptions for the same topic. If a subscription already exists, the underlying REST API throws an exception, which we can simply ignore.
It is best that you do not have two or more flows using a source that listens to events on the same channel or topic because the events will be consumed twice from your user quota. If you have a use case that requires processing the same events in two or more different flows, consider implementing that logic in a single flow instead.
Users can push events to a streaming channel, even if the channel does not have a listener for reading published events. Once a listener is started for the channel, Salesforce Streaming API pushes as many messages it can to the listener, based on the maximum daily limit.
For example, given that the maximum number of delivered event notifications within a 24-hour period for a free Salesforce organization is 10,000, suppose you publish 15,000 events to that channel. When Salesforce Connector subscribes to that channel, the Streaming API attempts to push 10,000 events, thus consuming the daily quota. The API will then attempt to push the remaining 5,000 events the next day before pushing any new events.
You can also create a streaming channel by using either the connector Create operation or the connector Publish streaming channel (publish-streaming-channel) operation. The following example uses the publish-streaming-channel operation:
To subscribe to a topic, add the Subscribe topic listener (subscribe-topic-listener) or Replay topic listener (replay-topic-listener) as an input source for your flow. The input source acts as an inbound endpoint. Every time the subscription receives an event, the input source executes the rest of the flow in your Mule app.
Salesforce stores events for 24 hours (or 72 hours for high-volume events). A subscriber to a topic or channel can retrieve events related to that topic or channel during the 24-hour retention window. After the retention window ends, the subscriber can retrieve newer events that have not yet expired. 59ce067264
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