What is Azure Service Bus?
- Microsoft Azure Service Bus is a reliable information delivery service.
- The main agenda is to make the communication easier.
- When two or more parties want to exchange information, they need a communication facilitator.
- Service Bus is a brokered, or third-party communication mechanism.
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Azure Service Bus: Concept
Azure service bus is a multi- tenant cloud service. multiple users share the services. The application developer who creates a namespace, then defines the communication mechanisms needed within that namespace.

Azure Service Bus Fundamentals
Queues
- Queues allows one way communication.
- Each queue acts a broker that stores sent messages until they are
- A single recipient receives every single message.
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Topics
- The Topics help in one-way communication
- The Topic is similar to a broker, but they also help you to filter the received message to match the specific criteria
Relays
- Relays provide bi-directional communication.
- When compared to queues and topics relays don’t act like a broker.
- Instead, it just passes them on to the destination application.

Azure Service Bus: Queues
When the user decides to connect two application is using a Service Bus queue. The process is carried out when the sender sends a message to a Service Bus Queue and a receiver picks up the message at some point of time. It is to be noted that a queue can have just a single receiver.
- Every individual message has two parts
- A set of properties each of which is a key and a message payload.
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A receiver can read the message from a Service Bus queue in two different ways
- Receive & delete: Receives a message from the queue and deletes it immediately
- Peek Lock : It removes the message from the queue, it does not delete the message instead it locks the message making it invisible to other
Azure Service Bus: Relay
- A one- way asynchronous communication is provided by both queues and topics through a broker.
- In a relay there the traffic flows in just one direction and there is no direct connection between senders and receivers.
- You don’t need a broker to store a message when your application needs to both send and receive messages
Azure Service Bus:Standard vs Premium Messaging
Premium |
Standard |
High throughput |
Variable throughput |
Predictable performance |
Variable latency |
Fixed  pricing |
Pay as you go variable pricing |
Ability to scale workload up and down |
N/A |
Message size up to 1 MB |
Message size up to 256 KB |
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