Message Bus A Message Bus is a messaging infrastructure to allow different systems to communicate through a shared set of interfaces(message bus). Source: EIP Message Queue The basic idea of a message queue is a simple one: Two (or more) processes can exchange information via access to a common system message queue. The sending process … Read more
Remember that while JavaScript is single-threaded, all of node’s I/O and calls to native APIs are either asynchronous (using platform-specific mechanisms), or run on a separate thread. (This is all handled through libuv.) So when there’s data available on a socket or a native API function has returned, we need a synchronized way to invoke … Read more
A Looper is a message handling loop: it reads and processes items from a MessageQueue. The Looper class is usually used in conjunction with a HandlerThread (a subclass of Thread). A Handler is a utility class that facilitates interacting with a Looper—mainly by posting messages and Runnable objects to the thread’s MessageQueue. When a Handler … Read more
Theoretically anything can be stored/sent as a message. You actually don’t want to store anything on the queues. The system works most efficiently if the queues are empty most of the time. You can send anything you want to the queue with two preconditions: The thing you are sending can be converted to and from … Read more
You are right, you don’t need Celery at all. When you are designing a distributed system there are a lot of options and there is no right way to do things that fits all situations. Many people find that it is more flexible to have pools of message consumers waiting for a message to appear … Read more
you could use redis with the lightning fast node_redis client. It even has built-in pubsub semantics.
Kafka uses the abstraction of a distributed log that consists of partitions. Splitting a log into partitions allows to scale-out the system. Keys are used to determine the partition within a log to which a message get’s appended to. While the value is the actual payload of the message. The examples are actually not very … Read more
Your question is a bit messy but Let’s see its bits one by one. General concept: The Java Message Service (JMS) API is a Java Message Oriented Middleware (MOM) API for sending messages between two or more clients. JMS is a part of the Java Platform, Enterprise Edition, and is defined by a specification developed … Read more
Here the simplest algorithm, if you want just to drop messages when they arrive too quickly (instead of queuing them, which makes sense because the queue might get arbitrarily large): rate = 5.0; // unit: messages per = 8.0; // unit: seconds allowance = rate; // unit: messages last_check = now(); // floating-point, e.g. usec … Read more
JMS (ActiveMQ is a JMS broker implementation) can be used as a mechanism to allow asynchronous request processing. You may wish to do this because the request take a long time to complete or because several parties may be interested in the actual request. Another reason for using it is to allow multiple clients (potentially … Read more