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I am building a messaging app.I found technology needed are MQTT or RabbitMQ. To me both seems doing the same thing in the same way (in terms of subscribing & publishing to a topic).
So basically what is the main difference between these two and what are the advantage of each on other?
That's not really a valid comparison, one is a protocol and the other is an implementation of that protocol
RabbitMQ is a message broker that supports multiple messaging protocols including MQTT, AMQP, STOMP via a plugin architecture
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Is there any framework/tool which can provide Embedded Kafka instance (Kafka Brokers) without any dependency of spring in Java/Scala?
Can someone please provide a working example of it?
You have several options.
Check out the samples on Confluent examples repo, they use embedded instances of Kafka, ZooKeeper, and Confluent Schema Registry (an example: https://github.com/confluentinc/kafka-streams-examples/blob/65f770c75988afc33d3813a1aa4f9f7818fe81d8/src/test/java/io/confluent/examples/streams/WikipediaFeedAvroExampleTest.java#L51)
TestContainers might be another alternative.
Citrus has also support for that.
If you are using Scala, check out the Embedded Kafka library
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I am looking for an opensource/free load testing tool to test applications over RMI.
I only know the JMeter plugin "JMeter RMI Sampler", but I am looking for another one.
You can try The Grinder, a Java Load Testing Framework.
The Grinder 3 is both open-source and supports RMI protocol:
The Grinder can be used to test RPC and MOM based systems using
protocols such as IIOP, RMI/IIOP, RMI/JRMP, and JMS.
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I am looking for any good Socket library with events for Java. Mainly it should be used for client development. Server side is already finished (in other language).
Thank you very much.
It seems that the best one is jBoss Netty
The Netty project is an effort to provide an asynchronous event-driven
network application framework and tools for rapid development of
maintainable high performance & high scalability protocol servers &
clients.
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I am looking for a RPC stack that can be used between a Java Server and C++ clients.
My requirements are:
Ease of integration (for both C++ and Java)
Performance, especially number of concurrent connections and response time. Payload are mostly binaries (8-100kb)
I found some like:
http://code.google.com/p/protobuf-socket-rpc/
http://code.google.com/p/netty-protobuf-rpc/
Are there any other good alternatives?
Thrift might be worth investigating.
I used to worked with protocol buffer and I was very satisfied. It's really very, very fast.
And You can easy integrate it with Java and C++.
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I want to make an application that can send an SMS to person in another country.
I have heard that using an international SMS gateway is the best way to do it, and is cheap (possibly even free).
What is the best library for achieving this?
There are a couple of options:
1) Use a java library such as smslib, which allows direct communication with a mobile phone modem to send or receive messages.
2) Register with one of the SMS gateway providers such as Clickatell or csoft and use their supplied apis. I would start by looking at the HTTP api here and here.
A number of similar previous questions have covered this topic:
Programmatic SMS
How do I implement an SMS service?
Sending SMS