Apache Camel vs. Azure Service Bus

Message brokering across different systems, with transactionality and the ability to have fine tuned control over what happens using Java (or other languages), instead of a heavy, proprietary languages. One situation that it doesn't fit very well (as far as I have experienced) is when your workflow requires significant data mapping. While possible when using Java tooling, some other visual data mapping tools in other integration frameworks are easier to work with.

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If you need a cloud-based service bus or a simple to use queue/topic/routing/pub-sub service, then Azure Service Bus is a very good choice at a reasonable price and performance. Typically on-premise we'd use RabbitMQ because it "just works", but if you're building a "cloud-first" application, then this is the one to go with. It's especially easy to integrate with if you're already embedded in the Microsoft ecosystem.

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• Camel has an easy learning curve. It is fairly well documented and there are about 5-6 books on Camel.
• There is a large user group and blogs devoted to all things Camel and the developers of Camel provide quick answers and have also been very quick to patch Camel, when bugs are reported.
• Camel integrates well with well known frameworks like Spring, and other middleware products like Apache Karaf and Servicemix.
• There are over 150 components for the Camel framework that help integrate with diverse software platforms.
• Camel is also good for creating microservices.

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• Acting as a basic queuing service it works very well.
• One of the best parts is that Azure Service Bus can work over HTTPS which helps in strict firewall situations. There is a performance hit if you choose to use HTTPS.
• The routing capabilities are quite good when using topics and subscriptions. You can apply filters using a pseudo-SQL-like language though the correlation filters are quick and easy options.
• Costs are very reasonable at low-ish volumes. If you're processing 10's of millions of messages a month... it may be a different story.

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• didn't work well when our developers tried to transform heavy data sets
• Apache Camel's whole logic is based on java so team needs to have a great skill set in java
• if there are a handful of workflows then Apache Camel's full potential can't be realized

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• The SqlFilter could be a little easier to use, but it's not terrible.
• The performance while using HTTPS for the connection is a little slow compared to direct connections using AMQP ports.
• There is a size limit to the message - unlike RMQ for instance, Azure Service Bus caps messages to 256kb on the standard tier.

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If you are looking for a Java-based open source low cost equivalent to webMethods or Azure Logic Apps, Apache Camel is an excellent choice as it is mature and widely deployed, and included in many vendored Java application servers too such as Redhat JBoss EAP. Apache Camel is lacking on the GUI tooling side compared to commercial products such as webMethods or Azure Logic Apps.

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RabbitMQ is simple and awesome... but so is Azure Service Bus. Both accomplish the same thing but in different environments. If you're building a cloud-native application - especially one that is serverless by design - Azure Service Bus is the only real choice in Azure. It works well, it's performance, and it's reasonably priced in the Standard tier. From our testing, RMQ is more performant, but it's hard to compare service-based implementations vs RMQ installed on VMs.

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• Very fast time to market in that so many components are available to use immediately.
• Error handling mechanisms and patterns of practice are robust and easy to use which in turn has made our application more robust from the start, so fewer bugs.
• However, testing and debugging routes is more challenging than working is standard Java so that takes more time (less time than writing the components from scratch).
• Most people don't know Camel coming in and many junior developers find it overwhelming and are not enthusiastic to learn it. So finding people that want to develop/maintain it is a challenge.

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• Compared to open-source free software like RMQ, Azure Service Bus does have some costs to it. But the cost is reasonable.
• Also unlike RMQ, Azure Service Bus doesn't require you to stand up any hardware - so it's very easy to use and saves time/money from that perspective.

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