Vaclav Kosar vackosar

Spring integration RouterSpec functions subflowMapping VS channelMapping

I find it unintuitive that two seemingly similar functions subFlowMapping and channelMapping are very different. The difference is not mentioned in the Javadoc. Difference is described in release announcement.

Quote

The channelMapping() continues to work as in regular Router mapping, but the subFlowMapping() tied that subflow with main flow. In other words, any router’s subflow returns to the main flow after .route().

Git Review

Git has indeed many nice features.

I really like ability to - compile readable commit history (git rebase) - review code with pull request review

Resolve Issues Installing LUbuntu Into VirtualBox.

Encoutered couple of issues.

Turn swap off before starting installation to install with full disk encryption.

  sudo swapoff --all

Download essentials before installing VirtualBox Additions.

  sudo apt-get update
  sudo apt-get install build-essential linux-headers-"$(uname -r)"
  # sudo apt-get install virtualbox-guest-*

Change owner of linux mounted directory

Remount the directory. Oridinary "chown" won't work.

Print contents of a Java collection.

   Arrays.deepToString(collection.toArray());

	Spring Singleton corresponds to either
	- JEE stateless session bean
	- or if it has internal state to JEE singleton

	Spring Prototype corresponds to JEE stateful session bean.

	Spring Scopes Session and Request correspond to CDI Scoped beans. However CDI does not support transactions in contrast to Spring Beans or JEE beans.

	DSL configuration has all relevant information colocated on one place in the code.
	XML configuration has information scattered. Part is in the XML and part in the code.


	DSL CONFIGURATION EXAMPLE

	.<OrderItem, Boolean>route(OrderItem::isIced, mapping -> mapping // 16
	.subFlowMapping("true", routeIced())// 24
	.subFlowMapping("false", routeNotIced()))

	I cannot extract objects from lambda expressions. I cannot say that Eclipse has full support of Java 8.


	EXAMPLE

	x -> x.toString()

	cannot be extracted to

	Function<Object, String> ToStringFuction ...

	Spring compared to JEE is much more complex and configurable. Spring also has kind of organic-growth feel. This is why I currently still prefer JEE.

	http://www.mkyong.com/tutorials/spring-tutorials/