Shulou(Shulou.com)06/03 Report--

Workflow engine is a very important part of software development. The so-called workflow engine means that workflow, as a part of the application system, provides core solutions such as information transmission routing, content level and so on, which play a decisive role in each application system according to different roles, division of labor and conditions.

Workflow engine includes important functions such as process node management, flow direction management, process sample management and so on.

To develop an excellent software system, the system interface is the most basic part, the exchange of information between databases is a necessary condition, and according to business requirements to develop practical program logic, and to a certain extent to ensure its stability, maintainability is fundamental. Stability needless to say, maintainability should be modular and structured, so that it can generate new business logic when business processes change, such as changes in decision-making rights and organizational structures. and the workflow engine solves this problem. If the application lacks a strong logic layer, it will become error-prone, such as information routing errors, endless loops, and so on.

To take a simple example, a car looks beautiful, but if there is something wrong with the engine, it becomes a decoration and is bound to bug constantly. The expansibility of the application system is like the engine speed of a car. It takes only 10 seconds for others to accelerate 100 kilometers, while yours takes an hour (business process changes take longer to modify). And who would applaud such a car if the engine stalled all the time (the program logic loop)?

Service architecture

Service-oriented architecture is a component model that connects different functional units of an application through well-defined interfaces and contracts between these services. Interfaces are defined in a neutral manner and should be independent of the hardware platform, operating system, and programming language that implements the service. The workflow engine enables services built in various such systems to interact in a unified and universal way.

Learun Workflow engine

In the past, I have been thinking about how to build a flexible OA workflow mechanism. at first, many people use domino to do it, and then when they come to ASP.NET, everyone seems to wake up, and the company boss, CTO and so on all begin to clamour to use the workflow engine to realize the enterprise information approval process. Based on the actual needs of enterprises, the company has also developed a standard enterprise-level workflow engine (learun) in recent years, and obtained double soft certification, all indicators and customer responses are good, the basic ideas are as follows:

First of all, define each operation, that is, define the process step, which mainly includes: the interface address of the operation, operation parameters, operation type (initial operation, intermediate operation, etc.). The purpose of defining actions is to then select these defined steps when setting up relationships and defining processes for each operation.

Second, define the parameters of the operation. In addition to the interface address, you also need to define the operation parameters.

The third is to define the relationship between operation steps. Is to define the precursor and subsequent steps of each operation step in a process.

The fourth is to define the process, the necessary information is the basic information such as the process name and define the various operation steps of the process as well as the flow rules. Needless to say, the basic information of the process. The definition of process steps is complex, setting and defining step types (start, middle, and end), entry steps, exit steps, notification mode, personnel, roles, and the content of sending notifications.

The fifth is the definition of jump step, for example, it needs to be submitted to different steps for approval according to different parameters, which is called process step change rule setting. The content of the setting needs to be: the original step, the target step, the direction of change (positive / negative), and the conditional rule (to determine whether to use or to use). Then set parameters and parameter values and compare conditions.

The sixth is authorization management. This is relatively simple, to determine whether the person being submitted is in an authorized state, so as to carry out authorization processing.

The above is only the basic logic, the actual preparation process should also consider the actual situation of each enterprise, learun framework built-in workflow engine, a collection of customer opinions and suggestions of various industries, strong applicability, high stability, easy to use, welcome to experience correction.

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