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<< Click to Display Table of Contents >> Custom Derivative Task |
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This chapter describes the timing task interface for importing custom market data, the related methods and inputs and outputs, and the precautions when calling. The simple data import class SimpleImportTask. is defined, and some interfaces are developed to extend the data import behavior. To execute this custom Mart data import task, we need to start the product.
❖Method description
Rewrite method |
import |
export |
describe |
|---|---|---|---|
getFolder(TaskContext context) |
Context task execution context |
String specifies the folder name to enter the market |
The default is obtained from the parameter folder setting value, which is called at the beginning of task execution |
getFilePrefix(TaskContext context) |
Context task execution context |
String indicates the file name prefix to enter the market |
Acquirement from the parameter file setting value is called at the beginning of the task execution. |
isAppend(TaskContext context) |
Context task execution context |
Boolean indicates whether to enter the market in appended mode |
The default is obtained from the parameter append setting value, which is called at the beginning of task execution |
getParams() |
无 |
Parameter [] Parameters used for task execution |
This method is used only when parameters are collected, and the runtime is not called to the |
getMeta() |
Context task execution context |
Map<String, Object> Returns the meta value expected to be set on the market file |
Returns nullby default, which is called when the task is executed, noting that key is the meta name, value is the Object, preferably of a regular type |
getGrid（TaskContext context） |
Context task execution context |
DataGrid Return grid data |
The default is to obtain data by executing the query selected when the task is defined, which can be overridden and called when the task is executed |
❖Call Description :
Inheritable SimpleImportTask class, overrides the above open method to complete the established derivative task, currently has only made the implementation to the function level, the performance aspect has not carried on the enhancement temporarily, but the subsequent performance enhancement will not affect the interface call change, It's just a modification inside the SimpleImportTask class.
Select a custom task in the scheduled task, write a new custom class name, collect parameters, there are now three default parameters folder, file, append table name into the market's folder name, the file prefix into the market, whether Append mode (write true, false string).