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Spring Batch - Validate Header Lines in input csv file and skip the file if it invalidates

人盡茶涼 提交于 2019-11-30 18:54:52
问题 I have a simple job as below: <batch:step id="step"> <batch:tasklet> <batch:chunk reader="itemReader" processor="itemProcessor" writer="itemWriter" commit- interval="5000" /> </batch:tasklet> </batch:step> itemReader is as below: <bean id="itemReader" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step"> <property name="linesToSkip" value="1"></property> <property name="skippedLinesCallback" ref="skippedLinesCallback" ></property> <property name="lineMapper"> <bean

Optimize LINQ for IList

狂风中的少年 提交于 2019-11-30 03:10:56
问题 A while ago I wrote an IList extension method to enumerate across part of a list by using the indices. While refactoring I realized a similar query could be performed by calling Skip(toSkip).Take(amount) . While benchmarking this I noticed that Skip isn't optimized for IList . With a bit of googling I ended up at a Jon Skeet post, discussing why optimizing methods like Skip is dangerous. As far as I understand the article, the problem is no exception is thrown in the optimized methods when

How do you skip a unit test in Django?

拈花ヽ惹草 提交于 2019-11-30 01:07:19
How do forcibly skip a unit test in Django? @skipif and @skipunless is all I found, but I just want to skip a test right now for debugging purposes while I get a few things straightened out. Ray Toal Python's unittest module has a few decorators: There is plain old @skip : from unittest import skip @skip("Don't want to test") def test_something(): ... If you can't use @skip for some reason, @skipIf should work. Just trick it to always skip with the argument True : @skipIf(True, "I don't want to run this test yet") def test_something(): ... unittest docs Docs on skipping tests If you are

Copy all cells with certain value into another column skipping blanks

社会主义新天地 提交于 2019-11-29 11:01:00
I have three columns, A, B and C: Column A contains names, NAME1, NAME2, etc. Column B contains only the values "YES" or "NO". Column C is suppose to contain the names from column A that have value "YES" in column B. I can say that as long as the value is "YES" in column B, copy the value from column A to column C. Very simple with: C1=IF(B1="YES",A1,"") But this will include blank cells, which I don't want to. So I guess I am looking for a way to copy all the names from column A with value "YES" in column B and paste them into column C skipping the blanks. I did find a VBA project that colors

How is the skipping implemented in Spring Batch?

家住魔仙堡 提交于 2019-11-29 03:58:14
I was wondering how I could determine in my ItemWriter , whether Spring Batch was currently in chunk-processing-mode or in the fallback single-item-processing-mode. In the first place I didn't find the information how this fallback mechanism is implemented anyway. Even if I haven't found the solution to my actual problem yet, I'd like to share my knowledge about the fallback mechanism with you. Feel free to add answers with additional information if I missed anything ;-) The implementation of the skip mechanism can be found in the FaultTolerantChunkProcessor and in the RetryTemplate . Let's

How do you skip a unit test in Django?

旧城冷巷雨未停 提交于 2019-11-28 21:49:48
问题 How do forcibly skip a unit test in Django? @skipif and @skipunless is all I found, but I just want to skip a test right now for debugging purposes while I get a few things straightened out. 回答1: Python's unittest module has a few decorators: There is plain old @skip : from unittest import skip @skip("Don't want to test") def test_something(): ... If you can't use @skip for some reason, @skipIf should work. Just trick it to always skip with the argument True : @skipIf(True, "I don't want to

Java 8 Stream: difference between limit() and skip()

百般思念 提交于 2019-11-28 05:37:21
Talking about Stream s, when I execute this piece of code public class Main { public static void main(String[] args) { Stream.of(1,2,3,4,5,6,7,8,9) .peek(x->System.out.print("\nA"+x)) .limit(3) .peek(x->System.out.print("B"+x)) .forEach(x->System.out.print("C"+x)); } } I get this output A1B1C1 A2B2C2 A3B3C3 because limiting my stream to the first three components forces actions A , B and C to be executed only three times. Trying to perform an analogous computation on the last three elements by using skip() method, shows a different behaviour: this public class Main { public static void main

Copy all cells with certain value into another column skipping blanks

妖精的绣舞 提交于 2019-11-28 04:08:37
问题 I have three columns, A, B and C: Column A contains names, NAME1, NAME2, etc. Column B contains only the values "YES" or "NO". Column C is suppose to contain the names from column A that have value "YES" in column B. I can say that as long as the value is "YES" in column B, copy the value from column A to column C. Very simple with: C1=IF(B1="YES",A1,"") But this will include blank cells, which I don't want to. So I guess I am looking for a way to copy all the names from column A with value

C# why is it skipping my console.readline()?

巧了我就是萌 提交于 2019-11-28 02:24:42
So the program is working correctly, but for some reason, on the second time through, it is skipping the Console.ReadLine() prompt altogether. I ran through debug and confirmed that it isn't a loop problem as it is actually entering the method, displaying the WriteLine then completely skipping over the ReadLine, thus returning a blank back to Main() causing it to exit. What the deuce? Any ideas? here is the code. using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Text; namespace LAB4B { class Program { static void Main(string[] args) {

Maven - skip parent project build

一世执手 提交于 2019-11-28 00:42:01
I know it's mauvais ton to ask twice in a single day but here's another Maven puzzler: I have a parent POM which defines 5 modules (5 subprojects). Since each module is executed in exactly the same way I pull <profile><build> section into the parent POM to get rid of the duplicate code. Now - if I execute build individually from each module it works, however if I want to build all modules at once and move to the parent directory I got error since the very first thing Maven tries to execute is the parent project itself: mvn package -P release [INFO] Scanning for projects... [INFO] Reactor build