We Keep Coding

Guaranteed to run function before AWS lambda exits

Is there a way in the JVM to guarantee that some function will run before a AWS lambda function will exit? I would like to flush an internal buffer to stdout as a last action in a lambda function even if some exception is thrown.

As far as I understand you want to execute some code before your Lambda function is stopped, regardless what your execution state is (running/waiting/exception handling/etc).
This is not possible out of the box with Lambda, i.e. there is no event fired or something similar which can be identified as a shutdown hook. The JVM will be freezed as soon as you hit the timeout. However, you can observe the remaining execution time by using the method getRemainingTimeInMillis() from the Context object. From the docs:
Returns the number of milliseconds left before the execution times out.
So, when initializing your function you can schedule a task which is regularly checking how much time is left until your Lambda function reaches the timeout. Then, if only less than X (milli-)seconds are left, you do Y.

aws-samples shows how to do it here
package helloworld;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
/**
* Handler for requests to Lambda function.
*/
public class App implements RequestHandler<Object, Object> {
static {
Runtime.getRuntime().addShutdownHook(new Thread() {
#Override
public void run() {
System.out.println("[runtime] ShutdownHook triggered");
System.out.println("[runtime] Cleaning up");
// perform actual clean up work here.
try {
Thread.sleep(200);
} catch (Exception e) {
System.out.println(e);
}
System.out.println("[runtime] exiting");
System.exit(0);
}
});
}
public Object handleRequest(final Object input, final Context context) {
Map<String, String> headers = new HashMap<>();
headers.put("Content-Type", "application/json");
headers.put("X-Custom-Header", "application/json");
try {
final String pageContents = this.getPageContents("https://checkip.amazonaws.com");
String output = String.format("{ \"message\": \"hello world\", \"location\": \"%s\" }", pageContents);
return new GatewayResponse(output, headers, 200);
} catch (IOException e) {
return new GatewayResponse("{}", headers, 500);
}
}
private String getPageContents(String address) throws IOException {
URL url = new URL(address);
try (BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()))) {
return br.lines().collect(Collectors.joining(System.lineSeparator()));
}
}
}

How to integrate karate with testrail

I am new to Java and using karate for API automation. I need help to integrate testrail with karate. I want to use tags for each scenario which will be the test case id (from testrail) and I want to push the result 'after the scenario'.
Can someone guide me on this? Code snippets would be more appreciated. Thank you!

I spent a lot of effort for this.
That's how I implement. Maybe you can follow it.
First of all, you should download the APIClient.java and APIException.java files from the link below.
TestrailApi in github
Then you need to add these files to the following path in your project.
For example: YourProjectFolder/src/main/java/testrails/
In your karate-config.js file, after each test, you can send your case tags, test results and error messages to the BaseTest.java file, which I will talk about shortly.
karate-config.js file
function fn() {
var config = {
baseUrl: 'http://111.111.1.111:11111',
};
karate.configure('afterScenario', () => {
try{
const BaseTestClass = Java.type('features.BaseTest');
BaseTestClass.sendScenarioResults(karate.scenario.failed,
karate.scenario.tags, karate.info.errorMessage);
}catch(error) {
console.log(error)
}
});
return config;
}
Please dont forget give tag to scenario in Feature file.
For example #1111
Feature: ExampleFeature
Background:
* def conf = call read('../karate-config.js')
* url conf.baseUrl
#1111
Scenario: Example
Next, create a runner file named BaseTests.java
BaseTest.java file
package features;
import com.intuit.karate.junit5.Karate;
import net.minidev.json.JSONObject;
import org.junit.jupiter.api.BeforeAll;
import testrails.APIClient;
import testrails.APIException;
import java.io.IOException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
public class BaseTest {
private static APIClient client = null;
private static String runID = null;
#BeforeAll
public static void beforeClass() throws Exception {
String fileName = System.getProperty("karate.options");
//Login to API
client = new APIClient("Write Your host, for example
https://yourcompanyname.testrail.io/");
client.setUser("user.name#companyname.com");
client.setPassword("password");
//Create Test Run
Map data = new HashMap();
data.put("suite_id", "Write Your Project SuitId(Only number)");
data.put("name", "Api Test Run");
data.put("description", "Karate Architect Regression Running");
JSONObject c = (JSONObject) client.sendPost("add_run/" +
TESTRAİL_PROJECT_ID, data);
runID = c.getAsString("id");
}
//Send Scenario Result to Testrail
public static void sendScenarioResults(boolean failed, List<String> tags, String errorMessage) {
try {
Map data = new HashMap();
data.put("status_id", failed ? 5 : 1);
data.put("comment", errorMessage);
client.sendPost("add_result_for_case/" + runID + "/" + tags.get(0),
data);
} catch (IOException e) {
e.printStackTrace();
} catch (APIException e) {
e.printStackTrace();
}
}
#Karate.Test
Karate ExampleFeatureRun() {
return Karate.run("ExampleFeatureRun").relativeTo(getClass());
}
}

Please look at 'hooks' documented here: https://github.com/intuit/karate#hooks
And there is an example with code over here: https://github.com/intuit/karate/blob/master/karate-demo/src/test/java/demo/hooks/hooks.feature
I'm sorry I can't help you with how to push data to testrail, but it may be as simple as an HTTP request. And guess what Karate is famous for :)
Note that values of tags can be accessed within a test, here is the doc for karate.tagValues (with link to example): https://github.com/intuit/karate#the-karate-object
Note that you need to be on the 0.7.0 version, right now 0.7.0.RC8 is available.
Edit - also see: https://stackoverflow.com/a/54527955/143475

Exception while calling Parser method outside main class

In my application I have a method which I cant execute without main method. It only runs inside the main method. When I call that method inside my servlet class. It show an exception
My class with Main Method
package com.books.servlet;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.util.HashSet;
import java.util.Set;
import opennlp.tools.cmdline.parser.ParserTool;
import opennlp.tools.parser.Parse;
import opennlp.tools.parser.Parser;
import opennlp.tools.parser.ParserFactory;
import opennlp.tools.parser.ParserModel;
public class ParserTest {
// download
public void download(String url, File destination) throws IOException, Exception {
URL website = new URL(url);
ReadableByteChannel rbc = Channels.newChannel(website.openStream());
FileOutputStream fos = new FileOutputStream(destination);
fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
fos.close();
rbc.close();
}
public static Set<String> nounPhrases = new HashSet<>();
private static String line = "The Moon is a barren, rocky world ";
public void getNounPhrases(Parse p) {
if (p.getType().equals("NN") || p.getType().equals("NNS") || p.getType().equals("NNP")
|| p.getType().equals("NNPS")) {
nounPhrases.add(p.getCoveredText());
}
for (Parse child : p.getChildren()) {
getNounPhrases(child);
}
}
public void parserAction() throws Exception {
// InputStream is = new FileInputStream("en-parser-chunking.bin");
File modelFile = new File("en-parser-chunking.bin");
if (!modelFile.exists()) {
System.out.println("Downloading model.");
download("https://drive.google.com/uc?export=download&id=0B4uQtYVPbChrY2ZIWmpRQ1FSVVk", modelFile);
}
ParserModel model = new ParserModel(modelFile);
Parser parser = ParserFactory.create(model);
Parse topParses[] = ParserTool.parseLine(line, parser, 1);
for (Parse p : topParses) {
// p.show();
getNounPhrases(p);
}
}
public static void main(String[] args) throws Exception {
new ParserTest().parserAction();
System.out.println("List of Noun Parse : " + nounPhrases);
}
}
It gives me below output
List of Noun Parse : [barren,, world, Moon]
Then I commented the main method and. Called the ParserAction() method in my servlet class
if (name.equals("bkDescription")) {
bookDes = value;
try {
new ParserTest().parserAction();
System.out.println("Nouns Are"+ParserTest.nounPhrases);
} catch (Exception e) {
}
It gives me the below exceptions
And below error in my Browser
Why is this happening ? I can run this with main method. But when I remove main method and called in my servlet. it gives an exception. Is there any way to fix this issue ?
NOTE - I have read below instructions in OpenNLP documentation , but I have no clear idea about it. Please help me to fix his issue.
Unlike the other components to instantiate the Parser a factory method
should be used instead of creating the Parser via the new operator.
The parser model is either trained for the chunking parser or the tree
insert parser the parser implementation must be chosen correctly. The
factory method will read a type parameter from the model and create an
instance of the corresponding parser implementation.

Either create an object of ParserTest class or remove new keyword in this line new ParserTest().parserAction();

Run ms-access function using jacob - Run-time error 3073 Updateable Query - Opened it read-only

I'm attempting to run an Access function through Java using Jacob using Application.Run (https://msdn.microsoft.com/en-us/library/office/ff193559.aspx). I am able to open and close an Access database, but not run a function. I suspect the run call actually does go through but that I have opened the file read-only (maybe? not sure I did) which then causes the Access error: Run-time error 3073: Operation must use an updatable query. The query simply appends two strings onto a test table I created, and that query works by hand, but so far not through Java.
If the error is that I've opened it read-only, how can I open it not read-only? If it's something else, how do I call a function (or a macro, either will work) using Jacob? Or you may know some other Java technique besides using Jacob, I'd take that too.
Minimum example:
Java program
import com.jacob.activeX.ActiveXComponent;
import com.jacob.com.ComThread;
import com.jacob.com.Dispatch;
import com.jacob.com.LibraryLoader;
import com.jacob.com.Variant;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
* #author evans
*/
public class Test {
public static void main(String[] args) {
// Load library/.dll
try {
String libFile = System.getProperty("os.arch").equals("amd64") ? "jacob-1.18-x64.dll" : "jacob-1.18-x86.dll";
FileInputStream inputStream = new FileInputStream(new File(libFile));
File temporaryDll = File.createTempFile("jacob", ".dll");
try (FileOutputStream outputStream = new FileOutputStream(temporaryDll)) {
byte[] array = new byte[8192];
for (int i = inputStream.read(array); i != -1; i = inputStream.read(array)) {
outputStream.write(array, 0, i);
}
}
System.setProperty(LibraryLoader.JACOB_DLL_PATH, temporaryDll.getAbsolutePath());
LibraryLoader.loadJacobLibrary();
temporaryDll.deleteOnExit();
} catch (IOException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
}
// Open thread
ComThread.InitSTA(true);
// New application
ActiveXComponent ComBridge = new ActiveXComponent("Access.Application");
// Open database
Dispatch.put(ComBridge, "Visible", new Variant(true));
ComBridge.invoke("OpenCurrentDatabase", new Variant("C:/Users/evans/Documents/Book Business/Building Reports/Book Business.accdb"));
// Run function
ComBridge.invoke("Run", new Variant("Test"));
// Shutdown
ComBridge.invoke("Quit");
ComThread.quitMainSTA();
ComThread.Release();
}
}
Access query:
INSERT INTO tblTest ( Test, Test2 )
SELECT "a" AS Expr1, "B" AS Expr2;

JSkype error sending message

I'm trying to run the following code but unfortunately facing Error problems
package jskypeexample;
// import the JSkype packages
import net.lamot.java.jskype.general.AbstractMessenger;
import net.lamot.java.jskype.general.MessageListenerInterface;
import net.lamot.java.jskype.windows.Messenger;
import java.lang.Thread;
import java.lang.Exception;
/**
*
* #author swhite
*/
public class JSkypeExample implements MessageListenerInterface {
// create a messenger which we'll use for sending messages
private AbstractMessenger msgr = null;
/** Creates a new instance of JSkypeExample */
public JSkypeExample() {
msgr = new Messenger();
msgr.addListener(this);
msgr.initialize();
try {
// This number may vary on your system depending on the amount
// of time required to initialize the msgr.
Thread.sleep(1000);
// send the Skype API text command
msgr.sendMessage("Message seanmwhite Hello from UI Student");
msgr.sendMessage("SEARCH FRIENDS");
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
new JSkypeExample();
}
public void onMessageReceived(String str) {
// This is where you will handle all strings that are returned.
System.out.println(str);
}
}
But when I comment the following lines then it runs well.
msgr.initialize();
msgr.sendMessage("Message seanmwhite Hello from UI Student");
msgr.sendMessage("SEARCH FRIENDS");
But I have to send commands to receive the response. Actually I'm using JSkype Api (open source api from java ).

You have to set your boolean value that your initilaze function is returning to true or catch that execpetion if it is false.