Observability Done Right: Best Practices and Anti-Patterns for Effective System Monitoring

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  WHAT Observability is a concept that refers to the ability to gain insights into the behavior and performance of complex systems. In the context of software engineering, observability involves the collection, analysis, and visualization of data from software applications, infrastructure, and other components of a system. In the animal kingdom, observability plays a critical role in survival, allowing animals to monitor their surroundings, detect threats, and find food. Dolphins use echolocation to observe their surroundings. They emit high-frequency sounds that bounce off objects, allowing them to create a 3D map of their environment. Thanks for reading Knowledge Cafe! Subscribe for free to receive new posts and support my work. Subscribed WHY In today's era, architectures are becoming increasingly large, complex, and fast-paced due to the faster development and deployment of software by distributed teams with the help of DevOps, continuous delivery, and agile development methodo...

How to check if String Starts with one of the several prefixes

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In my current project I had requirement to find if given string starts with any of provided prefixes or not. If yes then do special handling otherwise normal processing. 

There are few ways to achieve this, mentioned below. Please comment if you know any better way or problem in below approaches.

Java String Manipulation
 

(1) Iteration and use startsWith() method
This has limitation if search string varies over period of time, we might need to recompile code.
This will take longer if search string list is too large
static void javaStdWay(String testString, List<String> searchStringList) {
        boolean flag = false;
        for (String searchSt : searchStringList) {
            if (testString.toUpperCase().startsWith(searchSt.toUpperCase())) {
                System.out.println("TestString {" + testString + "} starts with " + searchSt);
                flag = true;
            }
        }
        if (!flag) {
            System.out.println("TestString {" + testString + "} does not start with any search string" + searchStringList);
        }
    }

(2) Regex way : This looks better as we can add regex in property file and application restart will take care of new regex.
static void regexWay(String testString, List<String> searchList) {
        String pattern = "";
        boolean flag = false;
        for (String searchSt : searchList) {
            if (!pattern.isEmpty()) {
                pattern = pattern + "|" + searchSt;
            } else {
                pattern = searchSt;
            }
        }
        if (testString.matches("(" + pattern + ").*")) {
            System.out.println("TestString {" + testString + "} starts with one of the  " + searchList);
            flag = true;
        }
        if (!flag) {
            System.out.println("TestString {" + testString + "} does not start with any search string" + searchList);
        }
    }

(3) Apache commons lang lib use. This looks more promising as it handles null and other cases efficiently.
static void apacheWay(String testString, List<String> searchStringList) {

        boolean flag = false;
        if (StringUtils.startsWithAny(testString, searchStringList.toArray(new String[searchStringList.size()]))) {
            System.out.println("TestString {" + testString + "} starts with one of the  " + searchStringList);
            flag = true;
        }
        if (!flag) {
            System.out.println("TestString {" + testString + "} does not start with any search string" + searchStringList);
        }
    }

Main method of program for execution of above three methods.
   
   
 public static void main(String[] args) {
        String testString = "US.Newyork"; // DE.Essen
        List<String> searchStringList = new ArrayList<String>();
        searchStringList.add("US");
        searchStringList.add("UK");
        searchStringList.add("NZ");
        searchStringList.add("IN");
        regexWay(testString, searchStringList);
        javaStdWay(testString, searchStringList);
        apacheWay(testString, searchStringList);
    }



   
Output:

   
TestString {US.Newyork} starts with one of the  [US, UK, NZ, IN]
TestString {US.Newyork} starts with US
TestString {US.Newyork} starts with one of the  [US, UK, NZ, IN]



   
Comments and suggestions are welcome.

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