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vavr | nonprofit objectfunctional library | Functional Programming library

 by   vavr-io Java Version: v0.10.4 License: Non-SPDX

 by   vavr-io Java Version: v0.10.4 License: Non-SPDX

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kandi X-RAY | vavr Summary

vavr is a Java library typically used in Programming Style, Functional Programming applications. vavr has no bugs, it has no vulnerabilities, it has build file available and it has high support. However vavr has a Non-SPDX License. You can download it from GitHub, Maven.
See User Guide and/or Javadoc.
Support
Support
Quality
Quality
Security
Security
License
License
Reuse
Reuse

kandi-support Support

  • vavr has a highly active ecosystem.
  • It has 4675 star(s) with 542 fork(s). There are 175 watchers for this library.
  • It had no major release in the last 12 months.
  • There are 58 open issues and 1106 have been closed. On average issues are closed in 103 days. There are 4 open pull requests and 0 closed requests.
  • It has a negative sentiment in the developer community.
  • The latest version of vavr is v0.10.4
vavr Support
Best in #Functional Programming
Average in #Functional Programming
vavr Support
Best in #Functional Programming
Average in #Functional Programming

quality kandi Quality

  • vavr has 0 bugs and 0 code smells.
vavr Quality
Best in #Functional Programming
Average in #Functional Programming
vavr Quality
Best in #Functional Programming
Average in #Functional Programming

securitySecurity

  • vavr has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
  • vavr code analysis shows 0 unresolved vulnerabilities.
  • There are 0 security hotspots that need review.
vavr Security
Best in #Functional Programming
Average in #Functional Programming
vavr Security
Best in #Functional Programming
Average in #Functional Programming

license License

  • vavr has a Non-SPDX License.
  • Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.
vavr License
Best in #Functional Programming
Average in #Functional Programming
vavr License
Best in #Functional Programming
Average in #Functional Programming

buildReuse

  • vavr releases are available to install and integrate.
  • Deployable package is available in Maven.
  • Build file is available. You can build the component from source.
  • vavr saves you 67702 person hours of effort in developing the same functionality from scratch.
  • It has 81176 lines of code, 12314 functions and 311 files.
  • It has high code complexity. Code complexity directly impacts maintainability of the code.
vavr Reuse
Best in #Functional Programming
Average in #Functional Programming
vavr Reuse
Best in #Functional Programming
Average in #Functional Programming
Top functions reviewed by kandi - BETA

kandi has reviewed vavr and discovered the below as its top functions. This is intended to give you an instant insight into vavr implemented functionality, and help decide if they suit your requirements.

  • Waits for the thread to complete .
  • Returns a comparator that is compatible with the given tuples .
  • Extends the current stream using the provided function .
  • Find all unique trees .
  • Apply a given validation to the sequence .
  • Inserts elements into this Array .
  • Transposes a matrix .
  • Recursively expand the array .
  • Merge two leaf nodes .
  • Creates a new character sequence .

vavr Key Features

vʌvr (formerly called Javaslang) is a non-commercial, non-profit object-functional library that runs with Java 8+. It aims to reduce the lines of code and increase code quality.

vavr return from loop if condition fails

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private static Validation<RuntimeException, List<String>> isCategoryValid(List<String> categories) {
    return Validation.fromEither(
            Either.traverseRight(categories, Example::validateCategory).map(Seq::toList)
    );
}

private static Either<RuntimeException, String> validateCategory(String category) {
    // ...more validations
    return category.equals("") ? Either.left(new RuntimeException("Details cannot be empty")) : Either.right(category);
}
private static Validation<Seq<RuntimeException>, List<String>> isCategoryValid(
        List<String> categories) {

    return Validation.traverse(categories, Example::validateCategory).map(Seq::toList);
}


private static Validation<List<RuntimeException>, String> validateCategory(String category) {
    // ... combine multiple validations for the same category
    return category.equals("") ? invalid(List.of(new RuntimeException("Details cannot be empty"))) : valid(category);
}
-----------------------
private static Validation<RuntimeException, List<String>> isCategoryValid(List<String> categories) {
    return Validation.fromEither(
            Either.traverseRight(categories, Example::validateCategory).map(Seq::toList)
    );
}

private static Either<RuntimeException, String> validateCategory(String category) {
    // ...more validations
    return category.equals("") ? Either.left(new RuntimeException("Details cannot be empty")) : Either.right(category);
}
private static Validation<Seq<RuntimeException>, List<String>> isCategoryValid(
        List<String> categories) {

    return Validation.traverse(categories, Example::validateCategory).map(Seq::toList);
}


private static Validation<List<RuntimeException>, String> validateCategory(String category) {
    // ... combine multiple validations for the same category
    return category.equals("") ? invalid(List.of(new RuntimeException("Details cannot be empty"))) : valid(category);
}

Sending-receiving collection over RabbitMQ in Spring Boot

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/**
 * When false (default), fall back to type id headers if the type (or contents of a container
 * type) is abstract. Set to true if conversion should always be attempted - perhaps because
 * a custom deserializer has been configured on the {@link ObjectMapper}. If the attempt fails,
 * fall back to headers.
 * @param alwaysAttemptConversion true to attempt.
 * @since 2.2.8
 */
public void setAlwaysConvertToInferredType(boolean alwaysAttemptConversion) {
-----------------------
    @PostConstruct
    public void init() {
        List<POJO> payload = new ArrayList<>();
        payload.add(new POJO(1,2));
        payload.add(new POJO(3,4));
        //POJO payload = new POJO(1,2);
        template.convertAndSend(
            outbox,
            "",
            payload,
            message -> {
                var props = message.getMessageProperties();
                props.setMessageId(UUID.randomUUID().toString());
                return message;
            }
        );
    }

    @RabbitListener(queues = "${amqp.inbox}")
    public void listen(List<POJO> pojos) {
        System.out.println("Message reached:" + pojos);
    }
Message reached:[com.skapral.POJO@7af8fa38, com.skapral.POJO@5569d76c]
-----------------------
    @PostConstruct
    public void init() {
        List<POJO> payload = new ArrayList<>();
        payload.add(new POJO(1,2));
        payload.add(new POJO(3,4));
        //POJO payload = new POJO(1,2);
        template.convertAndSend(
            outbox,
            "",
            payload,
            message -> {
                var props = message.getMessageProperties();
                props.setMessageId(UUID.randomUUID().toString());
                return message;
            }
        );
    }

    @RabbitListener(queues = "${amqp.inbox}")
    public void listen(List<POJO> pojos) {
        System.out.println("Message reached:" + pojos);
    }
Message reached:[com.skapral.POJO@7af8fa38, com.skapral.POJO@5569d76c]

Can't use Manifold in gradle java project

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implementation 'systems.manifold:manifold-science:2021.1.25-SNAPSHOT'
implementation 'systems.manifold:manifold-ext:2021.1.25-SNAPSHOT'
maven { url 'https://oss.sonatype.org/content/repositories/snapshots/' }
import manifold.ext.rt.api.Extension;
import manifold.ext.rt.api.This;
import manifold.ext.rt.api.ComparableUsing;
-----------------------
implementation 'systems.manifold:manifold-science:2021.1.25-SNAPSHOT'
implementation 'systems.manifold:manifold-ext:2021.1.25-SNAPSHOT'
maven { url 'https://oss.sonatype.org/content/repositories/snapshots/' }
import manifold.ext.rt.api.Extension;
import manifold.ext.rt.api.This;
import manifold.ext.rt.api.ComparableUsing;
-----------------------
implementation 'systems.manifold:manifold-science:2021.1.25-SNAPSHOT'
implementation 'systems.manifold:manifold-ext:2021.1.25-SNAPSHOT'
maven { url 'https://oss.sonatype.org/content/repositories/snapshots/' }
import manifold.ext.rt.api.Extension;
import manifold.ext.rt.api.This;
import manifold.ext.rt.api.ComparableUsing;
-----------------------
implementation 'systems.manifold:manifold-science:2021.1.25-SNAPSHOT'
implementation 'systems.manifold:manifold-ext:2021.1.25-SNAPSHOT'
maven { url 'https://oss.sonatype.org/content/repositories/snapshots/' }
import manifold.ext.rt.api.Extension;
import manifold.ext.rt.api.This;
import manifold.ext.rt.api.ComparableUsing;
-----------------------
plugins {
  id 'java'
}

group 'com.example'
version '1.0-SNAPSHOT'

targetCompatibility = 11
sourceCompatibility = 11

repositories {
    jcenter()
    maven { url 'https://oss.sonatype.org/content/repositories/snapshots/' }
}

configurations {
    // give tests access to annotationProcessor dependencies
    testImplementation.extendsFrom annotationProcessor
}

dependencies {
    implementation 'systems.manifold:manifold-ext-rt:2021.1.25'

    testCompile 'junit:junit:4.12'
    // Add manifold to -processorpath for javac
    annotationProcessor group: 'systems.manifold', name: 'manifold-ext', version: '2021.1.25'
}

if (JavaVersion.current() != JavaVersion.VERSION_1_8 &&
    sourceSets.main.allJava.files.any {it.name == "module-info.java"}) {
    tasks.withType(JavaCompile) {
        // if you DO define a module-info.java file:
        options.compilerArgs += ['-Xplugin:Manifold', '--module-path', it.classpath.asPath]
    }
} else {
    tasks.withType(JavaCompile) {
        // If you DO NOT define a module-info.java file:
        options.compilerArgs += ['-Xplugin:Manifold']
    }
}

java.lang.NullPointerException: null at org.apache.camel.model.ModelHelper.getNamespaceAwareFromExpression(ModelHelper.java:263)

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<when>
    <simple>${header.sattelitesCount} > 0</simple>

Volatile variable read behavior

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public T get() {
    return (supplier == null) ? value : computeValue();
}

Serialize and Deserialize Java object having vavr list

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ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new VavrModule());
import com.fasterxml.jackson.databind.ObjectMapper;
import io.vavr.collection.List;
import io.vavr.jackson.datatype.VavrModule;
import org.apache.commons.lang3.builder.ToStringBuilder;

import java.io.IOException;

class Lol2 {

    public static void main(String[] args) throws IOException {
        Customer c = new Customer();
        Remark r = new Remark();
        r.whatever = "whatever";
        c.remarks = List.of(r);

        ObjectMapper ow = new ObjectMapper();
        ow.registerModule(new VavrModule());

        System.out.println(c);
        String json = ow.writeValueAsString(c);
        System.out.println(json);
        Customer c2 = ow.readValue(json, Customer.class);
        System.out.println(c2);

    }
}

class Customer {

    List<Remark> remarks;

    public List<Remark> getRemarks() {
        return remarks;
    }

    public void setRemarks(List<Remark> remarks) {
        this.remarks = remarks;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this)
            .append("remarks", remarks)
            .toString();
    }
}

class Remark {

    String whatever;

    public String getWhatever() {
        return whatever;
    }

    public void setWhatever(String whatever) {
        this.whatever = whatever;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this)
            .append("whatever", whatever)
            .toString();
    }
}

-----------------------
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new VavrModule());
import com.fasterxml.jackson.databind.ObjectMapper;
import io.vavr.collection.List;
import io.vavr.jackson.datatype.VavrModule;
import org.apache.commons.lang3.builder.ToStringBuilder;

import java.io.IOException;

class Lol2 {

    public static void main(String[] args) throws IOException {
        Customer c = new Customer();
        Remark r = new Remark();
        r.whatever = "whatever";
        c.remarks = List.of(r);

        ObjectMapper ow = new ObjectMapper();
        ow.registerModule(new VavrModule());

        System.out.println(c);
        String json = ow.writeValueAsString(c);
        System.out.println(json);
        Customer c2 = ow.readValue(json, Customer.class);
        System.out.println(c2);

    }
}

class Customer {

    List<Remark> remarks;

    public List<Remark> getRemarks() {
        return remarks;
    }

    public void setRemarks(List<Remark> remarks) {
        this.remarks = remarks;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this)
            .append("remarks", remarks)
            .toString();
    }
}

class Remark {

    String whatever;

    public String getWhatever() {
        return whatever;
    }

    public void setWhatever(String whatever) {
        this.whatever = whatever;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this)
            .append("whatever", whatever)
            .toString();
    }
}

Using JGrapht's BreadthFirstIterator, by choosing one particular edge type

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public Set<Employee> getSupervicedEmployees(Employee superviser){
  Set<Employee> employees = new HashSet<>();
  Iterator<Employee> bfs = new BreadthFirstIterator(org, supervisor);
  while (iterator.hasNext()) {
    employees.add(iterator.next());
  }
  return employees;
}
public Set<Employee> getBosses(Employee employee){
  Set<Employee> bosses = new HashSet<>();
  while(!org.getIncomingEdgesOf(employee).isEmpty()){
    Employee boss=org.getIncomingEdgesOf(employee).iterator().next();
    bosses.add(boss);
    employee=boss;
  }
  return bosses;
}
public Set<Employee> getBosses(Employee employee){
  if(org.getIncomingEdgesOf(employee).isEmpty()){
    return Collections.emptySet(); //this employee is the CEO
  }else{
    Employee boss=org.getIncomingEdgesOf(employee).iterator().next();
    Set<Employee> bosses = new HashSet<>(Arrays.asList(boss));
    bosses.addAll(getBosses(boss)); //Get the bosses of the boss
    return bosses;
  }
}
-----------------------
public Set<Employee> getSupervicedEmployees(Employee superviser){
  Set<Employee> employees = new HashSet<>();
  Iterator<Employee> bfs = new BreadthFirstIterator(org, supervisor);
  while (iterator.hasNext()) {
    employees.add(iterator.next());
  }
  return employees;
}
public Set<Employee> getBosses(Employee employee){
  Set<Employee> bosses = new HashSet<>();
  while(!org.getIncomingEdgesOf(employee).isEmpty()){
    Employee boss=org.getIncomingEdgesOf(employee).iterator().next();
    bosses.add(boss);
    employee=boss;
  }
  return bosses;
}
public Set<Employee> getBosses(Employee employee){
  if(org.getIncomingEdgesOf(employee).isEmpty()){
    return Collections.emptySet(); //this employee is the CEO
  }else{
    Employee boss=org.getIncomingEdgesOf(employee).iterator().next();
    Set<Employee> bosses = new HashSet<>(Arrays.asList(boss));
    bosses.addAll(getBosses(boss)); //Get the bosses of the boss
    return bosses;
  }
}
-----------------------
public Set<Employee> getSupervicedEmployees(Employee superviser){
  Set<Employee> employees = new HashSet<>();
  Iterator<Employee> bfs = new BreadthFirstIterator(org, supervisor);
  while (iterator.hasNext()) {
    employees.add(iterator.next());
  }
  return employees;
}
public Set<Employee> getBosses(Employee employee){
  Set<Employee> bosses = new HashSet<>();
  while(!org.getIncomingEdgesOf(employee).isEmpty()){
    Employee boss=org.getIncomingEdgesOf(employee).iterator().next();
    bosses.add(boss);
    employee=boss;
  }
  return bosses;
}
public Set<Employee> getBosses(Employee employee){
  if(org.getIncomingEdgesOf(employee).isEmpty()){
    return Collections.emptySet(); //this employee is the CEO
  }else{
    Employee boss=org.getIncomingEdgesOf(employee).iterator().next();
    Set<Employee> bosses = new HashSet<>(Arrays.asList(boss));
    bosses.addAll(getBosses(boss)); //Get the bosses of the boss
    return bosses;
  }
}
-----------------------
private io.vavr.collection.List<Employee> pickAllSubordinates(Graph<Employee,EmployeeReportsToRelationship> g, Employee herSelf) {

    Set<EmployeeReportsToRelationship> allIncomings = io.vavr.collection.HashSet.ofAll(g.incomingEdgesOf(herSelf));
    var allReportingToThisEmployee = allIncomings.map(relation -> g.getEdgeSource(relation));

    if (allReportingToThisEmployee.isEmpty()) {
        return (io.vavr.collection.List.empty());
    }
    else {
        io.vavr.collection.List<Employee> accumulatorOfSubordinates = io.vavr.collection.List.empty();
        for (Employee nextEmployee: allReportingToThisEmployee) { 
            accumulatorOfSubordinates = accumulatorOfSubordinates.append(nextEmployee).appendAll(pickAllSubordinates(g,nextEmployee));
         
        }
        return (accumulatorOfSubordinates);
    }
}

Convert a map of lists into a list of maps

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public static void main(String[] args) {
    Map<String, List<Integer>> map = new HashMap<>();
    map.put("a", Arrays.asList(1, 2, 3));
    map.put("b", Arrays.asList(4, 5, 6));
    map.put("c", Arrays.asList(7));

    List<Map.Entry<String, List<Integer>>> list =
            new ArrayList<>(map.entrySet());

    List<Map<String, Integer>> result = new ArrayList<>();
    combine(list, 0, new HashMap<>(), result);
    System.out.println(result);
}
static void combine(List<Map.Entry<String, List<Integer>>> list, int n,
                    Map<String, Integer> part,
                    List<Map<String, Integer>> result) {
    if (n >= list.size()) {
        result.add(new HashMap<>(part));
    } else {
        Map.Entry<String, List<Integer>> e = list.get(n);
        for (Integer i : e.getValue()) {
            part.put(e.getKey(), i);
            combine(list, n + 1, part, result);
        }
        part.remove(e.getKey());
    }
}
[
  {a=1, b=4, c=7}, {a=1, b=5, c=7}, {a=1, b=6, c=7},
  {a=2, b=4, c=7}, {a=2, b=5, c=7}, {a=2, b=6, c=7},
  {a=3, b=4, c=7}, {a=3, b=5, c=7}, {a=3, b=6, c=7}
]
-----------------------
public static void main(String[] args) {
    Map<String, List<Integer>> map = new HashMap<>();
    map.put("a", Arrays.asList(1, 2, 3));
    map.put("b", Arrays.asList(4, 5, 6));
    map.put("c", Arrays.asList(7));

    List<Map.Entry<String, List<Integer>>> list =
            new ArrayList<>(map.entrySet());

    List<Map<String, Integer>> result = new ArrayList<>();
    combine(list, 0, new HashMap<>(), result);
    System.out.println(result);
}
static void combine(List<Map.Entry<String, List<Integer>>> list, int n,
                    Map<String, Integer> part,
                    List<Map<String, Integer>> result) {
    if (n >= list.size()) {
        result.add(new HashMap<>(part));
    } else {
        Map.Entry<String, List<Integer>> e = list.get(n);
        for (Integer i : e.getValue()) {
            part.put(e.getKey(), i);
            combine(list, n + 1, part, result);
        }
        part.remove(e.getKey());
    }
}
[
  {a=1, b=4, c=7}, {a=1, b=5, c=7}, {a=1, b=6, c=7},
  {a=2, b=4, c=7}, {a=2, b=5, c=7}, {a=2, b=6, c=7},
  {a=3, b=4, c=7}, {a=3, b=5, c=7}, {a=3, b=6, c=7}
]
-----------------------
public static void main(String[] args) {
    Map<String, List<Integer>> map = new HashMap<>();
    map.put("a", Arrays.asList(1, 2, 3));
    map.put("b", Arrays.asList(4, 5, 6));
    map.put("c", Arrays.asList(7));

    List<Map.Entry<String, List<Integer>>> list =
            new ArrayList<>(map.entrySet());

    List<Map<String, Integer>> result = new ArrayList<>();
    combine(list, 0, new HashMap<>(), result);
    System.out.println(result);
}
static void combine(List<Map.Entry<String, List<Integer>>> list, int n,
                    Map<String, Integer> part,
                    List<Map<String, Integer>> result) {
    if (n >= list.size()) {
        result.add(new HashMap<>(part));
    } else {
        Map.Entry<String, List<Integer>> e = list.get(n);
        for (Integer i : e.getValue()) {
            part.put(e.getKey(), i);
            combine(list, n + 1, part, result);
        }
        part.remove(e.getKey());
    }
}
[
  {a=1, b=4, c=7}, {a=1, b=5, c=7}, {a=1, b=6, c=7},
  {a=2, b=4, c=7}, {a=2, b=5, c=7}, {a=2, b=6, c=7},
  {a=3, b=4, c=7}, {a=3, b=5, c=7}, {a=3, b=6, c=7}
]
-----------------------
public static void main(String[] args) {
    Map<String, int[]> map = new HashMap<>();
    map.put("a", new int[]{1, 2, 3});
    map.put("b", new int[]{4, 5, 6});
    map.put("c", new int[]{7});
    List<Map<String, Integer>> combinations = new ArrayList<>();
    System.out.println(getCombinations(
            map, combinations, 0,
            new HashMap<String, Integer>(), map.values().size()));
}
private static List<Map<String, Integer>> getCombinations(
        Map<String, int[]> map, List<Map<String, Integer>> combinations, int i,
        Map<String, Integer> current, int len) {
    if (i >= len) {
        combinations.add(current);
    } else {
        String key = (String) map.keySet().toArray()[i];
        int[] value = map.get(key);
        for (int num : value) {
            current.put(key, num);
            getCombinations(map, combinations, i + 1,
                    new HashMap<>(current), len);
        }
    }
    return combinations;
}
[
  {a=1, b=4, c=7}, {a=1, b=5, c=7}, {a=1, b=6, c=7}, 
  {a=2, b=4, c=7}, {a=2, b=5, c=7}, {a=2, b=6, c=7}, 
  {a=3, b=4, c=7}, {a=3, b=5, c=7}, {a=3, b=6, c=7}
]
-----------------------
public static void main(String[] args) {
    Map<String, int[]> map = new HashMap<>();
    map.put("a", new int[]{1, 2, 3});
    map.put("b", new int[]{4, 5, 6});
    map.put("c", new int[]{7});
    List<Map<String, Integer>> combinations = new ArrayList<>();
    System.out.println(getCombinations(
            map, combinations, 0,
            new HashMap<String, Integer>(), map.values().size()));
}
private static List<Map<String, Integer>> getCombinations(
        Map<String, int[]> map, List<Map<String, Integer>> combinations, int i,
        Map<String, Integer> current, int len) {
    if (i >= len) {
        combinations.add(current);
    } else {
        String key = (String) map.keySet().toArray()[i];
        int[] value = map.get(key);
        for (int num : value) {
            current.put(key, num);
            getCombinations(map, combinations, i + 1,
                    new HashMap<>(current), len);
        }
    }
    return combinations;
}
[
  {a=1, b=4, c=7}, {a=1, b=5, c=7}, {a=1, b=6, c=7}, 
  {a=2, b=4, c=7}, {a=2, b=5, c=7}, {a=2, b=6, c=7}, 
  {a=3, b=4, c=7}, {a=3, b=5, c=7}, {a=3, b=6, c=7}
]
-----------------------
public static void main(String[] args) {
    Map<String, int[]> map = new HashMap<>();
    map.put("a", new int[]{1, 2, 3});
    map.put("b", new int[]{4, 5, 6});
    map.put("c", new int[]{7});
    List<Map<String, Integer>> combinations = new ArrayList<>();
    System.out.println(getCombinations(
            map, combinations, 0,
            new HashMap<String, Integer>(), map.values().size()));
}
private static List<Map<String, Integer>> getCombinations(
        Map<String, int[]> map, List<Map<String, Integer>> combinations, int i,
        Map<String, Integer> current, int len) {
    if (i >= len) {
        combinations.add(current);
    } else {
        String key = (String) map.keySet().toArray()[i];
        int[] value = map.get(key);
        for (int num : value) {
            current.put(key, num);
            getCombinations(map, combinations, i + 1,
                    new HashMap<>(current), len);
        }
    }
    return combinations;
}
[
  {a=1, b=4, c=7}, {a=1, b=5, c=7}, {a=1, b=6, c=7}, 
  {a=2, b=4, c=7}, {a=2, b=5, c=7}, {a=2, b=6, c=7}, 
  {a=3, b=4, c=7}, {a=3, b=5, c=7}, {a=3, b=6, c=7}
]
-----------------------
public class CartesianProduct {
    public static <T> Seq<Seq<T>> on(Seq<Seq<T>> sets) {
        if (sets.size() >= 1) {
            var javaList = sets.map(Value::toJavaList).toJavaList();
            var out = computeCombinations(javaList);
            return Vector.ofAll(out.stream().map(Vector::ofAll));
        }
        return Vector.empty();
    }

    private static <T> List<List<T>> appendElements(
            List<List<T>> combinations, List<T> extraElements) {
        return combinations.stream()
                .flatMap(oldCombination ->
                        extraElements.stream().map(extra -> {
                            List<T> combinationWithExtra =
                                    new ArrayList<>(oldCombination);
                            combinationWithExtra.add(extra);
                            return combinationWithExtra;
                        }))
                .collect(Collectors.toList());
    }

    private static <T> List<List<T>> computeCombinations(List<List<T>> lists) {
        List<List<T>> currentCombinations = List.of(List.of());
        for (List<T> list : lists) {
            currentCombinations = appendElements(currentCombinations, list);
        }
        return currentCombinations;
    }
}
Seq<Seq<Integer>> allValuesProduct = CartesianProduct.on(mapOfLists.values());
Seq<Map<String, Integer>> listOfMaps =
        allValuesProduct.map(values -> HashMap.tabulate(
                values.length(),
                i -> Tuple.of(
                        mapOfLists.keySet().toList().get(i),
                        values.get(i))));
-----------------------
public class CartesianProduct {
    public static <T> Seq<Seq<T>> on(Seq<Seq<T>> sets) {
        if (sets.size() >= 1) {
            var javaList = sets.map(Value::toJavaList).toJavaList();
            var out = computeCombinations(javaList);
            return Vector.ofAll(out.stream().map(Vector::ofAll));
        }
        return Vector.empty();
    }

    private static <T> List<List<T>> appendElements(
            List<List<T>> combinations, List<T> extraElements) {
        return combinations.stream()
                .flatMap(oldCombination ->
                        extraElements.stream().map(extra -> {
                            List<T> combinationWithExtra =
                                    new ArrayList<>(oldCombination);
                            combinationWithExtra.add(extra);
                            return combinationWithExtra;
                        }))
                .collect(Collectors.toList());
    }

    private static <T> List<List<T>> computeCombinations(List<List<T>> lists) {
        List<List<T>> currentCombinations = List.of(List.of());
        for (List<T> list : lists) {
            currentCombinations = appendElements(currentCombinations, list);
        }
        return currentCombinations;
    }
}
Seq<Seq<Integer>> allValuesProduct = CartesianProduct.on(mapOfLists.values());
Seq<Map<String, Integer>> listOfMaps =
        allValuesProduct.map(values -> HashMap.tabulate(
                values.length(),
                i -> Tuple.of(
                        mapOfLists.keySet().toList().get(i),
                        values.get(i))));
-----------------------
Map<String, List<Integer>> mapOfLists = new LinkedHashMap<>();
mapOfLists.put("a", List.of(1, 2, 3));
mapOfLists.put("b", List.of(4, 5, 6));
mapOfLists.put("c", List.of(7));
List<Map<String, Integer>> listOfMaps = mapOfLists.entrySet().stream()
        // Stream<List<Map<String,Integer>>>
        .map(entry -> entry.getValue().stream()
                // represent list elements as Map<String,Integer>
                .map(element -> Map.of(entry.getKey(), element))
                // collect a list of maps
                .collect(Collectors.toList()))
        // intermediate output
        //[{a=1}, {a=2}, {a=3}]
        //[{b=4}, {b=5}, {b=6}]
        //[{c=7}]
        .peek(System.out::println)
        // reduce a stream of lists to a single list
        // by sequentially multiplying the list pairs
        .reduce((list1, list2) -> list1.stream()
                // combinations of elements,
                // i.e. maps, from two lists
                .flatMap(map1 -> list2.stream()
                        .map(map2 -> {
                            // join entries of two maps
                            Map<String, Integer> map =
                                    new LinkedHashMap<>();
                            map.putAll(map1);
                            map.putAll(map2);
                            return map;
                        }))
                // collect into a single list
                .collect(Collectors.toList()))
        .orElse(null);
// output
listOfMaps.forEach(System.out::println);
//{a=1, b=4, c=7}
//{a=1, b=5, c=7}
//{a=1, b=6, c=7}
//{a=2, b=4, c=7}
//{a=2, b=5, c=7}
//{a=2, b=6, c=7}
//{a=3, b=4, c=7}
//{a=3, b=5, c=7}
//{a=3, b=6, c=7}
-----------------------
Map<String, List<Integer>> mapOfLists = new LinkedHashMap<>();
mapOfLists.put("a", List.of(1, 2, 3));
mapOfLists.put("b", List.of(4, 5, 6));
mapOfLists.put("c", List.of(7));
List<Map<String, Integer>> listOfMaps = mapOfLists.entrySet().stream()
        // Stream<List<Map<String,Integer>>>
        .map(entry -> entry.getValue().stream()
                // represent list elements as Map<String,Integer>
                .map(element -> Map.of(entry.getKey(), element))
                // collect a list of maps
                .collect(Collectors.toList()))
        // intermediate output
        //[{a=1}, {a=2}, {a=3}]
        //[{b=4}, {b=5}, {b=6}]
        //[{c=7}]
        .peek(System.out::println)
        // reduce a stream of lists to a single list
        // by sequentially multiplying the list pairs
        .reduce((list1, list2) -> list1.stream()
                // combinations of elements,
                // i.e. maps, from two lists
                .flatMap(map1 -> list2.stream()
                        .map(map2 -> {
                            // join entries of two maps
                            Map<String, Integer> map =
                                    new LinkedHashMap<>();
                            map.putAll(map1);
                            map.putAll(map2);
                            return map;
                        }))
                // collect into a single list
                .collect(Collectors.toList()))
        .orElse(null);
// output
listOfMaps.forEach(System.out::println);
//{a=1, b=4, c=7}
//{a=1, b=5, c=7}
//{a=1, b=6, c=7}
//{a=2, b=4, c=7}
//{a=2, b=5, c=7}
//{a=2, b=6, c=7}
//{a=3, b=4, c=7}
//{a=3, b=5, c=7}
//{a=3, b=6, c=7}
-----------------------
Map<String, List<Integer>> mapOfLists = new LinkedHashMap<>();
mapOfLists.put("a", List.of(1, 2, 3));
mapOfLists.put("b", List.of(4, 5, 6));
mapOfLists.put("c", List.of(7));
List<Map<String, Integer>> listOfMaps = mapOfLists.entrySet().stream()
        // Stream<List<Map<String,Integer>>>
        .map(entry -> entry.getValue().stream()
                // represent list elements as Map<String,Integer>
                .map(element -> Map.of(entry.getKey(), element))
                // collect a list of maps
                .collect(Collectors.toList()))
        // intermediate output
        //[{a=1}, {a=2}, {a=3}]
        //[{b=4}, {b=5}, {b=6}]
        //[{c=7}]
        .peek(System.out::println)
        // reduce a stream of lists to a single list
        // by sequentially multiplying the list pairs
        .reduce((list1, list2) -> list1.stream()
                // combinations of elements,
                // i.e. maps, from two lists
                .flatMap(map1 -> list2.stream()
                        .map(map2 -> {
                            // join entries of two maps
                            Map<String, Integer> map =
                                    new LinkedHashMap<>();
                            map.putAll(map1);
                            map.putAll(map2);
                            return map;
                        }))
                // collect into a single list
                .collect(Collectors.toList()))
        .orElse(null);
// output
listOfMaps.forEach(System.out::println);
//{a=1, b=4, c=7}
//{a=1, b=5, c=7}
//{a=1, b=6, c=7}
//{a=2, b=4, c=7}
//{a=2, b=5, c=7}
//{a=2, b=6, c=7}
//{a=3, b=4, c=7}
//{a=3, b=5, c=7}
//{a=3, b=6, c=7}
-----------------------
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

public class molToLom {

    public static void main(String[] args) {
        //This is what we have: A map of lists (mol)
        TreeMap<String, List<Integer>> mol = new TreeMap<String, List<Integer>>();
        mol.put("a", List.of(1, 2, 3));
        mol.put("b", List.of(4, 5, 6));
        mol.put("c", List.of(7));
        //we want a list of maps (lom)
        ArrayList<Map<String, Integer>> lom = new ArrayList<>();
        //Add an empty element. We'll need that later
        lom.add(new TreeMap<String, Integer>());
        //Now run through our map
        mol.forEach((tag, list) -> {
            //We rebuild our lom on every iteration. Otherwise we would get incomplete maps in our list
            ArrayList<Map<String, Integer>> tLom = new ArrayList<>();
            //Run through our list of maps and ...
            lom.forEach(map -> {
                //... combine every element in this list with every element in the list from our initial map entry
                list.forEach(i -> {
                    Map<String, Integer> m = new TreeMap<>(map);
                    m.put(tag, i);
                    tLom.add(m);
                });
            });
            //replace our last lom with the newly created one. Could be lom = tLom if lom was a field
            lom.clear();
            lom.addAll(tLom);
        });
        System.out.println(lom);
    }
}

Does this look like an efficient way to find vertices which have no outgoing edges in a graph (JGrapthT)?

copy iconCopydownload iconDownload
Set<Employee> verticesWithoutSucc = myGraph.vertexSet().stream().filter(v -> !Graphs.vertexHasSuccessors(myGraph,v)).collect(Collectors.toSet());

Vavr Try.filter NoSuchElementException

copy iconCopydownload iconDownload
cl -> cl.getResource( "config" )

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QUESTION

Could not get HttpClient cache - No ThreadContext available for thread id=1

Asked 2022-Feb-28 at 09:06

I'm working on upgrading our service to use 3.63.0 (upgrading from 3.57.0) and I've noticed the following warning (with stack trace) shows up in the logs that wasn't there on the previous version:

2022-02-18 14:03:41.038  WARN 1088 --- [           main] c.s.c.s.c.c.AbstractHttpClientCache      : Could not get HttpClient cache.

com.sap.cloud.sdk.cloudplatform.thread.exception.ThreadContextAccessException: No ThreadContext available for thread id=1.
    at com.sap.cloud.sdk.cloudplatform.thread.ThreadLocalThreadContextFacade.lambda$tryGetCurrentContext$0(ThreadLocalThreadContextFacade.java:39) ~[cloudplatform-core-3.63.0.jar:na]
    at io.vavr.Value.toTry(Value.java:1414) ~[vavr-0.10.4.jar:na]
    at com.sap.cloud.sdk.cloudplatform.thread.ThreadLocalThreadContextFacade.tryGetCurrentContext(ThreadLocalThreadContextFacade.java:37) ~[cloudplatform-core-3.63.0.jar:na]
    at io.vavr.control.Try.flatMapTry(Try.java:490) ~[vavr-0.10.4.jar:na]
    at io.vavr.control.Try.flatMap(Try.java:472) ~[vavr-0.10.4.jar:na]
    at com.sap.cloud.sdk.cloudplatform.thread.ThreadContextAccessor.tryGetCurrentContext(ThreadContextAccessor.java:84) ~[cloudplatform-core-3.63.0.jar:na]
    at com.sap.cloud.sdk.cloudplatform.connectivity.RequestScopedHttpClientCache.getCache(RequestScopedHttpClientCache.java:28) ~[cloudplatform-connectivity-3.63.0.jar:na]
    at com.sap.cloud.sdk.cloudplatform.connectivity.AbstractHttpClientCache.tryGetOrCreateHttpClient(AbstractHttpClientCache.java:78) ~[cloudplatform-connectivity-3.63.0.jar:na]
    at com.sap.cloud.sdk.cloudplatform.connectivity.AbstractHttpClientCache.tryGetHttpClient(AbstractHttpClientCache.java:46) ~[cloudplatform-connectivity-3.63.0.jar:na]
    at com.sap.cloud.sdk.cloudplatform.connectivity.HttpClientAccessor.tryGetHttpClient(HttpClientAccessor.java:153) ~[cloudplatform-connectivity-3.63.0.jar:na]
    at com.sap.cloud.sdk.cloudplatform.connectivity.HttpClientAccessor.getHttpClient(HttpClientAccessor.java:131) ~[cloudplatform-connectivity-3.63.0.jar:na]
    at com.octanner.mca.service.MarketingCloudApiContactService.uploadContacts(MarketingCloudApiContactService.java:138) ~[classes/:na]
    ...

This happens when the following calls are made...

Using the lower level API

HttpClient httpClient = HttpClientAccessor.getHttpClient(destination); // warning happens here
ODataRequestResultMultipartGeneric batchResult = requestBatch.execute(httpClient);

Using the higher level API

service
  .getAllContactOriginData()
  .withQueryParameter("$expand", "AdditionalIDs")
  .top(size)
  .filter(filter)
  .executeRequest(destination)); // warning happens here

Even though this warning shows up in the logs the service requests do continue to work as expected. It's just a little concerning to see this and I'm wondering if maybe I have something misconfigured. I reviewed all of the java docs and the troubleshooting page and didn't see anything out of the ordinary other than how I am fetching my destination, but even using the DestinationAccessor didn't seem to make a difference. Also, I'm not doing any asynchronous or multi-tenant processing.

Any help you or guidance you can give on this would be appreciated!

Cheers!

ANSWER

Answered 2022-Feb-28 at 09:06

Such an issue is often the result of missing Spring Boot annotations - especially in synchronous executions.

Please refer to our documentation to learn more about the SAP Cloud SDK Spring Boot integration.


Edit Feb. 28th 2022

It is safe to ignore the logged warning if your application does not need any of the SAP Cloud SDK's multitenancy features.

Error Cause

The SAP Cloud SDK for Java recently (in version 3.63.0) introduced a change to the thread propagation behavior of the HttpClientCache. With that change, we also adapted the logging in case the propagation didn't work as expected - this is often caused by not using the ThreadContextExecutor for wrapping asynchronous operations. This is the reason for logs like the one described by the issue author.

Planned Mitigation

In the meanwhile, we realized that these WARN logs are causing confusion on the consumer side. We are working on improving the situation by degrading the log level to INFO for the message and to DEBUG for the exception.

Source https://stackoverflow.com/questions/71180569

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install vavr

You can download it from GitHub, Maven.
You can use vavr like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the vavr component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

A small number of users have reported problems building Vavr. Read our contribution guide for details.

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