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eclipse-collections | Eclipse Collections is a collections framework | Functional Programming library

by eclipse Java Version: 11.1.0 License: No License

by eclipse Java Version: 11.1.0 License: No License

kandi X-RAY | eclipse-collections Summary

eclipse-collections is a Java library typically used in Programming Style, Functional Programming applications. eclipse-collections has no bugs, it has no vulnerabilities, it has build file available and it has high support. You can download it from GitHub, Maven.

Eclipse Collections is a comprehensive collections library for Java. The library enables productivity and performance by delivering an expressive and efficient set of APIs and types. The iteration protocol was inspired by the Smalltalk collection framework, and the collections are compatible with the Java Collection Framework types. Eclipse Collections is compatible with Java 8+. Eclipse Collections is a part of the OpenJDK Quality Outreach program, and it is validated for different versions of the OpenJDK.

Support

Support

Quality

Quality

Security

Security

License

License

Reuse

Reuse

kandi-support Support

eclipse-collections has a highly active ecosystem.
It has 2115 star(s) with 506 fork(s). There are 91 watchers for this library.
There were 3 major release(s) in the last 12 months.
There are 109 open issues and 317 have been closed. On average issues are closed in 173 days. There are 18 open pull requests and 0 closed requests.
It has a positive sentiment in the developer community.
The latest version of eclipse-collections is 11.1.0

eclipse-collections Support

Best in #Functional Programming

Average in #Functional Programming

eclipse-collections Support

Best in #Functional Programming

Average in #Functional Programming

quality kandi Quality

eclipse-collections has 0 bugs and 0 code smells.

eclipse-collections Quality

Best in #Functional Programming

Average in #Functional Programming

eclipse-collections Quality

Best in #Functional Programming

Average in #Functional Programming

security Security

eclipse-collections has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
eclipse-collections code analysis shows 0 unresolved vulnerabilities.
There are 0 security hotspots that need review.

eclipse-collections Security

Best in #Functional Programming

Average in #Functional Programming

eclipse-collections Security

Best in #Functional Programming

Average in #Functional Programming

license License

eclipse-collections does not have a standard license declared.
Check the repository for any license declaration and review the terms closely.
Without a license, all rights are reserved, and you cannot use the library in your applications.

eclipse-collections License

Best in #Functional Programming

Average in #Functional Programming

eclipse-collections License

Best in #Functional Programming

Average in #Functional Programming

build Reuse

eclipse-collections releases are available to install and integrate.
Deployable package is available in Maven.
Build file is available. You can build the component from source.
Installation instructions are not available. Examples and code snippets are available.
eclipse-collections saves you 646714 person hours of effort in developing the same functionality from scratch.
It has 327061 lines of code, 35010 functions and 2711 files.
It has medium code complexity. Code complexity directly impacts maintainability of the code.

eclipse-collections Reuse

Best in #Functional Programming

Average in #Functional Programming

eclipse-collections Reuse

Best in #Functional Programming

Average in #Functional Programming

Top functions reviewed by kandi - BETA

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

Get the value associated with the given key

Associates the value with the specified key

Returns the value associated with the given key

Puts all entries in the given map into the given executor

Puts all entries in the given array

Puts all of the elements in the given map into the given executor

Performs a sequential put operation on the given array

Iterate over the elements of this counter from the given index

Iterate over the items in the set

Perform parallel for each value in the table

Iterate over the values in the array

Returns the value associated with the specified key

Iterate over the elements in this list applying the specified index to the specified index

Determine if this Iterable matches the given predicate

Perform parallel aggregation for each value in the array

Inserts an object into the map

Returns the value with the given key and parameter

Iterate over the specified collection applying the provided Functions

Sets the previous element

Generates a chunk of integers from this group

Channels to a chunk of items

Iterates over all entries in the counter

Put an object into the map

Remove the key if present

Applies an aggregate function to the provided map

Perform parallel aggregation for each key

Get all kandi verified functions for this library.

Get all kandi verified functions for this library.

eclipse-collections Key Features

Eclipse Collections is a collections framework for Java with optimized data structures and a rich, functional and fluent API.

eclipse-collections Examples and Code Snippets

Community Discussions

Trending Discussions on eclipse-collections

How to deserialise Eclipse Collections types?
java.lang.NoClassDefFoundError: org/telegram/telegrambots/meta/exceptions/TelegramApiException
cannot find symbol: Package not recognized
Amount of Threads with subtasks

Trending Discussions on eclipse-collections

QUESTION

How to deserialise Eclipse Collections types?

Asked 2021-Jun-25 at 03:24

I came across this library eclipse-collections and it fits my use case. But unfortunately, I am not able to deserialize it using either Gson or Jackson - the two most popular libraries for serialization/deserialization.

Does any of the two libraries provide support for eclipse collections? If yes, then how?

ANSWER

Answered 2021-Jun-25 at 03:24

One of the docs on the Readme of the official github repo of eclipse-collections mentions:

Unfortunately, with new collection types comes incompatibility with normal serialization frameworks. Jackson, arguably the most popular JSON serialization framework for Java, is unable to deserialize Eclipse Collections types out-of-the-box. For this purpose, there is now a Jackson module supporting most Eclipse Collections types directly (including primitive collections).

Not only do they mention the issue but they also provide the solution to it. All you need to do is register the EclipseCollectionsModule with Jackson's ObjectMapper object like so:

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.eclipsecollections.EclipseCollectionsModule;

ObjectMapper mapper = new ObjectMapper().registerModule(new EclipseCollectionsModule());

Once you have done the above, you can now use the ObjectMapper as usual. So,

MutableIntLongMap myDeserialisedVariable = mapper.readValue(jsonString, MutableIntLongMap.class);

Source https://stackoverflow.com/questions/68125058

QUESTION

java.lang.NoClassDefFoundError: org/telegram/telegrambots/meta/exceptions/TelegramApiException

Asked 2021-Jan-31 at 10:35

I'm trying to deploy my first java application using Maven. In this case, this is just a simply telegram bot, but I get this error when trying to run it locally. After a little investigation, I found that java.lang.NoClassDefFoundError is an error that occurs when a jar file is not able to access a specific class in runtime, and in order to solve this, is necessary to add that class on classpath. I understand that when working on Maven, there is a simple way to add classes on the classpath, and it's by adding the right dependency on the pom.xml file. So this is what i've added:

     <dependencies>
         <dependency>
             <groupId>org.telegram</groupId>
             <artifactId>telegrambots-abilities</artifactId>
             <version>5.0.1.1</version>
         </dependency>
         <dependency>
             <groupId>org.telegram</groupId>
             <artifactId>telegrambots</artifactId>
             <version>5.0.1</version>
         </dependency>
         <dependency>
             <groupId>org.telegram</groupId>
             <artifactId>telegrambots-meta</artifactId>
             <version>5.0.1.1</version>
         </dependency>
     </dependencies>

And I think it was successfully added on the classpath because this is what I get when I read the MANIFEST.MF file on my jar file:

   Manifest-Version: 1.0
   Created-By: Apache Maven 3.6.3
   Built-By: agujared
   Build-Jdk: 15.0.1
   Class-Path: telegrambots-abilities-5.0.1.1.jar commons-lang3-3.11.jar ma
    pdb-3.0.8.jar kotlin-stdlib-1.2.71.jar kotlin-stdlib-common-1.2.71.jar
    annotations-13.0.jar eclipse-collections-api-11.0.0.M1.jar eclipse-coll
    ections-11.0.0.M1.jar eclipse-collections-forkjoin-11.0.0.M1.jar lz4-1.
    3.0.jar elsa-3.0.0-M5.jar slf4j-api-1.7.30.jar telegrambots-5.0.1.jar j
   ackson-annotations-2.11.3.jar jackson-jaxrs-json-provider-2.11.3.jar ja
   ckson-jaxrs-base-2.11.3.jar jackson-module-jaxb-annotations-2.11.3.jar
   jackson-core-2.11.3.jar jakarta.xml.bind-api-2.3.2.jar jakarta.activati
   on-api-1.2.1.jar jackson-databind-2.11.3.jar jersey-hk2-2.32.jar jersey
   -common-2.32.jar osgi-resource-locator-1.0.3.jar jakarta.activation-1.2
   .2.jar hk2-locator-2.6.1.jar aopalliance-repackaged-2.6.1.jar hk2-api-2
   .6.1.jar hk2-utils-2.6.1.jar javassist-3.25.0-GA.jar jersey-media-json-
   jackson-2.32.jar jersey-entity-filtering-2.32.jar jersey-container-griz
   zly2-http-2.32.jar jakarta.inject-2.6.1.jar grizzly-http-server-2.4.4.j
   ar grizzly-http-2.4.4.jar grizzly-framework-2.4.4.jar jakarta.ws.rs-api
   -2.1.6.jar jersey-server-2.32.jar jersey-client-2.32.jar jersey-media-j
   axb-2.32.jar jakarta.annotation-api-1.3.5.jar jakarta.validation-api-2.
   0.2.jar json-20180813.jar httpclient-4.5.13.jar httpcore-4.4.13.jar com
   mons-logging-1.2.jar commons-codec-1.11.jar httpmime-4.5.13.jar commons
   -io-2.8.0.jar telegrambots-meta-5.0.1.1.jar guava-30.0-jre.jar failurea
   ccess-1.0.1.jar listenablefuture-9999.0-empty-to-avoid-conflict-with-gu
   ava.jar jsr305-3.0.2.jar checker-qual-3.5.0.jar error_prone_annotations
   -2.3.4.jar j2objc-annotations-1.3.jar
  Main-Class: domain.Main

As you can see, telegrambots-meta-5.0.1.1.jar is part of the classpath attribute. How can I solve this?

By the way, I'm using Heroku Cloud to deploy this

ANSWER

Answered 2021-Jan-31 at 10:35

Sounds like you want and need to create a runnable/ executable JAR file (with external dependencies).

This requires your build process to be enhanced by this step, regardless of where it is executed Heroku, Jenkins, Bamboo or on your local - this is a maven setting and will affect each of them.

Also on your local you can run the build of your project by executing mvn clean package in your IDE and afterwards to run the created JAR from the target folder with: java -jar ${yourJarName}. It'll likely fail for the same reason.

This is, because Maven dependencies are added with a so called scope. These are for example:

compile
provided
runtime
test

Whereby compile is the default one and being implicitly applied in case you don't specify it - like in your case. (You can read more about the scopes here)

This means Maven will add your dependency to your IDE at compile time, but it will be missing at the runtime, when your trying to execute it.

The solution is to create a runnable/ executable JAR file (also called *fat JAR *) containing all the needed dependencies.

You can do it directly within Maven with the help of the maven-assembly-plugin like so:

<build>
  <plugins>
    <plugin>
      <artifactId>maven-assembly-plugin</artifactId>
      <configuration>
        <archive>
          <manifest>
            <mainClass>fully.qualified.MainClass</mainClass>
          </manifest>
        </archive>
        <descriptorRefs>
          <descriptorRef>jar-with-dependencies</descriptorRef>
        </descriptorRefs>
      </configuration>
    </plugin>
  </plugins>
</build>

Then you need to build your JAR like:

mvn clean compile assembly:single

Note: The compile goal must be added before assembly:single or otherwise the code on your own project is not included.

To ease the handling of the process this goal commonly is tied to a Maven build phase to execute automatically. This ensures the JAR is built when executing mvn clean package, mvn clean install or performing a deployment/ release:

<build>
    <plugins>
        <plugin>
            <artifactId>maven-assembly-plugin</artifactId>
            <configuration>
                <archive>
                    <manifest>
                        <mainClass>fully.qualified.MainClass</mainClass>
                    </manifest>
                </archive>
                <descriptorRefs>
                    <descriptorRef>jar-with-dependencies</descriptorRef>
                </descriptorRefs>
            </configuration>
            <executions>
                <execution>
                    <id>make-assembly</id> <!-- this is used for inheritance merges -->
                    <phase>package</phase> <!-- bind to the packaging phase -->
                    <goals>
                        <goal>single</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

Like this you can simply build your project with the mvn clean package command (probably the most common one) and it'll include the creation of the runnable/ executable JAR file. This will include all your needed dependencies and should resolve your java.lang.NoClassDefFoundError issue.

Just a short additional note

Creating runnable/ executable JAR file respectively fat JAR is not the only solution and maybe in some contexts unwanted. Since fat JAR files include all their needed dependencies, they are fairly big with all the related drawbacks (requires more bandwith to transmit, download size increases, same dependencies might be carried in multiple different JARs, ...).

For this reasons the fat JAR creation is avoided in Web Application Development with Java EE. Dependencies are only added at compile time, since it is known that a Servlet Container or Application Container like Tomcat or Wildfly will provide these at runtime to avoid the java.lang.NoClassDefFoundError. Therefore the different applications (JARs or in this context called WARs) don't need to provide the dependencies themself.

In your case it might also be the solution that you'll still build the thin JAR, but will provide the needed dependencies at runtime (e.g. separately downloading it and then specifying in the classpath before the execution).

Source https://stackoverflow.com/questions/65976406

QUESTION

cannot find symbol: Package not recognized

Asked 2020-Jul-04 at 01:56

I can't get this project compiled, even doing all the necessary configs but unfortunately without success.

I compiled first exchange-core successfully ! Using this command:

mvn install

And this is a require dependency for the other project to work.

After that, I got to target folder, and launched this command:

mvn install:install-file -Dfile=exchange-core-0.5.4-SNAPSHOT.jar -DgroupId=exchange.core2 -DartifactId=exchange-core -Dversion=0.0.1-SNAPSHOT -Dpackaging=jar -DgeneratePom=true

So I can make the dependencies accessible for other projects.

But when trying to compile the gateway (the project that will use the first compilation), I am getting this error !

[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Exchange REST Gateway 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) @ exchange-gateway-rest ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 9 resources
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ exchange-gateway-rest ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 62 source files to /build/exchange-gateway/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /build/exchange-gateway/src/main/java/exchange/core2/rest/controllers/SyncTradeMiscApiController.java:[26,33] package org.jetbrains.annotations does not exist
[ERROR] /build/exchange-gateway/src/main/java/exchange/core2/rest/RestGatewayApplication.java:[20,37] cannot find symbol
  symbol:   class OrderBookFastImpl
  location: package exchange.core2.core.orderbook
[ERROR] /build/exchange-gateway/src/main/java/exchange/core2/rest/RestGatewayApplication.java:[21,50] package exchange.core2.core.processors.journalling do
es not exist
[ERROR] /build/exchange-gateway/src/main/java/exchange/core2/rest/RestGatewayApplication.java:[31,52] cannot find symbol
  symbol:   class ThreadAffinityMode
  location: class exchange.core2.core.utils.UnsafeUtils
[ERROR] /build/exchange-gateway/src/main/java/exchange/core2/rest/RestGatewayApplication.java:[31,1] static import only from classes and interfaces
[ERROR] /build/exchange-gateway/src/main/java/exchange/core2/rest/controllers/SyncTradeMiscApiController.java:[64,6] cannot find symbol
  symbol:   class NotNull
  location: class exchange.core2.rest.controllers.SyncTradeMiscApiController
[INFO] 6 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 11.359 s
[INFO] Finished at: 2020-07-02T20:13:06Z
[INFO] Final Memory: 35M/85M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project exchange-gateway-rest: Compilation
 failure: Compilation failure:
[ERROR] /build/exchange-gateway/src/main/java/exchange/core2/rest/controllers/SyncTradeMiscApiController.java:[26,33] package org.jetbrains.annotations doe
s not exist
[ERROR] /build/exchange-gateway/src/main/java/exchange/core2/rest/RestGatewayApplication.java:[20,37] cannot find symbol
[ERROR]   symbol:   class OrderBookFastImpl
[ERROR]   location: package exchange.core2.core.orderbook
[ERROR] /build/exchange-gateway/src/main/java/exchange/core2/rest/RestGatewayApplication.java:[21,50] package exchange.core2.core.processors.journalling do
es not exist
[ERROR] /build/exchange-gateway/src/main/java/exchange/core2/rest/RestGatewayApplication.java:[31,52] cannot find symbol
[ERROR]   symbol:   class ThreadAffinityMode
[ERROR]   location: class exchange.core2.core.utils.UnsafeUtils
[ERROR] /build/exchange-gateway/src/main/java/exchange/core2/rest/RestGatewayApplication.java:[31,1] static import only from classes and interfaces
[ERROR] /build/exchange-gateway/src/main/java/exchange/core2/rest/controllers/SyncTradeMiscApiController.java:[64,6] cannot find symbol
[ERROR]   symbol:   class NotNull
[ERROR]   location: class exchange.core2.rest.controllers.SyncTradeMiscApiController
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

This error:

package org.jetbrains.annotations does not exist

Can be solved by adding jetbrains dependencies I think, or by removing it from the files.

But what about the others like:

cannot find symbol
[ERROR]   symbol:   class OrderBookFastImpl
[ERROR]   location: package exchange.core2.core.orderbook

Knowing that this dependencies are from the first project.

I am using docker with image: maven:3.5.2-jdk-8-alpine

Projects on github

Project 1 (exchange-core): https://github.com/mzheravin/exchange-core

Project 2 (exchange-gateway): https://github.com/exchange-core/exchange-gateway-rest

POM.XML file of the second project:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>exchange.core2</groupId>
    <artifactId>exchange-gateway-rest</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>Exchange REST Gateway</name>
    <description>Java Exchange Market Gateway</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
        <relativePath/>
    </parent>

    <properties>
        <skip.it>false</skip.it>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>

        <guava.version>25.0-jre</guava.version>
        <commons-math3.version>3.6.1</commons-math3.version>
        <commons-lang3.version>3.7</commons-lang3.version>

        <HikariCP.version>3.1.0</HikariCP.version>

        <eclipse.collections.version>9.2.0</eclipse.collections.version>
    </properties>

    <dependencyManagement>
        <dependencies>

            <dependency>
                <groupId>com.google.guava</groupId>
                <artifactId>guava</artifactId>
                <version>${guava.version}</version>
            </dependency>

            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
                <version>${commons-lang3.version}</version>
            </dependency>

            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-math3</artifactId>
                <version>${commons-math3.version}</version>
            </dependency>

            <!-- Eclipse (Goldman Sachs) collections -->
            <dependency>
                <groupId>org.eclipse.collections</groupId>
                <artifactId>eclipse-collections-api</artifactId>
                <version>9.2.0</version>
            </dependency>
            <dependency>
                <groupId>org.eclipse.collections</groupId>
                <artifactId>eclipse-collections</artifactId>
                <version>9.2.0</version>
            </dependency>

        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>exchange.core2</groupId>
            <artifactId>exchange-core</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
        </dependency>

        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>webjars-locator-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>sockjs-client</artifactId>
            <version>1.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>stomp-websocket</artifactId>
            <version>2.3.3</version>
        </dependency>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>bootstrap</artifactId>
            <version>3.3.7</version>
        </dependency>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>jquery</artifactId>
            <version>3.1.0</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jsr310</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.8</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
        </dependency>

        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <!-- DATABASE PERSISTENCE -->
        <dependency>
            <groupId>org.hibernate.javax.persistence</groupId>
            <artifactId>hibernate-jpa-2.1-api</artifactId>
            <version>1.0.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.tomcat</groupId>
                    <artifactId>tomcat-jdbc</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-java8</artifactId>
        </dependency>
        <dependency>
            <groupId>org.flywaydb</groupId>
            <artifactId>flyway-core</artifactId>
        </dependency>
        <dependency>
            <groupId>com.zaxxer</groupId>
            <artifactId>HikariCP</artifactId>
            <version>${HikariCP.version}</version>
        </dependency>

        <!-- Eclipse (Goldman Sachs) collections -->
        <dependency>
            <groupId>org.eclipse.collections</groupId>
            <artifactId>eclipse-collections-api</artifactId>
        </dependency>
        <dependency>
            <groupId>org.eclipse.collections</groupId>
            <artifactId>eclipse-collections</artifactId>
        </dependency>

        <!-- tests -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-core</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <profiles>
        <profile>
            <id>default</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <build>
                <plugins>
                    <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-surefire-plugin</artifactId>
                    </plugin>
                </plugins>
            </build>
        </profile>

        <profile>
            <id>it</id>
            <build>
                <plugins>
                    <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-surefire-plugin</artifactId>
                        <configuration combine.self="override">
                            <!--<argLine>-XX:+PrintApplicationStoppedTime</argLine>-->
                            <redirectTestOutputToFile>true</redirectTestOutputToFile>
                            <includes>
                                <include>**/IT*.java</include>
                                <include>**/*IntegrationTest.java</include>
                            </includes>
                            <excludes>
                                <exclude>**/remote/**/*.class</exclude>
                                <exclude>**/stress/**/*.class</exclude>
                                <exclude>**/*Remote*Test.java</exclude>
                                <exclude>**/*Stress*Test.java</exclude>
                            </excludes>
                        </configuration>
                    </plugin>
                </plugins>
            </build>
        </profile>
    </profiles>

</project>

We call local dependency from this lines:

    <dependency>
        <groupId>exchange.core2</groupId>
        <artifactId>exchange-core</artifactId>
        <version>0.5.4-SNAPSHOT</version> //<-- changed the version here to the current one
    </dependency>

ANSWER

Answered 2020-Jul-03 at 02:34

Look at this: in mvn install:install-file command you wrote version=0.0.1-SNAPSHOT, whereas in pom.xml I see <version>0.5.4-SNAPSHOT</version>.

Source https://stackoverflow.com/questions/62706687

QUESTION

Amount of Threads with subtasks

Asked 2020-Apr-03 at 20:23

An optimum of threads in a pool is something that is case specific, though there is a rule of thumb which says #threads = #CPU +1. However, how does this work with threads spanning other threads and waiting (i.e. blocked until thread.join() is successful) for these 'subthreads'?

Assume that I have code that requires the execution of list of tasks (2), which has subtasks(2), which has subsubtasks(3) and so on. The total number of tasks is 2*2*3 = 12, though 18 threads will be created (because a threads will 'spawn' more subtasks (threads), where the thread spawning more threads will be blocked untill all is over. See below for pseudo code.

I am assuming that for a CPU with N cores there is a rule of thumb that everything can be parallelized if the highest number of active threads (12) is #CPU + 1. Is this correct?

PseudoCode

outputOfTask = []
for subtask in SubTaskList
   outputOfTask --> append(subtask.doCompute())
// wait untill all output is finished.

in subtask.java: Each subtask, for example, implements the same interface, but can be different.

   outputOfSubtask = []
    for task in subsubTaskList
        // do some magic depending on the type of subtask
        outputOfSubtask -> append( task.doCompute())
    return outputOfSubtask

in subsubtask.java:

 outputOfSubsubtask = []
    for task in subsubsubtask
        // do some magic depending on the type of subsubtask
        outputOfSubsubtask -> append( task.doCompute())
    return outputOfSubsubtask

EDIT: Dummy code Java code. I used this in my original question to check how many threads were active, but I assume that the pseudocode is more clear. Please note: I used the Eclipse Collection, this introduces the asParallel function which allows for a shorter notation of the code.

@Test
public void testasParallelthreads() {
    // // ExecutorService executor = Executors.newWorkStealingPool();
    ExecutorService executor = Executors.newCachedThreadPool();

    MutableList<Double> myMainTask = Lists.mutable.with(1.0, 2.0);
    MutableList<Double> mySubTask = Lists.mutable.with(1.0, 2.0);
    MutableList<Double> mySubSubTask = Lists.mutable.with(1.0, 2.0);
    MutableList<Double> mySubSubSubTask = Lists.mutable.with(1.0, 2.0, 2.0);

    MutableList<Double> a = myMainTask.asParallel(executor, 1)
            .flatCollect(task -> mySubTask.asParallel(executor,1)
            .flatCollect(subTask -> mySubSubTask.asParallel(executor, 1)
            .flatCollect(subsubTask   -> mySubSubSubTask.asParallel(executor, 1)
            .flatCollect(subsubTask -> dummyFunction(task, subTask, subsubTask, subsubTask,executor))
            .toList()).toList()).toList()).toList();        

    System.out.println("pool size: " + ((ThreadPoolExecutor) executor).getPoolSize());
    executor.shutdownNow();
}

private MutableList<Double> dummyFunction(double a, double b, double c, double d, ExecutorService ex) {
    System.out.println("ThreadId: " + Thread.currentThread().getId());
    System.out.println("Active threads size: " + ((ThreadPoolExecutor) ex).getActiveCount());
    return Lists.mutable.with(a,b,c,d);
}

ANSWER

Answered 2020-Apr-03 at 12:27

However, how does this work with threads spanning other threads and waiting (i.e. blocked until thread.join() is successful) for these 'subthreads'?

Threads will block, and it is up to the os/jvm to schedule another one if possible. If you have a single thread pool executor and call join from one of your tasks, the other task won't even get started. With executors that use more threads, then the blocking task will block a single thread and the os/jvm is free to scheduled other threads.

These blocked threads should not consume CPU time, because they are blocked. So I am assuming that for a CPU with N cores there is a rule of thumb that everything can be parallelized if the highest number of active threads (24) is #CPU + 1. Is this correct?

Active threads can be blocking. I think you're mixing terms here, #CPU, the number of cores, and the number of virtual cores. If you have N physical cores, then you can run N cpu bound tasks in parallel. When you have other types of blocking or very short lived tasks, then you can have more parallel tasks.

Source https://stackoverflow.com/questions/61010827

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

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Install eclipse-collections

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You can use eclipse-collections 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 eclipse-collections 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 .

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