jedio

Uniform, fluent access to files, urls and other resources API for java, kotlin and scala.

Usage

ToDo

• check https://codehaus-plexus.github.io/plexus-utils/apidocs/org/codehaus/plexus/util/DirectoryScanner.html
• add deserializers
  • to specific implementations
  • to interfaces https://stackoverflow.com/questions/25387978/how-to-add-custom-deserializer-to-interface-using-jackson
• async first library
  • readContent should always do a readContentAsync.block to force reading async
  • readContentSync - forces reading in current thread
• ignore ssl validation
• copy meta info
  • for UrlLocations entire header and other details with suffix: .meta.json, -1.meta.json, etc.
  • other copy operation could describe the source of file?
• detect if a specific error is thrown multiple times and stop
• stop redirects in crawler - we will search for them in meta.json

Quasar/Comsat/Fibers config

• If quasar is needed the client should configure pom.xml to use quasar-agent

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <version>3.1.1</version>
        <executions>
          <execution>
            <id>one</id>
            <phase>prepare-package</phase>
            <goals>
              <goal>copy</goal>
            </goals>
            <configuration>
              <artifactItems>
                <artifactItem>
                  <groupId>co.paralleluniverse</groupId>
                  <artifactId>quasar-core</artifactId>
                  <classifier>jdk8</classifier>
                  <outputDirectory>${project.build.directory}</outputDirectory>
                  <destFileName>quasar-agent.jar</destFileName>
                </artifactItem>
              </artifactItems>
            </configuration>
          </execution>
          <execution>
            <id>second</id>
            <phase>prepare-package</phase>
            <goals>
              <goal>copy-dependencies</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>2.22.1</version>
        <configuration>
          <argLine>-javaagent:${co.paralleluniverse:quasar-core:jar}</argLine>
          <useSystemClassLoader>false</useSystemClassLoader>
        </configuration>
      </plugin>
    <!-- <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        <version>3.1.0</version>
        <configuration>
          <archive>
            <manifestEntries>
              <Premain-Class>co.paralleluniverse.fibers.instrument.JavaAgent</Premain-Class>
              <Agent-Class>co.paralleluniverse.fibers.instrument.JavaAgent</Agent-Class>
              <Can-Redefine-Classes>true</Can-Redefine-Classes>
              <Can-Retransform-Classes>true</Can-Retransform-Classes>
            </manifestEntries>
          </archive>
        </configuration>
      </plugin> -->

• This will run using the quasar agent (with it's own dependencies)

  mvn install -DskipTests
  java -javaagent:target/dependency/quasar-core-0.7.10-jdk8.jar -Xbootclasspath/a:target/dependency/kryo-serializers-0.42.jar;target/dependency/kryo-4.0.0.jar;target/dependency/guava-26.0-jre.jar -Dco.paralleluniverse.fibers.verifyInstrumentation=true -Dco.paralleluniverse.fibers.detectRunawayFibers=false -jar <yourapp>.jar --server.port=8080
  

• macOS run command:

  java -javaagent:target/dependency/quasar-core-0.7.10-jdk8.jar -Xbootclasspath/a:target/dependency/kryo-serializers-0.42.jar:target/dependency/kryo-4.0.0.jar:target/dependency/guava-26.0-jre.jar -Dco.paralleluniverse.fibers.detectRunawayFibers=false -jar <yourapp>.jar --server.port=8080 
  

Configure eclipse with quasar

Add quasar agent In 'Eclipse -> Preferences -> Java -> Intalled JREs -> edit your jre -> Default VM arguments' add this: (or after maven copies them in target/dependency: -javaagent:target/dependency/quasar-core-0.7.10-jdk8.jar -Xbootclasspath/a:target/dependency/kryo-serializers-0.42.jar;target/dependency/kryo-4.0.0.jar;target/dependency/guava-26.0-jre.jar -Dco.paralleluniverse.fibers.verifyInstrumentation=true ) old: -javaagent:C:\Users\$USERNAME\.m2\repository\co\paralleluniverse\quasar-core\0.7.10\quasar-core-0.7.10-jdk8.jar

• Fibers are good in blocking threards waiting for IO. If CPU is used too much errors are sent to System.error. In production you can add the following setting to disable it -Dco.paralleluniverse.fibers.detectRunawayFibers=false For more details see https://github.com/puniverse/quasar/blob/master/quasar-core/src/main/java/co/paralleluniverse/fibers/FiberTimedScheduler.java
• To disable CPU complain in fibers configure system properties to with -Dco.paralleluniverse.fibers.detectRunawayFibers=false

Maven

Dependency

<dependency>
  <groupId>org.raisercostin</groupId>
  <artifactId>jedio</artifactId>
  <version>0.1</version>
</dependency>

Repository

<repository>
  <id>raisercostin-github</id>
  <url>https://raw.githubusercontent.com/raisercostin/maven-repo/master/</url>
  <snapshots><enabled>false</enabled></snapshots>
</repository>

Other libraries

• scala - https://ammonite.io/#Ammonite-Ops
• https://golb.hplar.ch/2017/09/Pluggable-file-systems-in-Java.html

Development

• To release

  • npm run release-prepare
    npm run release-perform-local -- --releaseVersion 0.86