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robinhowlett / thread-pools.md
Created July 19, 2021 16:05 — forked from djspiewak/thread-pools.md

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

  1. CPU-bound
  2. Blocking IO
  3. Non-blocking IO polling

Each of these categories has a different optimal configuration and usage pattern.

@robinhowlett
robinhowlett / JsonPathTest
Created June 4, 2021 17:12
JBang.dev-compatible test for Jayway Json negative filters for empty strings
//DEPS com.jayway.jsonpath:json-path:2.1.0
import com.jayway.jsonpath.JsonPath;
import com.jayway.jsonpath.ReadContext;
import java.util.List;
public class JsonPathTest {
public static void main(String[] args) {
String json = "{\"phoneNumbers\": [\"a\", 1, false, \"\", null, \"hi\", -1]}";
ReadContext ctx = JsonPath.parse(json);
@robinhowlett
robinhowlett / double-initialization
Created May 15, 2019 20:58
[DEBUG] Created new class realm plugin>org.apache.maven.plugins:maven-deploy-plugin:2.8.2
...
[DEBUG] Created new class realm plugin>org.apache.maven.plugins:maven-deploy-plugin:2.8.2-1119294797
@robinhowlett
robinhowlett / reproduced
Created May 15, 2019 20:58
...
[INFO] --- maven-deploy-plugin:2.8.2:deploy (default-deploy) @ module-two ---
[INFO] Deploying com.snaplogic:module-two:1.0-SNAPSHOT at end
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] module-one ......................................... SUCCESS [ 3.477 s]
[INFO] pom-root ........................................... SUCCESS [ 0.228 s]
[INFO] module-two ......................................... SUCCESS [ 1.446 s]
[INFO] ------------------------------------------------------------------------
@robinhowlett
robinhowlett / mvn-clean-deploy_success
Created May 15, 2019 20:58
> mvn clean deploy
[MVNVM] Using maven: 3.5.2
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] module-one
[INFO] pom-root
[INFO] module-two
[INFO]
@robinhowlett
robinhowlett / pom_pluginrepositories_apache
Created May 15, 2019 20:58
<pluginRepositories>
<pluginRepository>
<id>apache.snapshots</id>
<name>Apache Snapshots</name>
<url>http://repository.apache.org/content/groups/snapshots-group/</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
@robinhowlett
robinhowlett / pom_pluginrepositories_local
Last active May 15, 2019 21:51
<pluginRepositories>
<pluginRepository>
<id>temp.repo</id>
<name>Temp Repo</name>
<url>file://${user.home}/.m2/temp-repository</url>
</pluginRepository>
</pluginRepositories>
@robinhowlett
robinhowlett / debug-maven-output-one
Created May 15, 2019 20:58
[DEBUG] Created new class realm plugin>org.apache.maven.plugins:maven-deploy-plugin:2.8.2
[DEBUG] Importing foreign packages into class realm plugin>org.apache.maven.plugins:maven-deploy-plugin:2.8.2
[DEBUG] Imported: < maven.api
[DEBUG] Populating class realm plugin>org.apache.maven.plugins:maven-deploy-plugin:2.8.2
[DEBUG] Included: org.apache.maven.plugins:maven-deploy-plugin:jar:2.8.2
[DEBUG] Included: backport-util-concurrent:backport-util-concurrent:jar:3.1
[DEBUG] Included: org.codehaus.plexus:plexus-interpolation:jar:1.11
[DEBUG] Included: junit:junit:jar:3.8.1
[DEBUG] Included: org.codehaus.plexus:plexus-utils:jar:3.0.15
[DEBUG] Configuring mojo org.apache.maven.plugins:maven-deploy-plugin:2.8.2:deploy from plugin realm ClassRealm[plugin>org.apache.maven.plugins:maven-deploy-plugin:2.8.2, parent: sun.misc.Launcher$AppClassLoader@3d4eac69]
@robinhowlett
robinhowlett / DeployMojo.java
Created May 15, 2019 20:58
/**
* When building with multiple threads, reaching the last project doesn't have to mean that all projects are ready
* to be deployed
*/
private static final AtomicInteger readyProjectsCounter = new AtomicInteger();
...
public void execute()
throws MojoExecutionException, MojoFailureException {
@robinhowlett
robinhowlett / debug-maven-output-two
Created May 15, 2019 20:58
[DEBUG] Created new class realm plugin>org.apache.maven.plugins:maven-deploy-plugin:2.8.2-932771130
[DEBUG] Importing foreign packages into class realm plugin>org.apache.maven.plugins:maven-deploy-plugin:2.8.2-932771130
[DEBUG] Imported: < maven.api
[DEBUG] Populating class realm plugin>org.apache.maven.plugins:maven-deploy-plugin:2.8.2-932771130
[DEBUG] Included: org.apache.maven.plugins:maven-deploy-plugin:jar:2.8.2
[DEBUG] Included: backport-util-concurrent:backport-util-concurrent:jar:3.1
[DEBUG] Included: org.codehaus.plexus:plexus-interpolation:jar:1.11
[DEBUG] Included: junit:junit:jar:3.8.1
[DEBUG] Included: org.codehaus.plexus:plexus-utils:jar:3.0.15
[DEBUG] Configuring mojo org.apache.maven.plugins:maven-deploy-plugin:2.8.2:deploy from plugin realm ClassRealm[plugin>org.apache.maven.plugins:maven-deploy-plugin:2.8.2-932771130, parent: sun.misc.Launcher$AppClassLoader@3d4eac69]