Initial commit

Author: Bill Bensing

.gitignore

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+target/
+.idea/

LICENSE

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+# The Kernel
+

README.md

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4" />

kernel.iml

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+<?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>com.wb3tech</groupId>
+    <artifactId>kernel</artifactId>
+    <version>0.1.0</version>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.target>1.13</maven.compiler.target>
+        <maven.compiler.source>1.13</maven.compiler.source>
+        <maven.compiler.release>13</maven.compiler.release>
+        <maven.compiler.plugin.version>3.8.1</maven.compiler.plugin.version>
+        <maven.surefire.plugin.version>3.0.0-M4</maven.surefire.plugin.version>
+        <junit.jupiter.version>5.6.0-M1</junit.jupiter.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${junit.jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven.compiler.plugin.version}</version>
+                <configuration>
+                    <source>${maven.compiler.source}</source>
+                    <target>${maven.compiler.target}</target>
+                    <release>${maven.compiler.release}</release>
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${maven.surefire.plugin.version}</version>
+            </plugin>
+        </plugins>
+    </build>
+
+    <distributionManagement>
+        <repository>
+            <id>github</id>
+            <name>GitHub WB3Tech Kernel - Apache Maven Packages</name>
+            <url>https://maven.pkg.github.com/WB3Tech-Kernel-Java/com.wb3tech.kernel</url>
+        </repository>
+    </distributionManagement>
+
+
+</project>

pom.xml

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+package com.wb3tech.kernel;
+
+public abstract class Entity implements Identifiable {
+
+    private Identity id;
+
+    protected void setId(Identity id) {
+        if (id == null) { throw new NullPointerException("The identity is null."); }
+        if (id.isInvalid()) { throw new IllegalStateException("The identity is not valid."); }
+        this.id = id.copy();
+    }
+
+    public Identity getId() {
+        return this.id.copy();
+    }
+
+    protected void assignNewIdentity() {
+        this.id = Identity.New();
+    }
+
+}

src/main/java/com/wb3tech/kernel/Entity.java

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+package com.wb3tech.kernel;
+
+public interface EventDispatcher<Event> {
+    void Dispatch(Event event);
+}

src/main/java/com/wb3tech/kernel/EventDispatcher.java

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+package com.wb3tech.kernel;
+
+public interface Identifiable {
+
+    Identity getId();
+}

src/main/java/com/wb3tech/kernel/Identifiable.java

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+package com.wb3tech.kernel;
+
+import java.util.UUID;
+
+/***
+ * Forms the basis for any identifiable entity for the WB3Tech kernel.
+ */
+public class Identity {
+
+    private UUID id;
+
+    Identity(UUID id) {
+        if (id == null) { throw new NullPointerException("Identity UUID cannot be null."); }
+        this.id = id;
+    }
+
+    /***
+     * Returns new instance with a value of 00000000-0000-0000-0000-000000000000.
+     * @return Identity
+     */
+    public static Identity Default() {
+        return new Identity(new UUID(0,0));
+    }
+
+    /***
+     * Returns new instance with a random value.
+     * @return Identity
+     */
+    public static Identity New() {
+        return new Identity(UUID.randomUUID());
+    }
+
+    /***
+     * Returns instance with a supplied UUID.
+     * @param id UUID
+     * @return Identity
+     */
+    public static Identity New(UUID id) {
+        return new Identity(id);
+    }
+
+    public boolean isValid()  {
+        return !this.id.toString().equals("00000000-0000-0000-0000-000000000000");
+    }
+
+    public boolean isInvalid()  {
+        return !this.isValid();
+    }
+
+    public boolean equals(Identity identity) {
+        if (this.isInvalid()) { throw new IllegalStateException("Cannot compare, current instance is in invalid."); }
+        if (identity.isInvalid()) { throw new IllegalStateException("Cannot compare, instance being compared is invalid."); }
+        return this.id.toString().equals(identity.toString());
+    }
+
+    public String toString() {
+        return this.id.toString();
+    }
+
+    public UUID value() {
+        return this.id;
+    }
+
+    protected Identity copy() {
+        return new Identity(this.id);
+    }
+
+}

src/main/java/com/wb3tech/kernel/Identity.java

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+package com.wb3tech.kernel;
+
+public interface RequestHandler<Request> {
+    void Handle(Request request);
+}