initial

Author: rbygrave

.editorconfig

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+# editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+spaces_around_operators = true

.gitignore

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+target/
+build/
+.idea/
+*.iml
+.gradle

pom.xml

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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>io.kanuka</groupId>
+  <artifactId>kanuka</artifactId>
+  <version>0.1-SNAPSHOT</version>
+
+  <parent>
+    <groupId>org.avaje</groupId>
+    <artifactId>java8-parent</artifactId>
+    <version>1.3</version>
+  </parent>
+
+  <dependencies>
+
+    <dependency>
+      <groupId>javax.inject</groupId>
+      <artifactId>javax.inject</artifactId>
+      <version>1</version>
+    </dependency>
+
+  </dependencies>
+
+
+</project>

src/main/java/io/kanuka/BeanContext.java

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+package io.kanuka;
+
+import java.util.List;
+
+public interface BeanContext {
+
+  /**
+   * Return the name of the bean context.
+   */
+  String getName();
+
+  /**
+   * Return a single bean given the type.
+   */
+  <T> T getBean(Class<T> beanClass);
+
+  /**
+   * Return a single bean given the type and name.
+   */
+  <T> T getBean(Class<T> beanClass, String name);
+
+  /**
+   * Return the list of beans that implement the interface or are marked with the annotation.
+   *
+   * @param interfaceOrAnnotation An interface class or annotation class.
+   */
+  List<Object> getBeans(Class<?> interfaceOrAnnotation);
+}

src/main/java/io/kanuka/BootContext.java

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+package io.kanuka;
+
+import io.kanuka.core.BeanContextFactory;
+import io.kanuka.core.Builder;
+import io.kanuka.core.BuilderFactory;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.ServiceLoader;
+
+public class BootContext {
+
+  /**
+   * Load all the named contexts.
+   */
+  public BeanContext load() {
+
+    List<BeanContextFactory> factories = new ArrayList<>();
+    ServiceLoader.load(BeanContextFactory.class).forEach(factories::add);
+
+    // sort factories by dependsOn
+
+    Builder rootBuilder = BuilderFactory.newRootBuilder();
+
+    for (BeanContextFactory factory : factories) {
+      rootBuilder.addChild(factory.createContext(rootBuilder));
+    }
+
+    // entire graph built, fire postConstruct
+    rootBuilder.postConstruct();
+    return rootBuilder.build();
+  }
+
+}

src/main/java/io/kanuka/Context.java

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+package io.kanuka;
+
+import java.util.List;
+
+public class Context {
+
+  static BeanContext rootContext = init();
+
+  private static BeanContext init() {
+    return new BootContext().load();
+  }
+
+  public static <T> T getBean(Class<T> cls) {
+    return rootContext.getBean(cls);
+  }
+
+  public static <T> T getBean(Class<T> cls, String name) {
+    return rootContext.getBean(cls, name);
+  }
+
+  public static List<Object> getBeans(Class<?> cls) {
+    return rootContext.getBeans(cls);
+  }
+
+}

src/main/java/io/kanuka/ContextModule.java

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+package io.kanuka;
+
+public @interface ContextModule {
+
+  /**
+   * The name of the context.
+   */
+  String name() default "";
+
+  /**
+   * The list of dependencies this context depends on.
+   */
+  String[] dependsOn() default {};
+
+}

src/main/java/io/kanuka/core/BeanContextFactory.java

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+package io.kanuka.core;
+
+import io.kanuka.BeanContext;
+
+/**
+ * This is the service loader interface defining the bean contexts that can be created.
+ */
+public interface BeanContextFactory {
+
+  /**
+   * Return the name of the bean context this will create.
+   */
+  String name();
+
+  /**
+   * Create and return the BeanContext.
+   */
+  BeanContext createContext(Builder parent);
+}

src/main/java/io/kanuka/core/BeanLifeCycle.java

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+package io.kanuka.core;
+
+public interface BeanLifeCycle {
+
+  void postConstruct();
+
+  void preDestroy();
+}

src/main/java/io/kanuka/core/Builder.java

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+package io.kanuka.core;
+
+import io.kanuka.BeanContext;
+
+import java.util.Optional;
+
+/**
+ * Mutable object used when building the context.
+ */
+public interface Builder {
+
+  /**
+   * Return the name of the context this builder is creating (will be the BeanContext name).
+   */
+  String getName();
+
+  /**
+   * Set a parent builder that can provide cross-module dependencies.
+   */
+  void setParent(Builder parent);
+
+  /**
+   * Add a bean instance to the context.
+   *
+   * @param bean           The bean instance that has been created.
+   * @param name           The (optional) name of the instance.
+   * @param interfaceClass Interfaces and class level annotations this bean provides or associates to.
+   */
+  void addBean(Object bean, String name, String... interfaceClass);
+
+  /**
+   * Add a lifecycle bean.
+   */
+  void addLifecycle(BeanLifeCycle lifeCycleBean);
+
+  /**
+   * Add a child context.
+   */
+  void addChild(BeanContext context);
+
+  /**
+   * Set the type of the current bean being created (to assist in error messages when injecting dependencies).
+   */
+  void currentBean(String currentBean);
+
+  /**
+   * Get an optional dependency.
+   */
+  <T> Optional<T> getOptional(Class<T> cls);
+
+  /**
+   * Get an optional named dependency.
+   */
+  <T> Optional<T> getOptional(Class<T> cls, String name);
+
+  /**
+   * Get a dependency.
+   */
+  <T> T get(Class<T> cls);
+
+  /**
+   * Get a named dependency.
+   */
+  <T> T get(Class<T> cls, String name);
+
+  /**
+   * Fire post construct on all beans in the context.
+   */
+  void postConstruct();
+
+  /**
+   * Build and return the bean context.
+   */
+  BeanContext build();
+
+
+}

src/main/java/io/kanuka/core/BuilderFactory.java

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+package io.kanuka.core;
+
+public class BuilderFactory {
+
+  /**
+   * Create the root level Builder.
+   */
+  public static Builder newRootBuilder() {
+    return new DBuilder(null);
+  }
+
+  /**
+   * Create a Builder for the named context (module).
+   */
+  public static Builder newBuilder(String name) {
+    return new DBuilder(name);
+  }
+}

src/main/java/io/kanuka/core/DBeanContext.java

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+package io.kanuka.core;
+
+import io.kanuka.BeanContext;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+class DBeanContext implements BeanContext {
+
+  private final String name;
+
+  private final List<BeanLifeCycle> lifeCycleList;
+
+  private final Map<String, DContextEntry> beans;
+
+  private final Map<String, BeanContext> children;
+
+  DBeanContext(String name, List<BeanLifeCycle> lifeCycleList, Map<String, DContextEntry> beans, Map<String, BeanContext> children) {
+    this.name = name;
+    this.lifeCycleList = lifeCycleList;
+    this.beans = beans;
+    this.children = children;
+  }
+
+  @Override
+  public String getName() {
+    return name;
+  }
+
+  @Override
+  public <T> T getBean(Class<T> beanClass) {
+    return getBean(beanClass, null);
+  }
+
+  @Override
+  public <T> T getBean(Class<T> beanClass, String name) {
+    DContextEntry entry = beans.get(beanClass.getCanonicalName());
+    if (entry != null) {
+      T bean = (T) entry.get(name);
+      if (bean != null) {
+        return bean;
+      }
+    }
+    for (BeanContext childContext : children.values()) {
+      T bean = childContext.getBean(beanClass);
+      if (bean != null) {
+        return bean;
+      }
+    }
+    return null;
+  }
+
+  @Override
+  public List<Object> getBeans(Class<?> annCls) {
+
+    List<Object> list = new ArrayList<>();
+
+    DContextEntry entry = beans.get(annCls.getCanonicalName());
+    if (entry != null) {
+      entry.addAll(list);
+    }
+    for (BeanContext childContext : children.values()) {
+      list.addAll(childContext.getBeans(annCls));
+    }
+
+    return list;
+  }
+}