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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.di.componentgraph.core;
import com.google.inject.Key;
import com.yahoo.component.ComponentId;
import com.yahoo.config.ConfigInstance;
import com.yahoo.container.di.componentgraph.Provider;
import com.yahoo.vespa.config.ConfigKey;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.logging.Logger;
import static com.yahoo.log.LogLevel.DEBUG;
import static com.yahoo.log.LogLevel.SPAM;
/**
* @author Tony Vaagenes
* @author gjoranv
* @author ollivir
*/
public abstract class Node {
private final static Logger log = Logger.getLogger(Node.class.getName());
private final ComponentId componentId;
protected Optional<Object> instance = Optional.empty();
List<Node> componentsToInject = new ArrayList<>();
public Node(ComponentId componentId) {
this.componentId = componentId;
}
public abstract Key<?> instanceKey();
/**
* The components actually used by this node. Consist of a subset of the injected nodes + subset of the global nodes.
*/
public abstract List<Node> usedComponents();
protected abstract Object newInstance();
public Object newOrCachedInstance() {
Object inst;
if (instance.isPresent()) {
inst = instance.get();
log.log(SPAM, "Reusing instance for component with ID " + componentId);
} else {
log.log(DEBUG, "Creating new instance for component with ID " + componentId);
inst = newInstance();
instance = Optional.of(inst);
}
return component(inst);
}
private Object component(Object instance) {
if (instance instanceof Provider) {
Provider<?> provider = (Provider<?>) instance;
return provider.get();
} else {
return instance;
}
}
public abstract Set<ConfigKey<ConfigInstance>> configKeys();
public void inject(Node component) {
componentsToInject.add(component);
}
public void injectAll(Collection<ComponentNode> componentNodes) {
componentNodes.forEach(this::inject);
}
public abstract Class<?> instanceType();
public abstract Class<?> componentType();
public abstract String label();
public String idAndType() {
String className = instanceType().getName();
if (className.equals(componentId.getName())) {
return "'" + componentId + "'";
} else {
return "'" + componentId + "' of type '" + className + "'";
}
}
private static boolean equalNodes(Object a, Object b) {
if (a instanceof Node && b instanceof Node) {
Node l = (Node) a;
Node r = (Node) b;
return l.componentId.equals(r.componentId);
} else {
return a.equals(b);
}
}
public static boolean equalEdges(List<?> edges1, List<?> edges2) {
Iterator<?> right = edges2.iterator();
for (Object l : edges1) {
if (!right.hasNext()) {
return false;
}
Object r = right.next();
if (!equalNodes(l, r)) {
return false;
}
}
return !right.hasNext();
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((componentId == null) ? 0 : componentId.hashCode());
result = prime * result + ((componentsToInject == null) ? 0 : componentsToInject.hashCode());
return result;
}
@Override
public boolean equals(Object other) {
if (other instanceof Node) {
Node that = (Node) other;
return getClass().equals(that.getClass()) && this.componentId.equals(that.componentId)
&& this.instanceType().equals(that.instanceType()) && equalEdges(this.usedComponents(), that.usedComponents());
} else {
return false;
}
}
public ComponentId componentId() {
return componentId;
}
public Optional<?> instance() {
return instance;
}
/**
* @param identityObject
* The identifying object that makes the Node unique
*/
protected static ComponentId syntheticComponentId(String className, Object identityObject, ComponentId namespace) {
String name = className + "_" + System.identityHashCode(identityObject);
return ComponentId.fromString(name).nestInNamespace(namespace);
}
public static String packageName(Class<?> componentClass) {
String fullClassName = componentClass.getName();
int index = fullClassName.lastIndexOf('.');
if (index < 0) {
return "";
} else {
return fullClassName.substring(0, index);
}
}
}
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