Example usage for org.springframework.beans.factory.support LookupOverride LookupOverride

Introduction

In this page you can find the example usage for org.springframework.beans.factory.support LookupOverride LookupOverride.

Prototype

public LookupOverride(Method method, @Nullable String beanName) 

Source Link

Document

Construct a new LookupOverride.

Usage

From source file:org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.java

@Override
@Nullable/*  w ww  .j  a  va 2 s.  c o  m*/
public Constructor<?>[] determineCandidateConstructors(Class<?> beanClass, final String beanName)
        throws BeanCreationException {

    // Let's check for lookup methods here..
    if (!this.lookupMethodsChecked.contains(beanName)) {
        try {
            ReflectionUtils.doWithMethods(beanClass, method -> {
                Lookup lookup = method.getAnnotation(Lookup.class);
                if (lookup != null) {
                    Assert.state(beanFactory != null, "No BeanFactory available");
                    LookupOverride override = new LookupOverride(method, lookup.value());
                    try {
                        RootBeanDefinition mbd = (RootBeanDefinition) beanFactory
                                .getMergedBeanDefinition(beanName);
                        mbd.getMethodOverrides().addOverride(override);
                    } catch (NoSuchBeanDefinitionException ex) {
                        throw new BeanCreationException(beanName,
                                "Cannot apply @Lookup to beans without corresponding bean definition");
                    }
                }
            });
        } catch (IllegalStateException ex) {
            throw new BeanCreationException(beanName, "Lookup method resolution failed", ex);
        }
        this.lookupMethodsChecked.add(beanName);
    }

    // Quick check on the concurrent map first, with minimal locking.
    Constructor<?>[] candidateConstructors = this.candidateConstructorsCache.get(beanClass);
    if (candidateConstructors == null) {
        // Fully synchronized resolution now...
        synchronized (this.candidateConstructorsCache) {
            candidateConstructors = this.candidateConstructorsCache.get(beanClass);
            if (candidateConstructors == null) {
                Constructor<?>[] rawCandidates;
                try {
                    rawCandidates = beanClass.getDeclaredConstructors();
                } catch (Throwable ex) {
                    throw new BeanCreationException(beanName,
                            "Resolution of declared constructors on bean Class [" + beanClass.getName()
                                    + "] from ClassLoader [" + beanClass.getClassLoader() + "] failed",
                            ex);
                }
                List<Constructor<?>> candidates = new ArrayList<>(rawCandidates.length);
                Constructor<?> requiredConstructor = null;
                Constructor<?> defaultConstructor = null;
                Constructor<?> primaryConstructor = BeanUtils.findPrimaryConstructor(beanClass);
                int nonSyntheticConstructors = 0;
                for (Constructor<?> candidate : rawCandidates) {
                    if (!candidate.isSynthetic()) {
                        nonSyntheticConstructors++;
                    } else if (primaryConstructor != null) {
                        continue;
                    }
                    AnnotationAttributes ann = findAutowiredAnnotation(candidate);
                    if (ann == null) {
                        Class<?> userClass = ClassUtils.getUserClass(beanClass);
                        if (userClass != beanClass) {
                            try {
                                Constructor<?> superCtor = userClass
                                        .getDeclaredConstructor(candidate.getParameterTypes());
                                ann = findAutowiredAnnotation(superCtor);
                            } catch (NoSuchMethodException ex) {
                                // Simply proceed, no equivalent superclass constructor found...
                            }
                        }
                    }
                    if (ann != null) {
                        if (requiredConstructor != null) {
                            throw new BeanCreationException(beanName, "Invalid autowire-marked constructor: "
                                    + candidate
                                    + ". Found constructor with 'required' Autowired annotation already: "
                                    + requiredConstructor);
                        }
                        boolean required = determineRequiredStatus(ann);
                        if (required) {
                            if (!candidates.isEmpty()) {
                                throw new BeanCreationException(beanName,
                                        "Invalid autowire-marked constructors: " + candidates
                                                + ". Found constructor with 'required' Autowired annotation: "
                                                + candidate);
                            }
                            requiredConstructor = candidate;
                        }
                        candidates.add(candidate);
                    } else if (candidate.getParameterCount() == 0) {
                        defaultConstructor = candidate;
                    }
                }
                if (!candidates.isEmpty()) {
                    // Add default constructor to list of optional constructors, as fallback.
                    if (requiredConstructor == null) {
                        if (defaultConstructor != null) {
                            candidates.add(defaultConstructor);
                        } else if (candidates.size() == 1 && logger.isWarnEnabled()) {
                            logger.warn("Inconsistent constructor declaration on bean with name '" + beanName
                                    + "': single autowire-marked constructor flagged as optional - "
                                    + "this constructor is effectively required since there is no "
                                    + "default constructor to fall back to: " + candidates.get(0));
                        }
                    }
                    candidateConstructors = candidates.toArray(new Constructor<?>[candidates.size()]);
                } else if (rawCandidates.length == 1 && rawCandidates[0].getParameterCount() > 0) {
                    candidateConstructors = new Constructor<?>[] { rawCandidates[0] };
                } else if (nonSyntheticConstructors == 2 && primaryConstructor != null
                        && defaultConstructor != null && !primaryConstructor.equals(defaultConstructor)) {
                    candidateConstructors = new Constructor<?>[] { primaryConstructor, defaultConstructor };
                } else if (nonSyntheticConstructors == 1 && primaryConstructor != null) {
                    candidateConstructors = new Constructor<?>[] { primaryConstructor };
                } else {
                    candidateConstructors = new Constructor<?>[0];
                }
                this.candidateConstructorsCache.put(beanClass, candidateConstructors);
            }
        }
    }
    return (candidateConstructors.length > 0 ? candidateConstructors : null);
}

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From source file:org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.java

/**
 * Parse lookup-override sub-elements of the given bean element.
 *///  w w w  .  j  a v a  2s  .  c o  m
public void parseLookupOverrideSubElements(Element beanEle, MethodOverrides overrides) {
    NodeList nl = beanEle.getChildNodes();
    for (int i = 0; i < nl.getLength(); i++) {
        Node node = nl.item(i);
        if (isCandidateElement(node) && nodeNameEquals(node, LOOKUP_METHOD_ELEMENT)) {
            Element ele = (Element) node;
            String methodName = ele.getAttribute(NAME_ATTRIBUTE);
            String beanRef = ele.getAttribute(BEAN_ELEMENT);
            LookupOverride override = new LookupOverride(methodName, beanRef);
            override.setSource(extractSource(ele));
            overrides.addOverride(override);
        }
    }
}

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From source file:org.springframework.beans.factory.xml.DefaultXmlBeanDefinitionParser.java

/**
 * Parse lookup-override sub-elements of the given bean element.
 *//*from  www  .j a  v a  2s.c om*/
protected void parseLookupOverrideSubElements(Element beanEle, String beanName, MethodOverrides overrides)
        throws BeanDefinitionStoreException {

    NodeList nl = beanEle.getChildNodes();
    for (int i = 0; i < nl.getLength(); i++) {
        Node node = nl.item(i);
        if (node instanceof Element && LOOKUP_METHOD_ELEMENT.equals(node.getNodeName())) {
            Element ele = (Element) node;
            String methodName = ele.getAttribute(NAME_ATTRIBUTE);
            String beanRef = ele.getAttribute(BEAN_ELEMENT);
            overrides.addOverride(new LookupOverride(methodName, beanRef));
        }
    }
}

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