org.picocontainer.injectors.MethodInjector Maven / Gradle / Ivy
/*****************************************************************************
* Copyright (c) PicoContainer Organization. All rights reserved. *
* ------------------------------------------------------------------------- *
* The software in this package is published under the terms of the BSD *
* style license a copy of which has been included with this distribution in *
* the LICENSE.txt file. *
* *
*****************************************************************************/
package org.picocontainer.injectors;
import java.lang.annotation.Annotation;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import org.picocontainer.ComponentMonitor;
import org.picocontainer.LifecycleStrategy;
import org.picocontainer.Parameter;
import org.picocontainer.PicoCompositionException;
import org.picocontainer.PicoContainer;
import org.picocontainer.annotations.Nullable;
/**
* Injection will happen through a single method for the component.
*
* Most likely it is a method called 'inject', though that can be overridden.
*
* @author Paul Hammant
* @author Aslak Hellesøy
* @author Jon Tirsén
* @author Zohar Melamed
* @author Jörg Schaible
* @author Mauro Talevi
*/
@SuppressWarnings("serial")
public class MethodInjector extends SingleMemberInjector {
private transient ThreadLocalCyclicDependencyGuard instantiationGuard;
private final String methodName;
/**
* Creates a MethodInjector
*
* @param componentKey the search key for this implementation
* @param componentImplementation the concrete implementation
* @param parameters the parameters to use for the initialization
* @param monitor the component monitor used by this addAdapter
* @param methodName the method name
* @param useNames use argument names when looking up dependencies
* @throws AbstractInjector.NotConcreteRegistrationException
* if the implementation is not a concrete class.
* @throws NullPointerException if one of the parameters is null
*/
public MethodInjector(final Object componentKey, final Class componentImplementation, Parameter[] parameters, ComponentMonitor monitor,
String methodName, boolean useNames) throws AbstractInjector.NotConcreteRegistrationException {
super(componentKey, componentImplementation, parameters, monitor, useNames);
this.methodName = methodName;
}
protected Method getInjectorMethod() {
Method[] methods = new Method[0];
try {
methods = super.getComponentImplementation().getMethods();
} catch (AmbiguousComponentResolutionException e) {
e.setComponent(getComponentImplementation());
throw e;
}
for (Method method : methods) {
if (method.getName().equals(methodName)) {
return method;
}
}
return null;
}
@Override
public T getComponentInstance(final PicoContainer container, @SuppressWarnings("unused") Type into) throws PicoCompositionException {
if (instantiationGuard == null) {
instantiationGuard = new ThreadLocalCyclicDependencyGuard() {
@Override
@SuppressWarnings("synthetic-access")
public Object run() {
Method method = getInjectorMethod();
T inst = null;
ComponentMonitor componentMonitor = currentMonitor();
try {
componentMonitor.instantiating(container, MethodInjector.this, null);
long startTime = System.currentTimeMillis();
Object[] methodParameters = null;
inst = getComponentImplementation().newInstance();
if (method != null) {
methodParameters = getMemberArguments(guardedContainer, method);
invokeMethod(method, methodParameters, inst, container);
}
componentMonitor.instantiated(container, MethodInjector.this,
null, inst, methodParameters, System.currentTimeMillis() - startTime);
return inst;
} catch (InstantiationException e) {
return caughtInstantiationException(componentMonitor, null, e, container);
} catch (IllegalAccessException e) {
return caughtIllegalAccessException(componentMonitor, method, inst, e);
}
}
};
}
instantiationGuard.setGuardedContainer(container);
return (T) instantiationGuard.observe(getComponentImplementation());
}
protected Object[] getMemberArguments(PicoContainer container, final Method method) {
return super.getMemberArguments(container, method, method.getParameterTypes(), getBindings(method.getParameterAnnotations()));
}
@Override
public Object decorateComponentInstance(final PicoContainer container, @SuppressWarnings("unused") final Type into, final T instance) {
if (instantiationGuard == null) {
instantiationGuard = new ThreadLocalCyclicDependencyGuard() {
@Override
@SuppressWarnings("synthetic-access")
public Object run() {
Method method = getInjectorMethod();
if (method.getDeclaringClass().isAssignableFrom(instance.getClass())) {
Object[] methodParameters = getMemberArguments(guardedContainer, method);
return invokeMethod(method, methodParameters, instance, container);
}
return null;
}
};
}
instantiationGuard.setGuardedContainer(container);
Object o = instantiationGuard.observe(getComponentImplementation());
return o;
}
private Object invokeMethod(Method method, Object[] methodParameters, T instance, PicoContainer container) {
try {
Object rv = currentMonitor().invoking(container, MethodInjector.this, (Member) method, instance, methodParameters);
if (rv == ComponentMonitor.KEEP) {
long str = System.currentTimeMillis();
rv = method.invoke(instance, methodParameters);
currentMonitor().invoked(container, MethodInjector.this, method, instance, System.currentTimeMillis() - str, methodParameters, rv);
}
return rv;
} catch (IllegalAccessException e) {
return caughtIllegalAccessException(currentMonitor(), method, instance, e);
} catch (InvocationTargetException e) {
currentMonitor().invocationFailed(method, instance, e);
if (e.getTargetException() instanceof RuntimeException) {
throw (RuntimeException) e.getTargetException();
} else if (e.getTargetException() instanceof Error) {
throw (Error) e.getTargetException();
}
throw new PicoCompositionException(e);
}
}
@Override
public void verify(final PicoContainer container) throws PicoCompositionException {
if (verifyingGuard == null) {
verifyingGuard = new ThreadLocalCyclicDependencyGuard() {
@Override
public Object run() {
final Method method = getInjectorMethod();
final Class[] parameterTypes = method.getParameterTypes();
final Parameter[] currentParameters = parameters != null ? parameters : createDefaultParameters(parameterTypes);
for (int i = 0; i < currentParameters.length; i++) {
currentParameters[i].verify(container, MethodInjector.this, parameterTypes[i],
new ParameterNameBinding(getParanamer(), method, i), useNames(),
getBindings(method.getParameterAnnotations())[i]);
}
return null;
}
};
}
verifyingGuard.setGuardedContainer(container);
verifyingGuard.observe(getComponentImplementation());
}
@Override
public String getDescriptor() {
return "MethodInjector-";
}
@Override
protected boolean isNullParamAllowed(AccessibleObject member, int i) {
Annotation[] annotations = ((Method) member).getParameterAnnotations()[i];
for (Annotation annotation : annotations) {
if (annotation instanceof Nullable) {
return true;
}
}
return false;
}
public static class ByReflectionMethod extends MethodInjector {
private final Method injectionMethod;
public ByReflectionMethod(Object componentKey, Class componentImplementation, Parameter[] parameters, ComponentMonitor monitor, Method injectionMethod, boolean useNames) throws NotConcreteRegistrationException {
super(componentKey, componentImplementation, parameters, monitor, null, useNames);
this.injectionMethod = injectionMethod;
}
@Override
protected Method getInjectorMethod() {
return injectionMethod;
}
@Override
public String getDescriptor() {
return "ReflectionMethodInjector[" + injectionMethod + "]-";
}
}
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