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    • org.nnsoft.guice.lifegycle.AfterInjectionModule Maven / Gradle / Ivy

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    package org.nnsoft.guice.lifegycle;

/*
 *  Copyright 2012 The 99 Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

import com.google.inject.ProvisionException;
import com.google.inject.matcher.Matcher;
import com.google.inject.spi.InjectionListener;
import com.google.inject.spi.TypeEncounter;

import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import static java.lang.String.format;

/**
 * Guice module to register methods to be invoked after injection is complete.
 */
public final class AfterInjectionModule
        extends AbstractLifeCycleModule {
    /**
     * Creates a new module which register methods annotated with {@link AfterInjection} on methods
     * in any type.
     */
    public AfterInjectionModule() {
        super(AfterInjection.class);
    }

    /**
     * Creates a new module which register methods annotated with input annotation on methods in
     * types filtered by the input matcher.
     *
     * @param afterInjectionAnnotationType the AfterInjection annotation to be searched.
     * @param typeMatcher the filter for injectee types.
     */
    public  AfterInjectionModule(final Class afterInjectionAnnotationType,
            final Matcher typeMatcher) {
        super(afterInjectionAnnotationType, typeMatcher);
    }

    @Override
    protected void configure() {
        bindListener(getTypeMatcher(), new AbstractMethodTypeListener(getAnnotationType()) {
            @Override
            protected  void hear(final Method method, final TypeEncounter encounter) {
                encounter.register((InjectionListener) injectee -> {
                    try {
                        method.invoke(injectee);
                    } catch (final IllegalArgumentException e) {
                        // should not happen, anyway...
                        throw new ProvisionException(format("Method @%s %s requires arguments",
                                getAnnotationType().getName(), method), e);
                    } catch (final IllegalAccessException e) {
                        throw new ProvisionException(format("Impossible to access to @%s %s on %s",
                                getAnnotationType().getName(), method, injectee), e);
                    } catch (final InvocationTargetException e) {
                        throw new ProvisionException(
                                format("An error occurred while invoking @%s %s on %s",
                                        getAnnotationType().getName(), method, injectee),
                                e.getTargetException());
                    }
                });
            }
        });
    }
}
    
    
    
    

    




    
    
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