CustomScopeContext.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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package com.oracle.hk2.devtest.cdi.ejb1.scoped;

import java.lang.annotation.Annotation;
import java.util.HashMap;
import java.util.Map;

import javax.inject.Singleton;

import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.Context;
import org.glassfish.hk2.api.ServiceHandle;
import org.jvnet.hk2.annotations.Service;

/**
 * The context implementation for CustomScope.  Does allow null value
 * returns.  Works more like Singleton than anything else, though it
 * does keep its own map, and hence can do better at shutdown
 * 
 * @author jwells
 *
 */
@Service
@Singleton
public class CustomScopeContext implements Context<CustomScope> {
    private final Map<ActiveDescriptor, Object> values =
            new HashMap<ActiveDescriptor, Object>();

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#getScope()
     */
    @Override
    public Class<? extends Annotation> getScope() {
        return CustomScope.class;
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#findOrCreate(org.glassfish.hk2.api.ActiveDescriptor, org.glassfish.hk2.api.ServiceHandle)
     */
    @Override
    public <U> U findOrCreate(ActiveDescriptor<U> activeDescriptor,
            ServiceHandle<?> root) {
        if (values.containsKey(activeDescriptor)) {
            return (U) values.get(activeDescriptor);
        }
        
        
        U retVal = activeDescriptor.create(root);
        values.put(activeDescriptor, retVal);
        return retVal;
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#containsKey(org.glassfish.hk2.api.ActiveDescriptor)
     */
    @Override
    public boolean containsKey(ActiveDescriptor<?> descriptor) {
        return values.containsKey(descriptor);
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#destroyOne(org.glassfish.hk2.api.ActiveDescriptor)
     */
    @Override
    public void destroyOne(ActiveDescriptor descriptor) {
        if (!values.containsKey(descriptor)) return;
        
        Object u = values.get(descriptor);
        descriptor.dispose(u);
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#supportsNullCreation()
     */
    @Override
    public boolean supportsNullCreation() {
        return true;
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#isActive()
     */
    @Override
    public boolean isActive() {
        return true;
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#shutdown()
     */
    @Override
    public void shutdown() {
        for (Map.Entry<ActiveDescriptor, Object> entry : values.entrySet()) {
            ActiveDescriptor ad = entry.getKey();
            Object value = entry.getValue();
            
            ad.dispose(value);
        }
        
        values.clear();

    }

}