org.glassfish.hk2.configuration.internal.ConfiguredByContext Maven / Gradle / Ivy

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * 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
 * or packager/legal/LICENSE.txt.  See the License for the specific
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 * GPL Classpath Exception:
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 */
package org.glassfish.hk2.configuration.internal;

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

import javax.inject.Singleton;

import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.Context;
import org.glassfish.hk2.api.DescriptorVisibility;
import org.glassfish.hk2.api.MultiException;
import org.glassfish.hk2.api.ServiceHandle;
import org.glassfish.hk2.api.Visibility;
import org.glassfish.hk2.configuration.api.ConfiguredBy;

/**
 * @author jwells
 *
 */
@Singleton
@Visibility(DescriptorVisibility.LOCAL)
public class ConfiguredByContext implements Context {
    private final static ThreadLocal> workingOn = new ThreadLocal>() {
        public ActiveDescriptor initialValue() {
            return null;
        }
        
    };
    
    private final Object lock = new Object();
    private final HashMap, Object> db = new HashMap, Object>();

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#getScope()
     */
    @Override
    public Class getScope() {
        return ConfiguredBy.class;
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#findOrCreate(org.glassfish.hk2.api.ActiveDescriptor, org.glassfish.hk2.api.ServiceHandle)
     */
    @SuppressWarnings("unchecked")
    @Override
    public  U findOrCreate(ActiveDescriptor activeDescriptor,
            ServiceHandle root) {
        ActiveDescriptor previousValue = (ActiveDescriptor) workingOn.get();
        workingOn.set(activeDescriptor);
        try {
            return internalFindOrCreate(activeDescriptor, root);
        }
        finally {
            workingOn.set(previousValue);
        }
    }
    
    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#findOrCreate(org.glassfish.hk2.api.ActiveDescriptor, org.glassfish.hk2.api.ServiceHandle)
     */
    @SuppressWarnings("unchecked")
    private  U internalFindOrCreate(ActiveDescriptor activeDescriptor,
            ServiceHandle root) {
        synchronized (lock) {
            U retVal = (U) db.get(activeDescriptor);
            if (retVal != null) return retVal;
            
            if (activeDescriptor.getName() == null) {
                throw new MultiException(new IllegalStateException("ConfiguredBy services without names are templates and cannot be created directly"));
            }
            
            retVal = activeDescriptor.create(root);
            db.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) {
        synchronized (lock) {
            return db.containsKey(descriptor);
        }
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#destroyOne(org.glassfish.hk2.api.ActiveDescriptor)
     */
    @SuppressWarnings("unchecked")
    @Override
    public void destroyOne(ActiveDescriptor descriptor) {
        synchronized (lock) {
            Object destroyMe = db.remove(descriptor);
            if (destroyMe == null) return;
            
            ((ActiveDescriptor