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// Portions Copyright [2016-2021] [Payara Foundation and/or its affiliates]

/*
 * InstanceResolverImpl.java
 *
 * Created on May 29, 2007, 10:41 AM
 *
 * @author Mike Grogan
 */

package org.glassfish.webservices;
import com.sun.istack.NotNull;
import com.sun.xml.ws.api.message.Packet;
import com.sun.xml.ws.api.server.ResourceInjector;
import com.sun.xml.ws.api.server.InstanceResolver;
import com.sun.xml.ws.api.server.WSEndpoint;
import com.sun.xml.ws.api.server.WSWebServiceContext;
import com.sun.xml.ws.api.server.Invoker;
import com.sun.enterprise.container.common.spi.util.InjectionManager;
import com.sun.enterprise.container.common.spi.util.InjectionException;

import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
import jakarta.xml.ws.Provider;
import jakarta.xml.ws.WebServiceException;


public final class InstanceResolverImpl extends InstanceResolver {
   
    //delegate to this InstanceResolver
    private volatile InstanceResolver resolver;
    private T instance;
    private final Class classtobeResolved;

    private WSWebServiceContext wsc;
    private WSEndpoint endpoint;

    private final InjectionManager injManager = WebServiceContractImpl.getInstance().getInjectionManager();

    public  InstanceResolverImpl(@NotNull Class clasz) {
        this.classtobeResolved = clasz;
    }

    @Override
    public @NotNull T resolve(Packet request) {
        //See iss 9721
        //Injection and instantiation is now done lazily
        return getResolver().resolve(request);
    }

    private InstanceResolver getResolver() {
        // proper double check to ensure single initialization
        InstanceResolver res = resolver;
        if (res == null) {
            synchronized(this) {
                res = resolver;
                if (res == null) {
                    resolver = res = initResolver();
                }            
            }
        }
        return res;
    }

    private InstanceResolver initResolver() {
         try {
            //Bug18998101. inject() call below also calls @PostConstruct method.
            instance = injManager.createManagedObject(classtobeResolved, false);
        } catch (InjectionException e) {
            throw new WebServiceException(e);
        }
        getResourceInjector(endpoint).inject(wsc, instance);
        return InstanceResolver.createSingleton(instance);
    }

    @Override
    public void start(WSWebServiceContext wsc, WSEndpoint endpoint) {
        this.wsc = wsc;
        this.endpoint = endpoint;
    }

    @Override
    public void dispose() {
        try {
            if(instance != null) {//instance can be null as it is created laziily
                injManager.destroyManagedObject(instance);
            }
        } catch (InjectionException e) {
            throw new WebServiceException(e);
        }
    }
    
    private ResourceInjector getResourceInjector(WSEndpoint endpoint) {
        ResourceInjector ri = endpoint.getContainer().getSPI(ResourceInjector.class);
        if (ri == null) {
            ri = ResourceInjector.STANDALONE;
        }
        return ri;
    }
    
     /**
     * Wraps this {@link InstanceResolver} into an {@link Invoker}.
     */
	public  //TODO - make this package private.  Cannot do it until this method is removed from base
		//       class com.sun.xml.ws.api.server.InstanceResolver
     @Override
     @NotNull Invoker createInvoker() {
        return new Invoker() {
            @Override
            public void start(@NotNull WSWebServiceContext wsc, @NotNull WSEndpoint endpoint) {
                InstanceResolverImpl.this.start(wsc,endpoint);
            }

            @Override
            public void dispose() {
                InstanceResolverImpl.this.dispose();
            }

            @Override
            public Object invoke(Packet p, Method m, Object... args) throws InvocationTargetException, IllegalAccessException {
                return m.invoke( resolve(p), args );
            }

            @Override
            public  T invokeProvider(@NotNull Packet p, T arg) {
                return ((Provider)resolve(p)).invoke(arg);
            }

            @Override
            public String toString() {
                return "Default Invoker over "+InstanceResolverImpl.this.toString();
            }
        };
    }
}