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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012 Oracle and/or its affiliates. All rights reserved.
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 * 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
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
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 * GPL Classpath Exception:
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package org.glassfish.jersey.server.internal.process;

import javax.ws.rs.container.AsyncResponse;
import javax.ws.rs.core.Response;

import javax.inject.Inject;

import org.glassfish.jersey.internal.util.Producer;
import org.glassfish.jersey.internal.util.collection.Ref;
import org.glassfish.jersey.internal.util.collection.Value;

/**
 * Injectable asynchronous processing context that can be used to control various aspects
 * of asynchronous processing of a single request.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
public interface AsyncContext extends AsyncResponse {

    /**
     * {@link AsyncContext Asynchronous processing context} injection factory.
     */
    static class Factory implements org.glassfish.hk2.api.Factory {
        @Inject
        private Ref> contextValueRef;

        @Override
        public AsyncContext provide() {
            final Value contextValue = contextValueRef.get();
            return contextValue == null ? null : contextValue.get();
        }

        @Override
        public void dispose(AsyncContext instance) {
            // do nothing
        }
    }

    /**
     * Asynchronous processing context state.
     */
    public static enum State {

        /**
         * Indicates the asynchronous processing context is running. This is a default state
         * the processing context is in case the processing execution flow has not been explicitly
         * modified (yet).
         */
        RUNNING,
        /**
         * Indicates the asynchronous processing context has been suspended.
         *
         * @see AsyncContext#suspend()
         */
        SUSPENDED,
        /**
         * Indicates the asynchronous processing context has been resumed.
         */
        RESUMED,
        /**
         * Indicates the processing represented by this asynchronous processing context
         * has been completed.
         */
        COMPLETED,
    }

    /**
     * Suspend the current asynchronous processing context.
     *
     * The method returns {@code true} if the context has been successfully suspended,
     * {@code false} otherwise.
     *
     * @return {@code true} if the request processing has been suspended successfully suspended,
     *         {@code false} otherwise.
     */
    public boolean suspend();

    /**
     * Invoke the provided response producer in a Jersey-managed asynchronous thread.
     *
     * @param producer response producer.
     */
    public void invokeManaged(Producer producer);
}