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/*
 * Copyright 2015 Async-IO.org
 *
 * 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.
 */
package org.atmosphere.config.service;

import org.atmosphere.cache.UUIDBroadcasterCache;
import org.atmosphere.client.TrackMessageSizeInterceptor;
import org.atmosphere.cpr.AtmosphereInterceptor;
import org.atmosphere.cpr.AtmosphereResourceEventListener;
import org.atmosphere.cpr.BroadcastFilter;
import org.atmosphere.cpr.Broadcaster;
import org.atmosphere.cpr.BroadcasterCache;
import org.atmosphere.cpr.DefaultBroadcaster;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * An annotation which acts like the {@link org.atmosphere.config.service.ManagedService} annotated resource, but
 * that can be used with frameworks like Jersey, Wicket or any framework running the Atmosphere Framework. The annotation
 * allow configuring Atmosphere's components like {@link Broadcaster}, {@link AtmosphereInterceptor}, etc.
 *
 * This annotation doesn't install any Atmosphere Component like {@link ManagedService}, {@link org.atmosphere.cpr.AtmosphereHandler}
 * or {@link org.atmosphere.websocket.WebSocketHandler}. The framework supporting the annotation must itself deploy an
 * Atmosphere's Service when specified, The {@link #servlet()} returned value will be used to install a
 * {@link org.atmosphere.handler.ReflectorServletProcessor} that will dispatch requests to the {@link javax.servlet.Servlet}.
 * You can customize the request dispatch by setting the {@link #dispatch()} to false. When set to false, the
 * {@link org.atmosphere.handler.ReflectorServletProcessor#onRequest(org.atmosphere.cpr.AtmosphereResource)} will never be invoked.
 *
 * By default, only the {@link org.atmosphere.client.TrackMessageSizeInterceptor} is installed.
 */
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface AtmosphereService {
    /**
     * Add {@link org.atmosphere.cpr.AtmosphereResourceEventListener} to track internal events.
     */
    public Class[] listeners() default {};

    /**
     * A list of {@link BroadcastFilter}
     */
    Class[] broadcastFilters() default {};

    /**
     * The {@link org.atmosphere.cpr.Broadcaster} class name
     *
     * @return The {@link org.atmosphere.cpr.Broadcaster} class name
     */
    Class broadcaster() default DefaultBroadcaster.class;

    /**
     * A list of {@link org.atmosphere.cpr.AtmosphereInterceptor} to install. Default are
     * {@link org.atmosphere.client.TrackMessageSizeInterceptor} and {@link org.atmosphere.interceptor.HeartbeatInterceptor}
     */
    Class[] interceptors() default {
            TrackMessageSizeInterceptor.class
    };

    /**
     * Atmosphere's configuration that will be passed to the associated {@link org.atmosphere.cpr.AtmosphereHandler}. Configuration
     * name and value is delimited by "=", and different configuration lines are separated by comma.
     */
    String[] atmosphereConfig() default {};

    /**
     * The {@link org.atmosphere.cpr.BroadcasterCache} class name
     *
     * @return The {@link org.atmosphere.cpr.Broadcaster} class name. Default is {@link org.atmosphere.cache.UUIDBroadcasterCache}
     */
    Class broadcasterCache() default UUIDBroadcasterCache.class;

    /**
     * The Servlet instance to instantiate at startup.
     */
    String servlet() default "";

    /**
     * The Servlet path instance to instantiate at startup.
     */
    String path() default "/";

    /**
     * Dispatch the managed {@link org.atmosphere.cpr.AtmosphereResource} to the mapped
     * {@link org.atmosphere.cpr.AtmosphereHandler#onRequest(org.atmosphere.cpr.AtmosphereResource)}. If set to false, no
     * HTTP GET operations will invoke the {@link org.atmosphere.handler.ReflectorServletProcessor#onRequest(org.atmosphere.cpr.AtmosphereResource)}.
     * The HTTP method can be customized using {@link org.atmosphere.cpr.ApplicationConfig#ATMOSPHERERESOURCE_INTERCEPTOR_METHOD} value via
     * {@link #atmosphereConfig}. If the {@link #servlet()} is undefined changing this value has no effect.
     */
    boolean dispatch() default true;
}