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package org.glassfish.api.deployment;

import org.glassfish.api.container.Container;

/**
 * A deployer is capable of deploying one type of applications.
 *
 * Deployers should use the ArchiveHandler to get a ClassLoader capable of 
 * loading classes and resources from the archive type that is being deployed.
 *
 * In all cases the ApplicationContainer subclass must return the class loader 
 * associated with the application. In case the application is deployed to more 
 * than one container the class loader can be shared and therefore should be 
 * retrieved from the ArchiveHandler 
 *
 * @param  is the container type associated with this deployer
 * @param  is the ApplicationContainer implementation for this deployer
 * @author Jerome Dochez
 */
public interface Deployer {

    /**
     * Returns the meta data associated with this Deployer
     *
     * @return the meta data for this Deployer
     */
    public MetaData getMetaData();    

    /**
     * Loads the meta date associated with the application.
     *
     * @param type type of meta-data that this deployer has declared providing.
     * @return the meta-data of type V
     */
    public  V loadMetaData(Class type, DeploymentContext context);

    /**
     * Prepares the application bits for running in the application server. 
     * For certain cases, this is generating non portable artifacts and
     * other application specific tasks. 
     * Failure to prepare should throw an exception which will cause the overall
     * deployment to fail.
     *
     * @param context of the deployment
     * @return true if the prepare phase executed successfully
     */
    public boolean prepare(DeploymentContext context);
    
    /**
     * Loads a previously prepared application in its execution environment and 
     * return a ContractProvider instance that will identify this environment in
     * future communications with the application's container runtime.
     * @param container in which the application will reside
     * @param context of the deployment
     * @return an ApplicationContainer instance identifying the running application
     */
    public U load(T container, DeploymentContext context);
    
    /** 
     * Unload or stop a previously running application identified with the 
     * ContractProvider instance. The container will be stop upon return from this
     * method. 
     * @param appContainer instance to be stopped
     * @param context of the undeployment
     */
    public void unload(U appContainer, DeploymentContext context);
    
    /**
     * Clean any files and artifacts that were created during the execution 
     * of the prepare method. 
     * @param context deployment context
     */
    public void clean(DeploymentContext context);
}