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package org.glassfish.api.admin;

import org.glassfish.api.ActionReport;
import org.jvnet.hk2.annotations.Inject;
import org.jvnet.hk2.annotations.Service;

import java.lang.annotation.*;

/**
 * Annotation to qualify when an action like a command is targeted to be run
 * on a cluster or a set of instances.
 * 
 * Some actions may run only on DAS, or only on instances, by default they run
 * on both the DAS and the instances.
 *
 * @author Jerome Dochez
 */
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Target(ElementType.TYPE)
public @interface ExecuteOn {

    /**
     * Returns an array of process types on which the annotated action should run
     *
     * @return array of target process types
     */
    RuntimeType[] value() default { RuntimeType.DAS, RuntimeType.INSTANCE};

    /**
     * Identifies the {@link ClusterExecutor} that is responsible for remotely executing
     * commands on the target clusters or instances. The provider will be looked up
     * in the habitat by its type.
     * 
     * @return a {@link ClusterExecutor} type or null to use the default executor that takes the
     * "target" command parameter to 
     */
    Class<? extends ClusterExecutor> executor() default ExecuteOn.TargetBasedExecutor.class;


    /**
     * Identifies the expected behaviour from the framework if any of the clustered
     * invocation could not be invoked because the remote server was offline.
     *
     * @return the action the framework should perform if any of the remote invocation
     * of this command cannot be executed due to the server being offline.
     */
    FailurePolicy ifOffline() default FailurePolicy.Warn;

    /**
     * Identifies the expected behaviour from the framework if any of the clustered
     * invocation failed.
     *
     * @return the action the framework should perform if any of the remote invocation
     * of this command fails.
     */
    FailurePolicy ifFailure() default FailurePolicy.Error;


    /**
     * Convenience implementation that delegate to a provided system executor. This
     * provider will be looked up from the habitat by its type ClusterExecutor and the
     * "target" name. 
     */
    @Service
    final static class TargetBasedExecutor implements ClusterExecutor {

        @Inject(name="GlassFishClusterExecutor")
        private ClusterExecutor delegate=null;

        @Override
        public ActionReport.ExitCode execute(String commandName, AdminCommand command, AdminCommandContext context, ParameterMap parameters) {
            return delegate.execute(commandName, command, context, parameters);
        }
    }
}