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package org.glassfish.api.admin;


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 executor() default 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 behavior from the framework if any of the clustered
     * invocation could not be invoked because the remote server has never been
     * started.
     *
     * @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 ifNeverStarted() default FailurePolicy.Ignore;

    /**
     * Identifies the expected behavior 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;
}