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package org.glassfish.api.admin;
import org.glassfish.hk2.api.Metadata;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import javax.inject.Qualifier;
/**
* Annotation to define a supplemental command
*
* A supplemental command runs when a main command implementation is ran, it can be
* used to attach behaviours to existing commands without modifying the original
* implementation.
*
* A supplemental command can be very useful to configure extra or external components
* of an installation. For instance, a load-balancer module can be installed
* when a load-balancer is added to a glassfish installation. Such module can contain
* supplemental commands to supplement commands like "create-instance" in order to update
* the load-balancer specific information.
*
*
An implementation must use the value() attribute of the @Supplemental annotation
* to express the supplemented command. Its value is the name of the command as defined
* by the supplemented command @Service annotation.
*
*
Example : take a command implementation
*
*
* @Service(name="randomCommand")
* public MyRandomCommand implements AdminCommand {
* ...
* }
*
*
* a supplemental command may be defined as follows :
*
*
* @Service(name="mySupCommand")
* @Supplemental("randomCommand")
* public MySupplementalCommand implements AdminCommand {
* ...
* }
*
*
*
* Another implementation that does not use the same parameter names as the
* supplemented command will need to use a @Bridge annotation
*
*
* @Service(name="otherSupCommand")
* @Supplemental(value="randomCommand" bridge=MyParameterMapper.class)
* public OtherSupplementedCommand implements AdminCommand {
* ...
* }
*
*
* There can be several supplemental commands for a command implementation.
*
*
A supplemental command can be executed in "isolation" (not part of the supplemented
* command execution) and should not make any assumption that it is called as part
* of its supplemented command execution. If a command should not be invokable in
* isolation, it must not define a name() attribute on the @Service annotation :
*
*
* @Service
* @Supplemental("randomCommand")
* public MySupplementalCommand implements AdminCommand {
* // can only be invoked as a supplemental command
* }
*
*
* If a supplemental command is annotated with @Rollback, the annotation will be ignored
* when the supplemental command is executed in isolation.
*
*
If a supplemental command is annotated with @Rollback, it is still subject to the
* supplemented command {@link org.glassfish.api.admin.ExecuteOn#ifFailure()} value to decide
* whether or not roll-backing should happen in case of failure.
*
*
When associating a supplemental command to a command X, it's always a good idea
* to associate a roll-backing supplemental command to the rollbacking command of X.
* For instance, if an "add-lb-config" supplemental command is attached to the
* "create-instance" command, a "delete-lb-config" supplemental command should be
* attached to the "delete-instance" command.
*
* @author Jerome Dochez
*
*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Qualifier
public @interface Supplemental {
/**
* enumeration of when a supplemental command can be invoked with regards to the supplemented
* command execution.
*/
public enum Timing {Before, After, AfterReplication}
/**
* Name of the supplemented command as it can be looked up in the habitat. *
* Therefore the supplemented command must have the {@link AdminCommand} type and the
* provided registration name.
*
* @return habitat registration name for the command
*/
@Metadata("target")
public String value();
public Class bridge() default ParameterBridge.NoMapper.class;
/**
* Supplemental commands can be run before or after the supplemented command.
* Returns when this supplemental command is expecting its execution.
*
* @return Before if it should be run before the supplemented method
* or After if it should run after the supplemented method.
*/
public Timing on() default Timing.After;
/**
* Indicates to the framework what type of action should be taken if the
* execution of this command was to return a failure exit code.
* The action will apply on the supplemented command as well as all
* supplemental commands.
*
*
If rollback is expected, the failure of this
* supplemental command will cause the rollbacking of all the already
* executed supplemented commands as well as the main supplemented command.
*
* @return the action the framework is expected to invoke when this
* supplemental command execution failed.
*/
public FailurePolicy ifFailure() default FailurePolicy.Error;
}