org.apache.ambari.server.metadata

Class RoleCommandOrder

java.lang.Object

org.apache.ambari.server.metadata.RoleCommandOrder

All Implemented Interfaces:

Cloneable

public class RoleCommandOrder
extends Object
implements Cloneable

This class is used to establish the order between two roles. This class should not be used to determine the dependencies.

Field Summary

Fields

Modifier and Type	Field and Description
static String	COMMENT_STR
static String	GLUSTERFS_DEPS_KEY
static String	NAMENODE_HA_DEPS_KEY
static String	NO_GLUSTERFS_DEPS_KEY
static String	RESOURCEMANAGER_HA_DEPS_KEY

Constructor Summary

Constructors

Constructor and Description
RoleCommandOrder()

Method Summary

Modifier and Type	Method and Description
Object	clone()
int	compareDeps(RoleCommandOrder rco)
Map<RoleCommandPair,Set<RoleCommandPair>>	getDependencies() For test purposes
LinkedHashSet<String>	getSectionKeys() Gets the collection of section names that was used to initialize this RoleCommandOrder instance.
Set<Service>	getTransitiveServices(Service service, RoleCommand cmd) Returns transitive dependencies as a services list
void	initialize(Cluster cluster, LinkedHashSet<String> sectionKeys)
int	order(RoleGraphNode rgn1, RoleGraphNode rgn2) Returns the dependency order.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

GLUSTERFS_DEPS_KEY

public static final String GLUSTERFS_DEPS_KEY

See Also:

Constant Field Values

NO_GLUSTERFS_DEPS_KEY

public static final String NO_GLUSTERFS_DEPS_KEY

See Also:

Constant Field Values

NAMENODE_HA_DEPS_KEY

public static final String NAMENODE_HA_DEPS_KEY

See Also:

Constant Field Values

RESOURCEMANAGER_HA_DEPS_KEY

public static final String RESOURCEMANAGER_HA_DEPS_KEY

See Also:

Constant Field Values

COMMENT_STR

public static final String COMMENT_STR

See Also:

Constant Field Values

Constructor Detail

RoleCommandOrder

public RoleCommandOrder()

Method Detail

initialize

public void initialize(Cluster cluster,
                       LinkedHashSet<String> sectionKeys)

order

public int order(RoleGraphNode rgn1,
                 RoleGraphNode rgn2)

Returns the dependency order. -1 => rgn1 before rgn2, 0 => they can be parallel 1 => rgn2 before rgn1

Parameters:

rgn1 - roleGraphNode1

rgn2 - roleGraphNode2

getTransitiveServices

public Set<Service> getTransitiveServices(Service service,
                                          RoleCommand cmd)
                                   throws org.apache.ambari.server.AmbariException

Returns transitive dependencies as a services list

Parameters:

service - to check if it depends on another services

Returns:

tramsitive services

Throws:

org.apache.ambari.server.AmbariException

compareDeps

public int compareDeps(RoleCommandOrder rco)

getSectionKeys

public LinkedHashSet<String> getSectionKeys()

Gets the collection of section names that was used to initialize this RoleCommandOrder instance. If this instance has not been initialized, this will be null.

The ordering of this collection is maintained.

Returns:

the section keys used to initialize this instance or null if it has not been initialized.

getDependencies

public Map<RoleCommandPair,Set<RoleCommandPair>> getDependencies()

For test purposes

clone

public Object clone()
             throws CloneNotSupportedException

Overrides:

clone in class Object

Throws:

CloneNotSupportedException