org.apache.ambari.server.topology

Class HostGroupInfo

java.lang.Object

org.apache.ambari.server.topology.HostGroupInfo

public class HostGroupInfo
extends Object

Host Group information specific to a cluster instance.

Constructor Summary

Constructors

Constructor and Description
HostGroupInfo(String hostGroupName) Constructor

Method Summary

Modifier and Type	Method and Description
void	addHost(String hostName) Associate a single host name to the host group.
void	addHostRackInfo(String host, String rackInfo) Registers host rack information.
void	addHosts(Collection<String> hosts) Associate multiple host names to the host group.
Configuration	getConfiguration() Get the host group configuration associated with the host group.
String	getHostGroupName() Get the host group name.
Collection<String>	getHostNames() Get the collection of user specified host names for the host group.
Map<String,String>	getHostRackInfo() Returns a map with host names mapped to rack information.
Predicate	getPredicate() Get the compiled host predicate for the host group.
String	getPredicateString() Get the host predicate string for the host group.
int	getRequestedHostCount() Get the requested host count.
void	removeHost(String hostname) Removes hostname from group
void	setConfiguration(Configuration configuration) Set host group configuration for the host group.
void	setPredicate(String predicateString) Set the host predicate for the host group.
void	setRequestedCount(int num) Set the requested host count for the host group.

Methods inherited from class java.lang.Object

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

Constructor Detail

HostGroupInfo

public HostGroupInfo(String hostGroupName)

Constructor

Parameters:

hostGroupName - host group name

Method Detail

getHostGroupName

public String getHostGroupName()

Get the host group name.

Returns:

host group name

getHostNames

public Collection<String> getHostNames()

Get the collection of user specified host names for the host group. If the user specified a count instead of host names then an empty collection is returned.

Returns:

collection of user specified host names; will never be null

getRequestedHostCount

public int getRequestedHostCount()

Get the requested host count. This is either the user specified value or the number of explicitly specified host names specified by the user.

Returns:

number of requested hosts for the group

addHost

public void addHost(String hostName)

Associate a single host name to the host group.

Parameters:

hostName - the host name to associate with the host group

addHosts

public void addHosts(Collection<String> hosts)

Associate multiple host names to the host group.

Parameters:

hosts - collection of host names to associate with the host group

setRequestedCount

public void setRequestedCount(int num)

Set the requested host count for the host group.

Parameters:

num - requested host count

setConfiguration

public void setConfiguration(Configuration configuration)

Set host group configuration for the host group.

Parameters:

configuration - configuration instance

getConfiguration

public Configuration getConfiguration()

Get the host group configuration associated with the host group.

Returns:

associated host group scoped configuration or null if no configuration is specified for the host group

setPredicate

public void setPredicate(String predicateString)
                  throws InvalidQueryException

Set the host predicate for the host group.

Parameters:

predicateString - host predicate as a string

Throws:

InvalidQueryException - if compilation of the predicate fails

getPredicate

public Predicate getPredicate()

Get the compiled host predicate for the host group.

Returns:

the compiled host predicate or null if no predicate was specified

getPredicateString

public String getPredicateString()

Get the host predicate string for the host group.

Returns:

the host predicate string or null if no predicate was specified

addHostRackInfo

public void addHostRackInfo(String host,
                            String rackInfo)

Registers host rack information.

Parameters:

host - the name of the host

rackInfo - the rack information

getHostRackInfo

public Map<String,String> getHostRackInfo()

Returns a map with host names mapped to rack information.

Returns:

a copy of the current instance' rack information map

removeHost

public void removeHost(String hostname)

Removes hostname from group

Parameters:

hostname -