org.gridgain.grid.spi.communication.mail
Class GridMailCommunicationSpi

java.lang.Object
  org.gridgain.grid.spi.GridSpiAdapter
      org.gridgain.grid.spi.communication.mail.GridMailCommunicationSpi

All Implemented Interfaces:

GridCommunicationSpi, GridMailCommunicationSpiMBean, GridSpi, GridSpiManagementMBean

@GridSpiInfo(author="GridGain Systems",
             url="www.gridgain.org",
             email="support@gridgain.com",
             version="x.x")
@GridSpiMultipleInstancesSupport(value=true)
public class GridMailCommunicationSpi
extends GridSpiAdapter
implements GridCommunicationSpi, GridMailCommunicationSpiMBean

Email implementation of GridCommunicationSpi. Email communication is provided for cases where nodes from different networks (even different countries) need to participate in grid task execution together as it usually can penetrate through any firewall. It supports SMTP/POP and IMAP email access protocols and can be used to connect to any public or private email server out there.

When working with email communication, make sure that maximum send/receive limit set by mail server is not exceeded. Sometimes it is better to configure your own mail server to avoid such limitations.

Note, that due to its nature mail communication is much slower than other implementations of communication SPI's and measures communication delays in minutes rather than in seconds. This means that execution of some tasks can fail more often than with other SPI's due to nodes leaving grid topology. In most cases user should implement a custom failover resolution in GridTask implementation, which should check if a node is still alive using Grid.pingNode(UUID) method. Use this SPI whenever it is acceptable to react to node topology changes with substantial delay.

Configuration

Mandatory

The following configuration parameters are mandatory:

• Outgoing host (see GridMailCommunicationSpi.setOutHost(String)).
• Ingoing host (see GridMailCommunicationSpi.setInHost(String)).
• Address from (see GridMailCommunicationSpi.setFromAddress(String)).

Optional

The following configuration parameters are optional.

• Outgoing connection type (see GridMailCommunicationSpi.setOutConnectionType(GridMailCommunicationType))
• Outgoing port (see GridMailCommunicationSpi.setOutPort(int)
• Outgoing user name (see GridMailCommunicationSpi.setOutUsername(String)
• Outgoing user password (see GridMailCommunicationSpi.setOutPassword(String)
• Outgoing additional JavaMail properties (see GridMailCommunicationSpi.setOutCustomProperties(Properties)
• Outgoing protocol (see GridMailCommunicationSpi.setOutProtocol(GridMailCommunicationOutProtocol)
• Ingoing connection type (see GridMailCommunicationSpi.setInConnectionType(GridMailCommunicationType)
• Ingoing port (see GridMailCommunicationSpi.setInPort(int)
• Ingoing user name (see GridMailCommunicationSpi.setInUsername(String)
• Ingoing user password (see GridMailCommunicationSpi.setInPassword(String)
• Ingoing additional JavaMail properties (see GridMailCommunicationSpi.setInCustomProperties(Properties)
• Ingoing protocol (see GridMailCommunicationSpi.setInProtocol(GridMailCommunicationInProtocol)
• Mail subject (see GridMailCommunicationSpi.setSubject(String)
• Mail folder name (see GridMailCommunicationSpi.setFolderName(String)
• Locally stored file name (see GridMailCommunicationSpi.setStoreFileName(String)
• Read messages batch size (see GridMailCommunicationSpi.setReadBatchSize(int)
• Delay between messages read (see GridMailCommunicationSpi.setReceiverDelay(long)
• Number of milliseconds to leave messages on server (see GridMailCommunicationSpi.setLeaveMessagesOnServer(long)

Java Example

GridMailCommunicationSpi needs to be explicitely configured:

 GridMailCommuncationSpi commSpi = new GridMailCommuncationSpi();

 // Inbox configuration.
 commSpi.setInHost("pop.google.com");

 // Outbox configuration.
 commSpi.setOutHost("smtp.google.com");

 // Incoming/outgoing e-mail address configuration.
 commSpi.setFromAddress("grid@google.com");

 GridConfigurationAdapter cfg = new GridConfigurationAdapter();

 // Override default communication SPI.
 cfg.setCommunicationSpi(commSpi);

 // Start grid.
 GridFactory.start(cfg);
 

Spring Example

GridMailCommunicationSpi can be configured from Spring XML configuration file:

 <bean id="grid.custom.cfg" class="org.gridgain.grid.GridConfigurationAdapter" singleton="true">
         ...
         <property name="communicationSpi">
             <bean class="org.gridgain.grid.spi.communication.mail.GridMailCommunicationSpi">
                 <property name="outHost" value="smtp.google.com"/>
                 <property name="inHost" value="pop.google.com"/>
                 <property name="fromAddress" value="grid@google.com"/>
             </bean>
         </property>
         ...
 </bean>
 

For information about Spring framework visit www.springframework.org



See Also:

Documentation
Email Support
Online Forums
Issue Tracking

Author: 2005-2008 Copyright © GridGain Systems. All Rights Reserved. ver. 2.1.0

	Nikita Ivanov, GridGain Systems nivanov@gridgain.com
	Dmitriy Setrakyan, GridGain Systems dsetrakyan@gridgain.com
	Alexander Magdenko, GridGain Systems amagdenko@gridgain.com
	Boris Suchodoev, GridGain Systems bsuchodoev@gridgain.com
	Denis Kharlamov, GridGain Systems dkharlamov@gridgain.com
	close

See Also:

GridCommunicationSpi

Field Summary

static String	ATTR_EMAIL_ADDR Node email address attribute name (value is comm.email.address).
static long	DFLT_LEAVE_MSGS_ON_SERVER Leave messages on server in milliseconds (value is 86400000).
static long	DFLT_RECEIVER_DELAY Delay in milliseconds between receiving email (value is 10000).
static String	DFLT_STORE_FILE_NAME Default local storage file name (value is grid-email-comm-msgs.dat).
static String	DFLT_SUBJ Default subject of email (value is grid.email.comm.msg).

Constructor Summary

GridMailCommunicationSpi()
Set SPI default values for mailboxes configurations.

Method Summary

protected List<String>	getConsistentAttributeNames() Returns back list of attributes that should be consistent for this SPI.
String	getFolderName() Gets folder name of email folder on mail server.
String	getFromAddress() Gets message field 'From' all email messages.
String	getInConnectionTypeFormatted() Gets type of incoming mail connection.
Properties	getInCustomProperties() Gets custom properties required for receiving connection.
String	getInHost() Gets incoming host name for receiving email (usually either POP or IMAP).
int	getInPort() Gets incoming host port number for receiving email.
String	getInProtocolFormatted() Sets incoming mail protocol.
String	getInUsername() Gets incoming host username for receiving email.
long	getLeaveMessagesOnServer() Gets incoming messages life-time on mail server in milliseconds.
Map<String,Serializable>	getNodeAttributes() This method is called before SPI starts (before method GridSpi.spiStart(String) is called). It allows SPI implementation to add attributes to a local node. Kernel collects these attributes from all SPI implementations loaded up and then passes it to discovery SPI so that they can be exchanged with other nodes.
String	getOutConnectionTypeFormatted() Gets type of outgoing mail connection.
Properties	getOutCustomProperties() Gets custom properties required for outgoing connection.
String	getOutHost() Gets outgoing host name for sending email (usually either SMTP or IMAP).
int	getOutPort() Gets port number for outgoing mail.
String	getOutProtocolFormatted() Gets outgoing mail protocol.
String	getOutUsername() Gets username for outgoing mail authentication.
int	getReadBatchSize() Gets number of messages fetched from mail server at a time.
long	getReceiverDelay() Gets interval in milliseconds between checking for new messages.
String	getStoreFileName() Gets locally stored full file name for all read messages.
String	getSubject() Gets email message subject.
void	sendMessage(Collection<GridNode> destNodes, Serializable msg) Sends given message to destination nodes.
void	sendMessage(GridNode destNode, Serializable msg) Sends given message to destination node.
void	setFolderName(String folderName) Sets name of email folder on mail server.
void	setFromAddress(String addr) Sets 'From' address for all email messages.
void	setInConnectionType(GridMailCommunicationType type) Sets type of incoming mail connection which should be one of the following: GridMailCommunicationType.NONE GridMailCommunicationType.SSL GridMailCommunicationType.STARTTLS If not provided, default value is GridMailCommunicationType.NONE.
void	setInCustomProperties(Properties props) Sets any custom properties required for receiving connection.
void	setInHost(String host) Sets incoming host name for receiving emails (usually either POP or IMAP).
void	setInPassword(String pswd) Sets password for incoming mail authentication.
void	setInPort(int port) Sets port number for incoming mail.
void	setInProtocol(GridMailCommunicationInProtocol proto) Sets incoming mail protocol.
void	setInUsername(String username) Sets username for incoming mail authentication.
void	setLeaveMessagesOnServer(long leaveMsgsOnServer) Sets incoming messages life-time on mail server in milliseconds.
void	setListener(GridMessageListener listener) Set communication listener.
void	setOutConnectionType(GridMailCommunicationType type) Sets type of outgoing mail connection which should be one of the following: GridMailCommunicationType.NONE GridMailCommunicationType.SSL GridMailCommunicationType.STARTTLS If not provided, default value is GridMailCommunicationType.NONE.
void	setOutCustomProperties(Properties props) Sets any custom properties required for outgoing connection.
void	setOutHost(String host) Sets outgoing host name for sending emails (usually either SMTP or IMAP).
void	setOutPassword(String pswd) Sets password for outgoing mail authentication.
void	setOutPort(int port) Sets port number for outgoing mail.
void	setOutProtocol(GridMailCommunicationOutProtocol proto) Sets outgoing mail protocol.
void	setOutUsername(String username) Sets username for outgoing mail authentication.
void	setReadBatchSize(int size) Sets number of messages fetched from mail server at a time.
void	setReceiverDelay(long recvDelay) Sets interval in milliseconds between checking for new messages.
void	setStoreFileName(String fileName) Sets locally stored full file name for all read messages.
void	setSubject(String subj) Sets email message subject.
void	spiStart(String gridName) This method is called to start SPI.
void	spiStop() This method is called to stop SPI.
String	toString()

Methods inherited from class org.gridgain.grid.spi.GridSpiAdapter

assertParameter, configInfo, createSpiAttributeName, getAuthor, getGridGainHome, getLocalNodeId, getName, getSpiContext, getStartTimestamp, getStartTimestampFormatted, getUpTime, getUpTimeFormatted, getVendorEmail, getVendorUrl, getVersion, onContextDestroyed, onContextInitialized, registerMBean, setName, setSpiContext, startInfo, startStopwatch, stopInfo, unregisterMBean

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.gridgain.grid.spi.GridSpi

getName, onContextDestroyed, onContextInitialized

Methods inherited from interface org.gridgain.grid.spi.GridSpiManagementMBean

getAuthor, getGridGainHome, getLocalNodeId, getName, getStartTimestamp, getStartTimestampFormatted, getUpTime, getUpTimeFormatted, getVendorEmail, getVendorUrl, getVersion

Field Detail

DFLT_SUBJ

public static final String DFLT_SUBJ

Default subject of email (value is grid.email.comm.msg).

See Also:

Constant Field Values

DFLT_STORE_FILE_NAME

public static final String DFLT_STORE_FILE_NAME

Default local storage file name (value is grid-email-comm-msgs.dat).

See Also:

Constant Field Values

DFLT_RECEIVER_DELAY

public static final long DFLT_RECEIVER_DELAY

Delay in milliseconds between receiving email (value is 10000).

See Also:

Constant Field Values

DFLT_LEAVE_MSGS_ON_SERVER

public static final long DFLT_LEAVE_MSGS_ON_SERVER

Leave messages on server in milliseconds (value is 86400000).

See Also:

Constant Field Values

ATTR_EMAIL_ADDR

public static final String ATTR_EMAIL_ADDR

Node email address attribute name (value is comm.email.address).

See Also:

Constant Field Values

Constructor Detail

GridMailCommunicationSpi

public GridMailCommunicationSpi()

Set SPI default values for mailboxes configurations.

Method Detail

getNodeAttributes

public Map<String,Serializable> getNodeAttributes()
                                           throws GridSpiException

This method is called before SPI starts (before method GridSpi.spiStart(String) is called). It allows SPI implementation to add attributes to a local node. Kernel collects these attributes from all SPI implementations loaded up and then passes it to discovery SPI so that they can be exchanged with other nodes.

Specified by:

getNodeAttributes in interface GridSpi

Overrides:

getNodeAttributes in class GridSpiAdapter

Throws:

GridSpiException - Throws in case of any error.

Returns:

Map of local node attributes this SPI wants to add.

setOutHost

@GridSpiConfiguration(optional=false)
public void setOutHost(String host)

Sets outgoing host name for sending emails (usually either SMTP or IMAP).

There is no default value for the parameter.

Parameters:

host - Outgoing email host name.

setOutConnectionType

@GridSpiConfiguration(optional=true)
public void setOutConnectionType(GridMailCommunicationType type)

Sets type of outgoing mail connection which should be one of the following:

• GridMailCommunicationType.NONE
• GridMailCommunicationType.SSL
• GridMailCommunicationType.STARTTLS

If not provided, default value is GridMailCommunicationType.NONE.

Parameters:

type - Connection type.

setOutPort

@GridSpiConfiguration(optional=true)
public void setOutPort(int port)

Sets port number for outgoing mail.

If not provided, default value is 25.

Parameters:

port - Outgoing email port number.

setOutUsername

@GridSpiConfiguration(optional=true)
public void setOutUsername(String username)

Sets username for outgoing mail authentication. If provided, then password should also be provided. Username with null value means that no authentication will be used.

If not provided, default value is null.

Parameters:

username - Outbox username.

setOutPassword

@GridSpiConfiguration(optional=true)
public void setOutPassword(String pswd)

Sets password for outgoing mail authentication. If provided, then username should also be provided.

If not provided, default value is null.

Parameters:

pswd - Outbox password.

setInHost

@GridSpiConfiguration(optional=false)
public void setInHost(String host)

Sets incoming host name for receiving emails (usually either POP or IMAP).

There is no default value.

Parameters:

host - Incoming email host name.

setInConnectionType

@GridSpiConfiguration(optional=true)
public void setInConnectionType(GridMailCommunicationType type)

Sets type of incoming mail connection which should be one of the following:

• GridMailCommunicationType.NONE
• GridMailCommunicationType.SSL
• GridMailCommunicationType.STARTTLS

If not provided, default value is GridMailCommunicationType.NONE.

Parameters:

type - Connection type.

setInPort

@GridSpiConfiguration(optional=true)
public void setInPort(int port)

Sets port number for incoming mail.

If not provided, default value is 110.

Parameters:

port - Incoming email server port number.

setInUsername

@GridSpiConfiguration(optional=true)
public void setInUsername(String username)

Sets username for incoming mail authentication. If provided, then password should also be provided. Username with null value means that no authentication will be used.

If not provided, default value is null.

Parameters:

username - Incoming mailbox username.

setInPassword

@GridSpiConfiguration(optional=true)
public void setInPassword(String pswd)

Sets password for incoming mail authentication. If provided, then username should also be provided.

If not provided, default value is null.

Parameters:

pswd - Incoming mailbox password.

setSubject

@GridSpiConfiguration(optional=true)
public void setSubject(String subj)

Sets email message subject.

If not provided, default value is grid.email.comm.msg.

Parameters:

subj - Email message subject.

setFolderName

@GridSpiConfiguration(optional=true)
public void setFolderName(String folderName)

Sets name of email folder on mail server.

If not provided, default value is Inbox.

Parameters:

folderName - Mail server folder name.

setFromAddress

@GridSpiConfiguration(optional=false)
public void setFromAddress(String addr)

Sets 'From' address for all email messages. It is added as GridMailCommunicationSpi.ATTR_EMAIL_ADDR node attribute so it can be accessed on remote nodes. This address is used by other nodes to send email to this node.

There is no default value.

Parameters:

addr - Email address for data exchange.

setInCustomProperties

@GridSpiConfiguration(optional=true)
public void setInCustomProperties(Properties props)

Sets any custom properties required for receiving connection.

If not provided, default value is null.

Parameters:

props - Custom properties.

setOutCustomProperties

@GridSpiConfiguration(optional=true)
public void setOutCustomProperties(Properties props)

Sets any custom properties required for outgoing connection.

If not provided, default value is null.

Parameters:

props - Custom parameter.

setReadBatchSize

@GridSpiConfiguration(optional=true)
public void setReadBatchSize(int size)

Sets number of messages fetched from mail server at a time.

If not provided, default value is 100.

Parameters:

size - Number of fetched messages.

setReceiverDelay

@GridSpiConfiguration(optional=true)
public void setReceiverDelay(long recvDelay)

Sets interval in milliseconds between checking for new messages.

If not provided, default value is GridMailCommunicationSpi.DFLT_RECEIVER_DELAY.

Parameters:

recvDelay - Inverval between receiving messages.

setOutProtocol

@GridSpiConfiguration(optional=true)
public void setOutProtocol(GridMailCommunicationOutProtocol proto)

Sets outgoing mail protocol. Should be one of the following:

• GridMailCommunicationOutProtocol.SMTP
• GridMailCommunicationOutProtocol.SMTPS

If not provided, default value is GridMailCommunicationOutProtocol.SMTP.

Parameters:

proto - Outgoing mail protocol.

setInProtocol

@GridSpiConfiguration(optional=true)
public void setInProtocol(GridMailCommunicationInProtocol proto)

Sets incoming mail protocol. Should be one of the following:

• GridMailCommunicationInProtocol.POP3
• GridMailCommunicationInProtocol.POP3S
• GridMailCommunicationInProtocol.IMAP
• GridMailCommunicationInProtocol.IMAPS

If not provided, default value is GridMailCommunicationInProtocol.POP3.

Parameters:

proto - Incoming protocol.

setStoreFileName

@GridSpiConfiguration(optional=true)
public void setStoreFileName(String fileName)

Sets locally stored full file name for all read messages. Can be either full path or a path relative to GridGain installation home folder.

If not provided, default value is GridMailCommunicationSpi.DFLT_STORE_FILE_NAME.

Parameters:

fileName - Local storage file name.

setLeaveMessagesOnServer

@GridSpiConfiguration(optional=true)
public void setLeaveMessagesOnServer(long leaveMsgsOnServer)

Sets incoming messages life-time on mail server in milliseconds.

If not provided, default value is GridMailCommunicationSpi.DFLT_LEAVE_MSGS_ON_SERVER.

Parameters:

leaveMsgsOnServer - Time to live for incoming messages.

getReceiverDelay

public long getReceiverDelay()

Gets interval in milliseconds between checking for new messages.

Specified by:

getReceiverDelay in interface GridMailCommunicationSpiMBean

Returns:

Interval between receiving messages.

getLeaveMessagesOnServer

public long getLeaveMessagesOnServer()

Gets incoming messages life-time on mail server in milliseconds.

Specified by:

getLeaveMessagesOnServer in interface GridMailCommunicationSpiMBean

Returns:

Time to live for incoming messages.

getOutConnectionTypeFormatted

public String getOutConnectionTypeFormatted()

Gets type of outgoing mail connection. Should be one of the following:

• NONE
• SSL
• STARTTLS
• null

Specified by:

getOutConnectionTypeFormatted in interface GridMailCommunicationSpiMBean

Returns:

Connection type.

getOutProtocolFormatted

public String getOutProtocolFormatted()

Gets outgoing mail protocol. Could be one of the following:

• SMTP
• SMTPS
• null

Specified by:

getOutProtocolFormatted in interface GridMailCommunicationSpiMBean

Returns:

Outgoing mail protocol.

getOutHost

public String getOutHost()

Gets outgoing host name for sending email (usually either SMTP or IMAP).

Specified by:

getOutHost in interface GridMailCommunicationSpiMBean

Returns:

Outgoing email host name.

getOutPort

public int getOutPort()

Gets port number for outgoing mail.

Specified by:

getOutPort in interface GridMailCommunicationSpiMBean

Returns:

Outgoing email port number.

getOutUsername

public String getOutUsername()

Gets username for outgoing mail authentication.

Specified by:

getOutUsername in interface GridMailCommunicationSpiMBean

Returns:

Outbox username.

getInConnectionTypeFormatted

public String getInConnectionTypeFormatted()

Gets type of incoming mail connection. Should be one of the following:

• NONE
• SSL
• STARTTLS
• null

Specified by:

getInConnectionTypeFormatted in interface GridMailCommunicationSpiMBean

Returns:

Connection type.

getReadBatchSize

public int getReadBatchSize()

Gets number of messages fetched from mail server at a time.

Specified by:

getReadBatchSize in interface GridMailCommunicationSpiMBean

Returns:

Number of fetched messages.

getInProtocolFormatted

public String getInProtocolFormatted()

Sets incoming mail protocol. Could be one of the following:

• POP3
• POP3S
• IMAP
• IMAPS
• null

Specified by:

getInProtocolFormatted in interface GridMailCommunicationSpiMBean

Returns:

Incoming protocol.

getInHost

public String getInHost()

Gets incoming host name for receiving email (usually either POP or IMAP).

Specified by:

getInHost in interface GridMailCommunicationSpiMBean

Returns:

Incoming email host name.

getInPort

public int getInPort()

Gets incoming host port number for receiving email.

Specified by:

getInPort in interface GridMailCommunicationSpiMBean

Returns:

Incoming email host name.

getInUsername

public String getInUsername()

Gets incoming host username for receiving email.

Specified by:

getInUsername in interface GridMailCommunicationSpiMBean

Returns:

Incoming email host name.

getFolderName

public String getFolderName()

Gets folder name of email folder on mail server.

Specified by:

getFolderName in interface GridMailCommunicationSpiMBean

Returns:

Email folder name.

getSubject

public String getSubject()

Gets email message subject.

Specified by:

getSubject in interface GridMailCommunicationSpiMBean

Returns:

Email message subject.

getOutCustomProperties

public Properties getOutCustomProperties()

Gets custom properties required for outgoing connection.

Specified by:

getOutCustomProperties in interface GridMailCommunicationSpiMBean

Returns:

Outgoing connection properties.

getInCustomProperties

public Properties getInCustomProperties()

Gets custom properties required for receiving connection.

Specified by:

getInCustomProperties in interface GridMailCommunicationSpiMBean

Returns:

Properties.

getFromAddress

public String getFromAddress()

Gets message field 'From' all email messages.

Specified by:

getFromAddress in interface GridMailCommunicationSpiMBean

Returns:

Message field 'From'.

getStoreFileName

public String getStoreFileName()

Gets locally stored full file name for all read messages. Can be either full path or a path relative to GridGain installation home folder.

Specified by:

getStoreFileName in interface GridMailCommunicationSpiMBean

Returns:

Store file path.

sendMessage

public void sendMessage(GridNode destNode,
                        Serializable msg)
                 throws GridSpiException

Sends given message to destination node. Note that characteristics of the exchange such as durability, guaranteed delivery or error notification is dependant on SPI implementation.

Specified by:

sendMessage in interface GridCommunicationSpi

Throws:

GridSpiException - Thrown in case of any error during sending the message. Note that this is not guaranteed that failed communication will result in thrown exception as this is dependant on SPI implementation.

Parameters:

destNode - Destination node.

msg - Message to send.

sendMessage

public void sendMessage(Collection<GridNode> destNodes,
                        Serializable msg)
                 throws GridSpiException

Sends given message to destination nodes. Note that characteristics of the exchange such as durability, guaranteed delivery or error notification is dependant on SPI implementation.

Specified by:

sendMessage in interface GridCommunicationSpi

Throws:

GridSpiException - Thrown in case of any error during sending the message. Note that this is not guaranteed that failed communication will result in thrown exception as this is dependant on SPI implementation.

Parameters:

destNodes - Destination nodes.

msg - Message to send.

setListener

public void setListener(GridMessageListener listener)

Set communication listener.

Specified by:

setListener in interface GridCommunicationSpi

Parameters:

listener - Listener to set or null to unset the listener.

spiStart

public void spiStart(String gridName)
              throws GridSpiException

This method is called to start SPI. After this method returns successfully kernel assumes that SPI is fully operational.

Specified by:

spiStart in interface GridSpi

Throws:

GridSpiException - Throws in case of any error during SPI start.

Parameters:

gridName - Name of grid instance this SPI is being started for (null for default grid).

spiStop

public void spiStop()
             throws GridSpiException

This method is called to stop SPI. After this method returns kernel assumes that this SPI is finished and all resources acquired by it are released. Note that this method can be called at any point including during recovery of failed start. It should make no assumptions on what state SPI will be in when this method is called.

Specified by:

spiStop in interface GridSpi

Throws:

GridSpiException - Thrown in case of any error during SPI stop.

getConsistentAttributeNames

protected List<String> getConsistentAttributeNames()

Returns back list of attributes that should be consistent for this SPI. Consistency means that remote node has to have the same attribute with the same value.

Overrides:

getConsistentAttributeNames in class GridSpiAdapter

Returns:

List or attribute names.

toString

public String toString()

Overrides:

toString in class Object