com.tangosol.net

Class ConfigurableQuorumPolicy.PartitionedCacheQuorumPolicy

java.lang.Object

com.tangosol.util.Base

com.tangosol.net.ConfigurableQuorumPolicy

com.tangosol.net.ConfigurableQuorumPolicy.MembershipQuorumPolicy

com.tangosol.net.ConfigurableQuorumPolicy.PartitionedCacheQuorumPolicy

All Implemented Interfaces:

ActionPolicy

Enclosing class:

ConfigurableQuorumPolicy

public static class ConfigurableQuorumPolicy.PartitionedCacheQuorumPolicy
extends ConfigurableQuorumPolicy.MembershipQuorumPolicy

PartitionedCacheQuorumPolicy defines a configurable quorum policy that is applicable to a DistributedCacheService.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ConfigurableQuorumPolicy.PartitionedCacheQuorumPolicy.ActionRule Action Rules for ConfigurableQuorumPolicy.PartitionedCacheQuorumPolicy
static class	ConfigurableQuorumPolicy.PartitionedCacheQuorumPolicy.Notification Notification is a simple struct carrying the notification info.

Nested classes/interfaces inherited from class com.tangosol.net.ConfigurableQuorumPolicy.MembershipQuorumPolicy

ConfigurableQuorumPolicy.MembershipQuorumPolicy.QuorumListener, ConfigurableQuorumPolicy.MembershipQuorumPolicy.QuorumRule

Nested classes/interfaces inherited from class com.tangosol.net.ConfigurableQuorumPolicy

ConfigurableQuorumPolicy.ClusterQuorumPolicy, ConfigurableQuorumPolicy.MembershipQuorumPolicy, ConfigurableQuorumPolicy.PartitionedCacheQuorumPolicy, ConfigurableQuorumPolicy.ProxyQuorumPolicy

Nested classes/interfaces inherited from class com.tangosol.util.Base

Base.LoggingWriter, Base.StackFrame

Field Summary

Fields

Modifier and Type	Field and Description
protected AddressProvider	m_apRecovery The recovery address-provider.
protected boolean	m_fDynamic If set to true, indicates a dynamic active recovery strategy.
protected long	m_ldtLastReport The last time disallowed actions were reported.
static int	MASK_DISTRIBUTION Bitmask used to encode a distribution action.
protected static int	MASK_LAST The highest used bitmask value.
static int	MASK_READ Bitmask used to encode a read action.
static int	MASK_RECOVER Bitmask used to encode a recover action.
static int	MASK_RESTORE Bitmask used to encode a partition restore action.
static int	MASK_WRITE Bitmask used to encode a write action.

Fields inherited from class com.tangosol.net.ConfigurableQuorumPolicy.MembershipQuorumPolicy

m_aRules, m_ruleCurrent, m_service, m_setLeaving

Fields inherited from class com.tangosol.util.Base

LOG_ALWAYS, LOG_DEBUG, LOG_ERR, LOG_INFO, LOG_MAX, LOG_MIN, LOG_QUIET, LOG_WARN, POWER_0, POWER_G, POWER_K, POWER_M, POWER_T, UNIT_D, UNIT_H, UNIT_M, UNIT_MS, UNIT_NS, UNIT_S, UNIT_US

Constructor Summary

Constructors

Constructor and Description
PartitionedCacheQuorumPolicy(ConfigurableQuorumPolicy.MembershipQuorumPolicy.QuorumRule[] aRule, AddressProvider provider) Construct a PartitionedCacheQuorumPolicy with the specified rule.

Method Summary

Modifier and Type	Method and Description
protected static int	calculateMinimumNodeCount(Set<Member> setMembers) Given a set of Member objects, calculate the minimum number of nodes on a single machine.
protected int	calculateMinThreshold(int cLast) Calculate the minimum number of storage enabled nodes necessary to proceed with the service recovery.
protected List<ConfigurableQuorumPolicy.PartitionedCacheQuorumPolicy.Notification>	checkRecoveryMembership(PartitionedService.PartitionRecoveryAction action) Check if the recovery is allowed for the current membership.
protected String	getActionName(int nMask) Return the string description of the given rule mask.
protected Set	getOwnershipMemberSet() Return the set of ownership-enabled members in the associated PartitionedService.
int	getPolicyPopulation() Calculate and return the current size of the member set that contributes to the quorum for this policy domain.
PartitionedService	getService() Return the associated PartitionedService.
String	getStatusDescription() Return a String that describes the current Quorum state.
boolean	isAllowed(Service service, Action action) Evaluate if the specified action is currently allowed by this policy.
protected void	reportDisallowedAction(int nMaskDisallowed, List<ConfigurableQuorumPolicy.PartitionedCacheQuorumPolicy.Notification> listReasons) Report all disallowed actions if the quorum rule has changed.
protected static String	reportLastOwnership(PartitionSet parts, com.tangosol.net.internal.QuorumInfo info) Report the machine names in the "last good" membership that owned the specified partitions.
protected void	updateCurrentRule() Update the currently applicable quorum rule, possibly changing it to reflect growth or shrinkage of the membership size.

Methods inherited from class com.tangosol.net.ConfigurableQuorumPolicy.MembershipQuorumPolicy

configure, getCurrentRule, getLeavingMembers, getQuorumRules, init, instantiateMemberListener, setCurrentRule, setQuorumRules, setService, toString

Methods inherited from class com.tangosol.net.ConfigurableQuorumPolicy

instantiateClusterPolicy, instantiatePartitionedCachePolicy, instantiateProxyPolicy

Methods inherited from class com.tangosol.util.Base

azzert, azzert, azzert, azzertFailed, breakLines, breakLines, capitalize, checkNotEmpty, checkNotNull, checkRange, computeSafeWaitTime, decimalValue, dup, dup, ensureBigDecimal, ensureClassLoader, ensureRuntimeException, ensureRuntimeException, equals, equalsDeep, err, err, err, err, err, escape, formatDateTime, getCallerStackFrame, getCommonMonitor, getCommonMonitor, getCommonMonitor, getContextClassLoader, getContextClassLoader, getDeepMessage, getErr, getLastSafeTimeMillis, getLog, getMaxDecDigits, getMaxHexDigits, getOriginalException, getOut, getRandom, getRandomBinary, getRandomBinary, getRandomString, getSafeTimeMillis, getStackFrame, getStackFrames, getStackTrace, getStackTrace, getThreadFactory, getTimeZone, getUpTimeMillis, hashCode, hexValue, indentString, indentString, isDecimal, isHex, isLogEcho, isOctal, log, log, log, log, log, makeInteger, makeLong, makeThread, mod, mod, octalValue, out, out, out, out, out, pad, parseBandwidth, parseBandwidth, parseDelimitedString, parseHex, parseHex, parseMemorySize, parseMemorySize, parsePercentage, parseTime, parseTime, parseTimeNanos, parseTimeNanos, printStackTrace, randomize, randomize, randomize, read, read, read, read, read, read, read, replace, setErr, setLog, setLogEcho, setOut, sleep, toBandwidthString, toBandwidthString, toCharEscape, toCrc, toCrc, toCrc, toCrc, toCrc, toDecString, toDelimitedString, toDelimitedString, toDelimitedString, toDelimitedString, toHex, toHex, toHexDump, toHexEscape, toHexEscape, toHexEscape, toHexEscape, toHexString, toMemorySizeString, toMemorySizeString, toQuotedCharEscape, toQuotedStringEscape, toSqlString, toString, toString, toStringEscape, toUnicodeEscape, trace, trace, trace, trace, trace, trace, trace, trace, trace, truncateString, truncateString, wait

Methods inherited from class java.lang.Object

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

Field Detail

MASK_DISTRIBUTION

public static final int MASK_DISTRIBUTION

Bitmask used to encode a distribution action.

See Also:

Constant Field Values

MASK_RESTORE

public static final int MASK_RESTORE

Bitmask used to encode a partition restore action.

See Also:

Constant Field Values

MASK_READ

public static final int MASK_READ

Bitmask used to encode a read action.

See Also:

Constant Field Values

MASK_WRITE

public static final int MASK_WRITE

Bitmask used to encode a write action.

See Also:

Constant Field Values

MASK_RECOVER

public static final int MASK_RECOVER

Bitmask used to encode a recover action.

See Also:

Constant Field Values

MASK_LAST

protected static final int MASK_LAST

The highest used bitmask value.

See Also:

Constant Field Values

m_apRecovery

protected AddressProvider m_apRecovery

The recovery address-provider.

m_ldtLastReport

protected long m_ldtLastReport

The last time disallowed actions were reported.

m_fDynamic

protected boolean m_fDynamic

If set to true, indicates a dynamic active recovery strategy.

Constructor Detail

PartitionedCacheQuorumPolicy

public PartitionedCacheQuorumPolicy(ConfigurableQuorumPolicy.MembershipQuorumPolicy.QuorumRule[] aRule,
                                    AddressProvider provider)

Construct a PartitionedCacheQuorumPolicy with the specified rule.

Parameters:

aRule - the quorum rule

provider - the recovery address-provider

Method Detail

getOwnershipMemberSet

protected Set getOwnershipMemberSet()

Return the set of ownership-enabled members in the associated PartitionedService.

Returns:

the set of ownership-enabled members

getService

public PartitionedService getService()

Return the associated PartitionedService.

Overrides:

getService in class ConfigurableQuorumPolicy.MembershipQuorumPolicy

Returns:

the associated PartitionedService

checkRecoveryMembership

protected List<ConfigurableQuorumPolicy.PartitionedCacheQuorumPolicy.Notification> checkRecoveryMembership(PartitionedService.PartitionRecoveryAction action)

Check if the recovery is allowed for the current membership.
If the address provider is specified, it means that all the recovery addresses are represented by the ownership-enabled members.
For dynamic active persistence strategy it means that:

• Global partition (partition 0) is recoverable.
• All machines, derived from the global partition, are present.
• All other partitions are accessible / recoverable across the service members.
• The number of members is larger than the threshold, which is calculated as a factor of the "last well-formed" member set size

Note: the implementation *MUST NOT* mutate the action's state (including the resolver's)<b/>

Returns:

null if the recovery is allowed; otherwise a list of rejection reasons

calculateMinThreshold

protected int calculateMinThreshold(int cLast)

Calculate the minimum number of storage enabled nodes necessary to proceed with the service recovery.

Parameters:

cLast - the "last well-formed" member set size

Returns:

the number of nodes necessary for the recovery to commence; the default implementation calculates it as "2/3" of the last "well-formed" member set size.

reportLastOwnership

protected static String reportLastOwnership(PartitionSet parts,
                                            com.tangosol.net.internal.QuorumInfo info)

Report the machine names in the "last good" membership that owned the specified partitions.

Parameters:

parts - the partitions to report

info - the QuorumInfo containing the "last good" membership data

Returns:

the human readable string with the machine names

calculateMinimumNodeCount

protected static int calculateMinimumNodeCount(Set<Member> setMembers)

Given a set of Member objects, calculate the minimum number of nodes on a single machine.

Parameters:

setMembers - the member set

Returns:

the minimum number of nodes for a machine

getStatusDescription

public String getStatusDescription()

Return a String that describes the current Quorum state.

Specified by:

getStatusDescription in class ConfigurableQuorumPolicy

Returns:

a String describing the allowed actions in the current state

getPolicyPopulation

public int getPolicyPopulation()

Calculate and return the current size of the member set that contributes to the quorum for this policy domain.

Note: The quorum for PartitionedService is determined by the ownership-enabled members only.

Overrides:

getPolicyPopulation in class ConfigurableQuorumPolicy.MembershipQuorumPolicy

Returns:

the current size

isAllowed

public boolean isAllowed(Service service,
                         Action action)

Evaluate if the specified action is currently allowed by this policy.

Note: for forward compatibility, implementations should generally return true for actions that are not recognized.

Parameters:

service - the service that is performing the action

action - the action that is being performed

Returns:

true iff the specified action is currently allowed by this policy

updateCurrentRule

protected void updateCurrentRule()

Description copied from class: ConfigurableQuorumPolicy.MembershipQuorumPolicy

Update the currently applicable quorum rule, possibly changing it to reflect growth or shrinkage of the membership size.

Overrides:

updateCurrentRule in class ConfigurableQuorumPolicy.MembershipQuorumPolicy

reportDisallowedAction

protected void reportDisallowedAction(int nMaskDisallowed,
                                      List<ConfigurableQuorumPolicy.PartitionedCacheQuorumPolicy.Notification> listReasons)

Report all disallowed actions if the quorum rule has changed.

Parameters:

nMaskDisallowed - a mask of the disallowed action

listReasons - (optional) a list of rejection reasons

getActionName

protected String getActionName(int nMask)

Return the string description of the given rule mask.

Parameters:

nMask - the bitmask

Returns:

the string description of the given rule mask