com.unboundid.ldap.sdk

Class LDAPConnectionPoolHealthCheck

java.lang.Object

com.unboundid.ldap.sdk.LDAPConnectionPoolHealthCheck

Direct Known Subclasses:

ActiveAlertsLDAPConnectionPoolHealthCheck, AggregateLDAPConnectionPoolHealthCheck, GetEntryLDAPConnectionPoolHealthCheck, LockdownModeLDAPConnectionPoolHealthCheck, MaximumIdleDurationLDAPConnectionPoolHealthCheck, PasswordExpirationLDAPConnectionPoolHealthCheck, PruneUnneededConnectionsLDAPConnectionPoolHealthCheck, ReplicationBacklogLDAPConnectionPoolHealthCheck, ReportBindResultLDAPConnectionPoolHealthCheck

@Extensible
 @ThreadSafety(level=INTERFACE_THREADSAFE)
public class LDAPConnectionPoolHealthCheck
extends java.lang.Object

This class provides an API that may be used to determine whether connections associated with a connection pool are valid and suitable for use. It provides the ability to check the validity of a connection at the following times:

• Whenever a new connection is created for use in the pool, the ensureNewConnectionValid(LDAPConnection) method will be called before making that connection available. The default implementation provided in this class does not perform any kind of processing, but subclasses may override this behavior if desired.
• Whenever a connection is checked out from the pool (including connections checked out internally for operations performed in the pool), the ensureConnectionValidForCheckout(LDAPConnection) method will be called. The default implementation provided in this class does not perform any kind of processing, but subclasses may override this behavior if desired.
• Whenever a connection is released back to the pool (including connections checked out internally for operations performed in the pool), the ensureConnectionValidForRelease(LDAPConnection) method will be called. The default implementation provided in this class does not perform any kind of processing, but subclasses may override this behavior if desired.
• The ensureConnectionValidForContinuedUse(LDAPConnection) method will be invoked periodically by a background thread created by the connection pool to determine whether available connections within the pool are still valid. The default implementation provided in this class does not perform any kind of processing, but subclasses may override this behavior if desired.
• The ensureConnectionValidAfterException(com.unboundid.ldap.sdk.LDAPConnection, com.unboundid.ldap.sdk.LDAPException) method may be invoked if an exception is caught while processing an operation with a connection that is part of a connection pool. The default implementation provided in this class only examines the result code of the provided exception and uses the ResultCode.isConnectionUsable(ResultCode) method to make the determination, but subclasses may override this behavior if desired.

Note that health check implementations should be designed so that they are suitable for use with connections having any authentication state. The ensureNewConnectionValid(LDAPConnection) method will be invoked on unauthenticated connections, and the remaining health check methods will be invoked using whatever credentials are assigned to connections in the associated connection pool.

Constructor Summary

Constructors

Constructor and Description
LDAPConnectionPoolHealthCheck() Creates a new instance of this LDAP connection pool health check.

Method Summary

Modifier and Type	Method and Description
void	ensureConnectionValidAfterAuthentication(LDAPConnection connection, BindResult bindResult) Performs any desired processing to determine whether the provided connection is valid after processing a bind operation with the provided result.
void	ensureConnectionValidAfterException(LDAPConnection connection, LDAPException exception) Indicates whether the provided connection may still be considered valid after an attempt to process an operation yielded the given exception.
void	ensureConnectionValidForCheckout(LDAPConnection connection) Performs any desired processing to determine whether the provided connection is available to be checked out and used for processing operations.
void	ensureConnectionValidForContinuedUse(LDAPConnection connection) Performs any desired processing to determine whether the provided connection is valid and should continue to be made available for processing operations.
void	ensureConnectionValidForRelease(LDAPConnection connection) Performs any desired processing to determine whether the provided connection is valid and should be released back to the pool to be used for processing other operations.
void	ensureNewConnectionValid(LDAPConnection connection) Performs any desired processing to determine whether the provided new connection is available to be checked out and used for processing operations.
void	performPoolMaintenance(AbstractConnectionPool pool) Performs any processing that may be appropriate on an ongoing basis for the connection pool that is related to the pool itself rather than any individual connection.
java.lang.String	toString() Retrieves a string representation of this LDAP connection pool health check.
void	toString(java.lang.StringBuilder buffer) Appends a string representation of this LDAP connection pool health check to the provided buffer.

Methods inherited from class java.lang.Object

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

Constructor Detail

LDAPConnectionPoolHealthCheck

public LDAPConnectionPoolHealthCheck()

Creates a new instance of this LDAP connection pool health check.

Method Detail

ensureNewConnectionValid

public void ensureNewConnectionValid(@NotNull
                                     LDAPConnection connection)
                              throws LDAPException

Performs any desired processing to determine whether the provided new connection is available to be checked out and used for processing operations. This method will be invoked by either ServerSet used by the connection pool (if it supports enhanced health checking) or by the connection pool itself at the time that a new connection is created. No authentication will have been performed on this connection at the time the health check is invoked.

Parameters:

connection - The connection to be examined.

Throws:

LDAPException - If a problem is detected that suggests that the provided connection is not suitable for use.

ensureConnectionValidAfterAuthentication

public void ensureConnectionValidAfterAuthentication(@NotNull
                                                     LDAPConnection connection,
                                                     @NotNull
                                                     BindResult bindResult)
                                              throws LDAPException

Performs any desired processing to determine whether the provided connection is valid after processing a bind operation with the provided result.

This method will be invoked under the following circumstances:

• If you create a connection pool with a ServerSet and a non-null BindRequest, then this health check method will be invoked for every new connection created by the pool after processing that BindRequest on the connection. If you create a connection pool with a ServerSet but a null BindRequest, then no authentication will be attempted (and therefore this health check method will not be invoked for) newly-created connections.
• If you create a connection pool with an LDAPConnection after having performed a bind operation on that connection, then every new connection created by the pool will attempt to perform the same type of bind operation and this health check method will be invoked after that bind attempt has completed. If you create a connection pool with an LDAPConnection that has not been authenticated, then no authentication will be attempted (and therefore this health check method will not be invoked for) newly-created connections.
• If you call a connection pool's bindAndRevertAuthentication method, then this health check method will be called after the second bind operation (the one used to revert authentication) has completed. In this case, this health check method will be called even if the connection pool was created with a null BindRequest or with an unauthenticated LDAPConnection. In that case, the bind operation used to revert authentication will be a SimpleBindRequest with an empty DN and password.
• If you call a connection pool's releaseAndReAuthenticateConnection method, then this health check method will be called after the bind operation has completed. As with bindAndRevertAuthentication, this health check method will be called even if the connection pool was created with a null BindRequest or with an unauthenticated LDAPConnection.

Note that this health check method may be invoked even if the bind attempt was not successful. This is useful because it allows the health check to intercept a failed authentication attempt and differentiate it from other types of failures in the course of trying to create or check out a connection. In the event that it is invoked with a BindResult that has a result code other than ResultCode.SUCCESS, if this method throws an exception then that exception will be propagated to the caller. If this method does not throw an exception when provided with a non-SUCCESS result, then the connection pool itself will throw an exception using the information in the bind result.

Parameters:

connection - The connection to be examined.

bindResult - The bind result obtained from the authentication process.

Throws:

LDAPException - If a problem is detected that suggests that the provided connection is not suitable for use.

ensureConnectionValidForCheckout

public void ensureConnectionValidForCheckout(@NotNull
                                             LDAPConnection connection)
                                      throws LDAPException

Performs any desired processing to determine whether the provided connection is available to be checked out and used for processing operations. This method will be invoked by the LDAPConnectionPool.getConnection() method before handing out a connection. This method should return normally if the connection is believed to be valid, or should throw an LDAPException if a problem is detected.

Parameters:

connection - The connection to be examined.

Throws:

LDAPException - If a problem is detected that suggests that the provided connection is not suitable for use.

ensureConnectionValidForRelease

public void ensureConnectionValidForRelease(@NotNull
                                            LDAPConnection connection)
                                     throws LDAPException

Performs any desired processing to determine whether the provided connection is valid and should be released back to the pool to be used for processing other operations. This method will be invoked by the LDAPConnectionPool.releaseConnection(LDAPConnection) method before making the connection available for use in processing other operations. This method should return normally if the connection is believed to be valid, or should throw an LDAPException if a problem is detected.

Parameters:

connection - The connection to be examined.

Throws:

LDAPException - If a problem is detected that suggests that the provided connection is not suitable for use.

ensureConnectionValidForContinuedUse

public void ensureConnectionValidForContinuedUse(@NotNull
                                                 LDAPConnection connection)
                                          throws LDAPException

Performs any desired processing to determine whether the provided connection is valid and should continue to be made available for processing operations. This method will be periodically invoked by a background thread used to test availability of connections within the pool. This method should return normally if the connection is believed to be valid, or should throw an LDAPException if a problem is detected.

Parameters:

connection - The connection to be examined.

Throws:

LDAPException - If a problem is detected that suggests that the provided connection is not suitable for use.

performPoolMaintenance

public void performPoolMaintenance(@NotNull
                                   AbstractConnectionPool pool)

Performs any processing that may be appropriate on an ongoing basis for the connection pool that is related to the pool itself rather than any individual connection. This method will be invoked by the pool's LDAPConnectionPoolHealthCheckThread at an interval specified by the pool's AbstractConnectionPool.getHealthCheckIntervalMillis() method. This method will be invoked after all other periodic processing (for example, after calling ensureConnectionValidForContinuedUse(com.unboundid.ldap.sdk.LDAPConnection) on each available connection, if appropriate for the pool implementation) has been performed during the interval.

Parameters:

pool - The connection pool on which to perform maintenance.

ensureConnectionValidAfterException

public void ensureConnectionValidAfterException(@NotNull
                                                LDAPConnection connection,
                                                @NotNull
                                                LDAPException exception)
                                         throws LDAPException

Indicates whether the provided connection may still be considered valid after an attempt to process an operation yielded the given exception. This method will be invoked by the AbstractConnectionPool.releaseConnectionAfterException(com.unboundid.ldap.sdk.LDAPConnection, com.unboundid.ldap.sdk.LDAPException) method, and it may also be manually invoked by external callers if an exception is encountered while processing an operation on a connection checked out from the pool. It may make a determination based solely on the provided exception, or it may also attempt to use the provided connection to further test its validity. This method should return normally if the connection is believed to be valid, or should throw an LDAPException if a problem is detected.

Parameters:

connection - The connection to be examined.

exception - The exception that was caught while processing an operation on the connection.

Throws:

LDAPException - If a problem is detected that suggests that the provided connection is not suitable for use.

toString

@NotNull
public final java.lang.String toString()

Retrieves a string representation of this LDAP connection pool health check.

Overrides:

toString in class java.lang.Object

Returns:

A string representation of this LDAP connection pool health check.

toString

public void toString(@NotNull
                     java.lang.StringBuilder buffer)

Appends a string representation of this LDAP connection pool health check to the provided buffer.

Parameters:

buffer - The buffer to which the information should be appended.