A View into Options 491 in Java

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A View into Options 491
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TABLE 14-1
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PROPERTY
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OPTIONS IN LDAPCONSTRAINTS
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DATA TYPE DEFAULT VALUE
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LDAPCONNECTION OPTION TIMELIMIT REFERRALS REFERRALS_BIND_PROC REFERRALS_REBIND_PROC REFERRALS_HOP_LIMIT
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TimeLimit Referrals BindProc RebindProc HopLimit
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int boolean LDAPBind LDAPRebind Int
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0 (no limit) false null null 10
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After the object is created, the settings may be applied to a connection as follows:
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ldcsetConstraints( cons );
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The parameters used with LDAPConstraints will be explained shortly An individual option for an LDAPConnection may be altered or retrieved by using the setOption and getOption methods for that option, as summarized in Table 14-1 The corresponding property in LDAPConstraints is accessed with the get and set methods for the property for example, getTimeLimit to get the TimeLimit property To have the client wait only 10 milliseconds for results back from the directory server for all operations on this connection, use the following:
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ldcsetOption( ldcTIMELIMIT, new Integer( 10 ) );
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To prepare a constraints object for use with one or more operations, use the
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setTimeLimit method:
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conssetTimeLimit( 10 );
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Let s examine what each of these options does for a connection
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TimeLimit
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The TimeLimit value speci es the maximum time in milliseconds to wait for results from the server If an operation does not complete within the designated time interval, an LDAPException with a result code of TIME_LIMIT_EXCEEDED will be thrown If a value of 0 is speci ed, then no limit will be set on the time to wait This limit is enforced by the SDK, not by the server The default value for this setting within the SDK is 0 (no limit)
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492 Options and Constraints
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Referrals
A server that does not hold requested information may return a referral on an LDAP operation The client must then connect to the referred-to server to obtain the real information The options that control the processing of referrals are discussed in detail in 16 The default value for this setting is false (not to follow referrals)
BindProc
This property allows you to specify an object that will manage authentication during the processing of a referral The object must implement the bind method:
public void bind ( LDAPConnection ldc ) throws LDAPException
LDAPConnection will call this method when authenticating while following a
referral The application is responsible for reconnecting the connection object if necessary and for authenticating, using whatever credentials are required See 16 for details on using LDAPBind The default value for this setting is null (which indicates that a RebindProc should be used for reauthentication, if speci ed, or that referrals should be followed using anonymous authentication)
ReBindProc
This property speci es an object that implements the LDAPRebind interface It is used when the following of a referral requires more than an anonymous bind to authenticate, but it will use a DN and password (not a SASL mechanism) If you set referral handling to true and use null for both the BindProc and the RebindProc properties, the SDK will use anonymous authentication The default value for this setting is null
HopLimit
If a referral is encountered during the execution of an operation, and referral handling is true, the SDK will make a new temporary connection to the referred-to server if necessary and continue the operation there Every reference to a different server is considered an additional hop The HopLimit option tells the SDK how many different connections it should follow before throwing an LDAPException with a result code of REFERRAL_LIMIT_EXCEEDED The following instruction will set the hop limit for a particular constraints object to three:
Constraints for Searching 493
conssetHopLimit( 3 );
The main purposes of the limit are to prevent endless loops (if a server is miscon gured so that a referral points back to itself, for example) and to allow a client to limit the network activity of an application within a complicated referral environment The default value for this setting is 10
Constraints for Searching
The LDAPSearchConstraints object extends LDAPConstraints by adding options that apply only to search operations You can use an LDAPSearchConstraints object anywhere you can use an LDAPConstraints object, but the options that are speci c to searching will be ignored for all operations other than search Construct an LDAPSearchConstraints object with one of the following:
public LDAPSearchConstraints (); public LDAPSearchConstraints ( int msLimit, int serverTimeLimit, int dereference, int maxResults, boolean doReferrals, int batchSize, LDAPRebind reauth, int hop_limit ); public LDAPSearchConstraints ( int msLimit, int serverTimeLimit, int dereference, int maxResults, boolean doReferrals, int batchSize, LDAPBind bind, int hop_limit ); LDAPSearchConstraints cons = ldcgetSearchConstraints();
Search constraints can be applied to a connection or supplied as a parameter to a search operation The properties in boldface in Table 14-2 are identical to the properties in the superclass LDAPConstraints For example, the TimeLimit property has the same functionality whether applied to an individual search or to the connection