com.ibm.as400.access
Class UserSpace

java.lang.Object
  com.ibm.as400.access.UserSpace

All Implemented Interfaces:

Serializable

public class UserSpace
extends Object
implements Serializable

Represents a user space object in the IBM i operating system.

Usage note: By default, the UserSpace class will make use of two different host servers. For performance reasons, the File Server will be used for read() and write() requests, and the Remote Command Host Server will be used for create() and other requests. This behavior can be changed with the setMustUseProgramCall() method.

Similarly, when running directly on IBM i, by default the UserSpace class will call internal API's and commands on-thread when possible, bypassing the Remote Command Host Server. This behavior can be changed with the setMustUseSockets() method.

For applications that access user spaces located in QTEMP, users are strongly advised to keep everything in the same job, by calling setMustUseProgramCall(true) and setMustUseSockets(true), since different jobs have different QTEMP libraries.

See Also:

Serialized Form

Field Summary

Modifier and Type	Field and Description
static String	DOMAIN_DEFAULT Constant representing the default domain for the user space.
static String	DOMAIN_SYSTEM Constant indicating the domain for the user space is *SYSTEM.
static String	DOMAIN_USER Constant indicating the domain for the user space is *USER.
static int	FORCE_ASYNCHRONOUS Force to auxiliary storage option that allows changes to be forced asynchronously.
static int	FORCE_NONE Force to auxiliary storage option that does not allow changes to be forced.
static int	FORCE_SYNCHRONOUS Force to auxiliary storage option that allows changes to be forced synchronously.

Constructor and Description

UserSpace()
Constructs a UserSpace object.

UserSpace(AS400 system, String path)
Constructs a UserSpace object.

Method Summary

Modifier and Type	Method and Description
void	addPropertyChangeListener(PropertyChangeListener listener) Adds a listener to be notified when the value of any bound property is changed.
void	addUserSpaceListener(UserSpaceListener listener) Adds a listener to be notified when a UserSpaceEvent is fired.
void	addVetoableChangeListener(VetoableChangeListener listener) Adds a listener to be notified when the value of any constrained property is changed.
void	close() Closes the user space and releases any system resources associated with the stream.
void	create(int length, boolean replace, String extendedAttribute, byte initialValue, String textDescription, String authority) Creates the user space.
void	create(String domain, int length, boolean replace, String extendedAttribute, byte initialValue, String textDescription, String authority) Creates the user space.
void	delete() Deletes the user space.
boolean	exists() Determines if the user space exists.
byte	getInitialValue() Returns the initial value used for filling in the user space during creation and extension.
int	getLength() Returns the size (in bytes) of the user space.
String	getName() Returns the user space name.
String	getPath() Returns the integrated file system path name of the object represented by the user space.
AS400	getSystem() Returns the system object for this user space.
boolean	isAutoExtendible() Indicates if the user space is auto extendible.
boolean	isMustUseProgramCall() Indicates if the Toolbox ProgramCall class will be used internally to perform user space read and write requests.
boolean	isMustUseSockets() Indicates whether sockets must be used when internally calling programs and commands.
int	read(byte[] dataBuffer, int userSpaceOffset) Reads up to dataBuffer.length bytes from the user space beginning at userSpaceOffset into dataBuffer.
int	read(byte[] dataBuffer, int userSpaceOffset, int dataOffset, int length) Reads up to length bytes from the user space beginning at userSpaceOffset into dataBuffer beginning at dataOffset.
String	read(int userSpaceOffset, int length) Returns a string from the user space beginning at userSpaceOffset.
void	removePropertyChangeListener(PropertyChangeListener listener) Removes this listener from being notified when a bound property changes.
void	removeUserSpaceListener(UserSpaceListener listener) Removes a listener from the UserSpace listeners list.
void	removeVetoableChangeListener(VetoableChangeListener listener) Removes this listener from being notified when a constrained property changes.
void	setAutoExtendible(boolean autoExtendibility) Sets the auto extend attribute if possible.
void	setInitialValue(byte initialValue) Sets the initial value to be used during user space creation or extension.
void	setLength(int length) Sets the size (in bytes) of the user space.
void	setMustUseProgramCall(boolean useProgramCall) Specifies the API set that is used to perform user space read and write operations.
void	setMustUseSockets(boolean mustUseSockets) Sets this object to using sockets.
void	setPath(String path) Sets the path for the user space.
void	setSystem(AS400 system) Sets the system object for the user space.
void	write(byte[] dataBuffer, int userSpaceOffset) Writes up to dataBuffer.length bytes from dataBuffer into the user space beginning at userSpaceOffset.
void	write(byte[] dataBuffer, int userSpaceOffset, int dataOffset, int length) Writes up to length bytes from dataBuffer beginning at dataOffset into the user space beginning at userSpaceOffset.
void	write(byte[] dataBuffer, int userSpaceOffset, int dataOffset, int length, int forceAuxiliary) Writes up to length bytes from dataBuffer beginning at dataOffset into the user space beginning at userSpaceOffset.
void	write(String data, int userSpaceOffset) Writes a string into the user space beginning at userSpaceOffset.

Methods inherited from class java.lang.Object

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

Field Detail

FORCE_ASYNCHRONOUS

public static final int FORCE_ASYNCHRONOUS

Force to auxiliary storage option that allows changes to be forced asynchronously.

See Also:

Constant Field Values

FORCE_NONE

public static final int FORCE_NONE

Force to auxiliary storage option that does not allow changes to be forced. It uses normal system writes.

See Also:

Constant Field Values

FORCE_SYNCHRONOUS

public static final int FORCE_SYNCHRONOUS

Force to auxiliary storage option that allows changes to be forced synchronously.

See Also:

Constant Field Values

DOMAIN_DEFAULT

public static final String DOMAIN_DEFAULT

Constant representing the default domain for the user space. The QALWUSRDMN system value is used to determine the domain.

See Also:

Constant Field Values

DOMAIN_USER

public static final String DOMAIN_USER

Constant indicating the domain for the user space is *USER.

See Also:

Constant Field Values

DOMAIN_SYSTEM

public static final String DOMAIN_SYSTEM

Constant indicating the domain for the user space is *SYSTEM.

See Also:

Constant Field Values

Constructor Detail

UserSpace

public UserSpace()

Constructs a UserSpace object. The system and path properties must be set before using any method requiring a connection to the system.

UserSpace

public UserSpace(AS400 system,
                 String path)

Constructs a UserSpace object. It creates a UserSpace instance that represents the user space path on system.

Parameters:

system - The system that contains the user space.

path - The fully qualified integrated file system path name to the user space.

Method Detail

addPropertyChangeListener

public void addPropertyChangeListener(PropertyChangeListener listener)

Adds a listener to be notified when the value of any bound property is changed. It can be removed with removePropertyChangeListener().

Parameters:

listener - The listener object.

addUserSpaceListener

public void addUserSpaceListener(UserSpaceListener listener)

Adds a listener to be notified when a UserSpaceEvent is fired.

Parameters:

listener - The listener object.

addVetoableChangeListener

public void addVetoableChangeListener(VetoableChangeListener listener)

Adds a listener to be notified when the value of any constrained property is changed.

Parameters:

listener - The listener object.

close

public void close()
           throws IOException

Closes the user space and releases any system resources associated with the stream. Note: Closing the user space does not delete it. It simply closes this UserSpace object's file stream connection to the user space.

Throws:

IOException

See Also:

delete()

create

public void create(int length,
                   boolean replace,
                   String extendedAttribute,
                   byte initialValue,
                   String textDescription,
                   String authority)
            throws AS400SecurityException,
                   ErrorCompletingRequestException,
                   InterruptedException,
                   IOException,
                   ObjectDoesNotExistException

Creates the user space.

Parameters:

length - The initial size (in bytes) of the user space. Valid values are 1 through 16,776,704. User spaces with lengths of 16,773,120 or less will be created with optimum space alignment. These user spaces can not be resized to greater than 16,773,120 bytes. For performance, lengths of 16,773,120 or less are recommended.

replace - The value indicating if an existing user space is to be replaced.

extendedAttribute - The user-defined extended attribute of the user space. This string must be 10 characters or less.

initialValue - The value used in creation and extension.

textDescription - The text describing the user space. This string must be 50 characters or less.

authority - The public authority for the user space. This string must be 10 characters or less. Valid values are:

• *ALL
• *CHANGE
• *EXCLUDE
• *LIBCRTAUT
• *USE
• authorization-list name

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

create

public void create(String domain,
                   int length,
                   boolean replace,
                   String extendedAttribute,
                   byte initialValue,
                   String textDescription,
                   String authority)
            throws AS400SecurityException,
                   ErrorCompletingRequestException,
                   InterruptedException,
                   IOException,
                   ObjectDoesNotExistException

Creates the user space.

Parameters:

domain - The domain into which the user space is created. Valid value are:

• DOMAIN_DEFAULT
• DOMAIN_USER
• DOMAIN_SYSTEM

length - The initial size (in bytes) of the user space. Valid values are 1 through 16,776,704. User spaces with lengths of 16,773,120 or less will be created with optimum space alignment. These user spaces can not be resized to greater than 16,773,120 bytes. For performance, lengths of 16,773,120 or less are recommended.

replace - The value indicating if an existing user space is to be replaced.

extendedAttribute - The user-defined extended attribute of the user space. This string must be 10 characters or less.

initialValue - The value used in creation and extension.

textDescription - The text describing the user space. This string must be 50 characters or less.

authority - The public authority for the user space. This string must be 10 characters or less. Valid values are:

• *ALL
• *CHANGE
• *EXCLUDE
• *LIBCRTAUT
• *USE
• authorization-list name

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

delete

public void delete()
            throws AS400SecurityException,
                   ErrorCompletingRequestException,
                   InterruptedException,
                   IOException,
                   ObjectDoesNotExistException

Deletes the user space.

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

exists

public boolean exists()
               throws AS400SecurityException,
                      ErrorCompletingRequestException,
                      InterruptedException,
                      IOException

Determines if the user space exists.

Returns:

true if the user space exists; false otherwise.

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

getInitialValue

public byte getInitialValue()
                     throws AS400SecurityException,
                            ErrorCompletingRequestException,
                            InterruptedException,
                            IOException,
                            ObjectDoesNotExistException

Returns the initial value used for filling in the user space during creation and extension.

Returns:

The initial value used during user space creation and extension.

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

getLength

public int getLength()
              throws AS400SecurityException,
                     ErrorCompletingRequestException,
                     InterruptedException,
                     IOException,
                     ObjectDoesNotExistException

Returns the size (in bytes) of the user space.

Returns:

The size (in bytes) of the user space.

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

getName

public String getName()

Returns the user space name.

Returns:

The name of the user space.

getPath

public String getPath()

Returns the integrated file system path name of the object represented by the user space.

Returns:

The integrated file system path name of the object represented by the user space.

getSystem

public AS400 getSystem()

Returns the system object for this user space.

Returns:

The system object for this user space.

isAutoExtendible

public boolean isAutoExtendible()
                         throws AS400SecurityException,
                                ErrorCompletingRequestException,
                                InterruptedException,
                                IOException,
                                ObjectDoesNotExistException

Indicates if the user space is auto extendible. When running on a system other than the system that contains the user space, the auto extend attribute is always true and cannot be changed, so the attribute value returned should be ignored. The auto extend attribute can be used when running on the same system as the user space with the optimizations that are a part of the operating system.

Returns:

true if the user space is auto extendible; false otherwise.

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

isMustUseProgramCall

public boolean isMustUseProgramCall()

Indicates if the Toolbox ProgramCall class will be used internally to perform user space read and write requests. If false, Toolbox Integrated File System classes will be used to perform user space read and write requests.

Returns:

true if user space read and write requests will be performed via program call; false otherwise.

See Also:

setMustUseProgramCall(boolean)

read

public int read(byte[] dataBuffer,
                int userSpaceOffset)
         throws AS400SecurityException,
                ErrorCompletingRequestException,
                InterruptedException,
                IOException,
                ObjectDoesNotExistException

Reads up to dataBuffer.length bytes from the user space beginning at userSpaceOffset into dataBuffer.

Parameters:

dataBuffer - The buffer to fill with data. Buffer.length() bytes will be read from the user space.

userSpaceOffset - The offset in the user space from which to start reading.

Returns:

The total number of bytes read into the buffer, or -1 if the userSpaceOffset is beyond the end of the user space.

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

read

public int read(byte[] dataBuffer,
                int userSpaceOffset,
                int dataOffset,
                int length)
         throws AS400SecurityException,
                ErrorCompletingRequestException,
                InterruptedException,
                IOException,
                ObjectDoesNotExistException

Reads up to length bytes from the user space beginning at userSpaceOffset into dataBuffer beginning at dataOffset.

Parameters:

dataBuffer - The buffer to fill with data.

userSpaceOffset - The offset in the user space from which to start reading.

dataOffset - The starting offset in the data buffer for the results of the read.

length - The number of bytes to read.

Returns:

The total number of bytes read into the buffer, or -1 if the userSpaceOffset is beyond the end of the user space.

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

read

public String read(int userSpaceOffset,
                   int length)
            throws AS400SecurityException,
                   ErrorCompletingRequestException,
                   InterruptedException,
                   IOException,
                   ObjectDoesNotExistException

Returns a string from the user space beginning at userSpaceOffset. Data is read from the user space as if by the read(byte[], int, int, int) method. The resulting byte array is then converted into a String.

Parameters:

userSpaceOffset - The offset in the user space from which to start reading.

length - The number of bytes to read.

Returns:

The string value from the user space.

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

removePropertyChangeListener

public void removePropertyChangeListener(PropertyChangeListener listener)

Removes this listener from being notified when a bound property changes.

Parameters:

listener - The listener object.

removeUserSpaceListener

public void removeUserSpaceListener(UserSpaceListener listener)

Removes a listener from the UserSpace listeners list.

Parameters:

listener - The listener object.

removeVetoableChangeListener

public void removeVetoableChangeListener(VetoableChangeListener listener)

Removes this listener from being notified when a constrained property changes.

Parameters:

listener - The listener object.

setAutoExtendible

public void setAutoExtendible(boolean autoExtendibility)
                       throws AS400SecurityException,
                              ErrorCompletingRequestException,
                              InterruptedException,
                              IOException,
                              ObjectDoesNotExistException

Sets the auto extend attribute if possible. When running on a system other than the system that contains the user space, the auto extend attribute cannot be set, so this method is ignored and auto extend is always true. Auto extend can be set when running on the same system as the user space with the optimizations that are a part of the operating system.

Parameters:

autoExtendibility - The attribute for user space auto extendibility.

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

setInitialValue

public void setInitialValue(byte initialValue)
                     throws AS400SecurityException,
                            ErrorCompletingRequestException,
                            InterruptedException,
                            IOException,
                            ObjectDoesNotExistException

Sets the initial value to be used during user space creation or extension.

Parameters:

initialValue - The new initial value used during future extensions. For best performance, set to zero.

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

setLength

public void setLength(int length)
               throws AS400SecurityException,
                      ErrorCompletingRequestException,
                      InterruptedException,
                      IOException,
                      ObjectDoesNotExistException

Sets the size (in bytes) of the user space.

Parameters:

length - The new size (in bytes) of the user space. Valid values are 1 through 16,776,704. User spaces with lengths of 16,773,120 or less, created with optimum space alignment, can not be resized to greater than 16,773,120 bytes. For performance, lengths of 16,773,120 or less are recommended.

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

setMustUseProgramCall

public void setMustUseProgramCall(boolean useProgramCall)

Specifies the API set that is used to perform user space read and write operations. This method is useful when using ProgramCall or CommandCall objects in conjunction with user spaces. If false (the default), read and write requests are made via the File Server; internally, an IFSRandomAccessFile object is used to perform read and write requests. If true, internally a ProgramCall object is used to perform read and write requests, which are made via the Remote Command Host Server. In general, requests made via the File object are faster, but the behavior of requests made via a ProgramCall object is more consistent with user space API's.

If accessing user spaces located in QTEMP, it is strongly advised that setMustUseProgramCall(true) be called. In addition, depending on whether subsequent accesses of the user space (such as by program calls) will be run on- or off-thread, you should also call setMustUseSockets(true).

This property cannot be reset once a connection has been established.

Parameters:

useProgramCall - Internally use ProgramCall to perform read and write requests.

See Also:

isMustUseProgramCall()

setPath

public void setPath(String path)
             throws PropertyVetoException

Sets the path for the user space. The path can only be set before a connection has been established.

Parameters:

path - The fully qualified integrated file system path name to the user space.

Throws:

PropertyVetoException - If the change is vetoed.

setSystem

public void setSystem(AS400 system)
               throws PropertyVetoException

Sets the system object for the user space. The system can only be set before a connection has been established.

Parameters:

system - The system that contains the user space.

Throws:

PropertyVetoException - If the change is vetoed.

write

public void write(byte[] dataBuffer,
                  int userSpaceOffset)
           throws AS400SecurityException,
                  ErrorCompletingRequestException,
                  InterruptedException,
                  IOException,
                  ObjectDoesNotExistException

Writes up to dataBuffer.length bytes from dataBuffer into the user space beginning at userSpaceOffset.

Parameters:

dataBuffer - The data buffer to be written to the user space.

userSpaceOffset - The position in the user space to start writing.

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

write

public void write(byte[] dataBuffer,
                  int userSpaceOffset,
                  int dataOffset,
                  int length)
           throws AS400SecurityException,
                  ErrorCompletingRequestException,
                  InterruptedException,
                  IOException,
                  ObjectDoesNotExistException

Writes up to length bytes from dataBuffer beginning at dataOffset into the user space beginning at userSpaceOffset.

Parameters:

dataBuffer - The data buffer to be written to the user space.

userSpaceOffset - The position in the user space to start writing.

dataOffset - The position in the write data buffer from which to start copying.

length - The length (in bytes) of data to be written.

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

write

public void write(byte[] dataBuffer,
                  int userSpaceOffset,
                  int dataOffset,
                  int length,
                  int forceAuxiliary)
           throws AS400SecurityException,
                  ErrorCompletingRequestException,
                  InterruptedException,
                  IOException,
                  ObjectDoesNotExistException

Writes up to length bytes from dataBuffer beginning at dataOffset into the user space beginning at userSpaceOffset.

Parameters:

dataBuffer - The data buffer to be written to the user space.

userSpaceOffset - The position in the user space to start writing.

dataOffset - The position in the write data buffer from which to start copying.

length - The length (in bytes) of data to be written.

forceAuxiliary - The method of forcing changes made to the user space to auxiliary storage. Valid values are:

• FORCE_NONE
• FORCE_ASYNCHRONOUS
• FORCE_SYNCHRONOUS

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

write

public void write(String data,
                  int userSpaceOffset)
           throws AS400SecurityException,
                  ErrorCompletingRequestException,
                  InterruptedException,
                  IOException,
                  ObjectDoesNotExistException

Writes a string into the user space beginning at userSpaceOffset. String is converted into bytes and written to the user space as if by the write(byte[], int) method.

Parameters:

data - The data buffer to be written to the user space.

userSpaceOffset - The position in the user space to start writing.

Throws:

AS400SecurityException - If a security or authority error occurs.

ErrorCompletingRequestException - If an error occurs before the request is completed.

InterruptedException - If this thread is interrupted.

IOException - If an error occurs while communicating with the system.

ObjectDoesNotExistException - If the object does not exist on the system.

setMustUseSockets

public void setMustUseSockets(boolean mustUseSockets)

Sets this object to using sockets. This method is useful when running directly on IBM i, using ProgramCall or CommandCall objects in conjunction with user spaces. When your Java program runs on the IBM i system, some Toolbox classes access data via a direct API call instead of making a socket call to the system (for example, to the Remote Command Host Server). There are minor differences in the behavior of the classes when they use direct API calls instead of socket calls. If your program is affected by these differences you can use this method to force the Toolbox classes to use socket calls instead of direct API calls. The default is false.

Note: This method has no effect if the Java application is running remotely, that is, not running directly on an IBM i system. When running remotely, the Toolbox submits all program and command calls via sockets, regardless of the setting of this property.

This property cannot be reset once a connection has been established.

Parameters:

mustUseSockets - true to use sockets; false otherwise.

See Also:

isMustUseSockets(), CommandCall.setThreadSafe(Boolean), ProgramCall.setThreadSafe(boolean)

isMustUseSockets

public boolean isMustUseSockets()

Indicates whether sockets must be used when internally calling programs and commands. When your Java program runs on the system, some Toolbox classes access data via a direct call to an API instead of making a socket call to the system (for example, to the Remote Command Host Server). There are minor differences in the behavior of the classes when they use direct API calls instead of socket calls. If your program is affected by these differences you can check whether this object will use socket calls instead of API calls by using this method.

Returns:

true if this object must use sockets; false otherwise.

See Also:

setMustUseSockets(boolean)