ProxyFileDescriptorCallback
public
abstract
class
ProxyFileDescriptorCallback
extends Object
Callback that handles file system requests from ProxyFileDescriptor.
All callback methods except for onRelease should throw ErrnoException
with proper errno on errors. See
errno(3) and
OsConstants.
Typical errnos are
EIO for general I/O issues
ENOENT when the file is not found
EBADF if the file doesn't allow read/write operations
based on how it was opened. (For example, trying to write a file that was opened read-only.)
ENOSPC if you cannot handle a write operation to
space/quota limitations.
Summary
Public methods |
|---|
void
|
onFsync()
Ensures all the written data are stored in permanent storage device.
|
long
|
onGetSize()
Returns size of bytes provided by the file descriptor.
|
int
|
onRead(long offset, int size, byte[] data)
Provides bytes read from file descriptor.
|
abstract
void
|
onRelease()
Invoked after the file is closed.
|
int
|
onWrite(long offset, int size, byte[] data)
Handles bytes written to file descriptor.
|
Inherited methods |
|---|
From
class
java.lang.Object
Object
|
clone()
Creates and returns a copy of this object.
|
boolean
|
equals(Object obj)
Indicates whether some other object is "equal to" this one.
|
void
|
finalize()
Called by the garbage collector on an object when garbage collection
determines that there are no more references to the object.
|
final
Class<?>
|
getClass()
Returns the runtime class of this Object.
|
int
|
hashCode()
Returns a hash code value for the object.
|
final
void
|
notify()
Wakes up a single thread that is waiting on this object's
monitor.
|
final
void
|
notifyAll()
Wakes up all threads that are waiting on this object's monitor.
|
String
|
toString()
Returns a string representation of the object.
|
final
void
|
wait(long millis, int nanos)
Causes the current thread to wait until another thread invokes the
notify() method or the
notifyAll() method for this object, or
some other thread interrupts the current thread, or a certain
amount of real time has elapsed.
|
final
void
|
wait(long millis)
Causes the current thread to wait until either another thread invokes the
notify() method or the
notifyAll() method for this object, or a
specified amount of time has elapsed.
|
final
void
|
wait()
Causes the current thread to wait until another thread invokes the
notify() method or the
notifyAll() method for this object.
|
|
Public constructors
ProxyFileDescriptorCallback
ProxyFileDescriptorCallback ()
Public methods
onFsync
void onFsync ()
Ensures all the written data are stored in permanent storage device.
For example, if it has data stored in on memory cache, it needs to flush data to storage
device.
| Throws |
|---|
ErrnoException |
ErrnoException containing E constants in OsConstants.
|
onGetSize
long onGetSize ()
Returns size of bytes provided by the file descriptor.
| Returns |
|---|
long |
Size of bytes. |
| Throws |
|---|
ErrnoException |
ErrnoException containing E constants in OsConstants.
|
onRead
int onRead (long offset,
int size,
byte[] data)
Provides bytes read from file descriptor.
It needs to return exact requested size of bytes unless it reaches file end.
| Parameters |
|---|
offset |
long: Offset in bytes from the file head specifying where to read bytes. If a seek
operation is conducted on the file descriptor, then a read operation is requested, the
offset refrects the proper position of requested bytes. |
size |
int: Size for read bytes. |
data |
byte: Byte array to store read bytes. |
| Returns |
|---|
int |
Size of bytes returned by the function. |
| Throws |
|---|
ErrnoException |
ErrnoException containing E constants in OsConstants.
|
onRelease
void onRelease ()
Invoked after the file is closed.
onWrite
int onWrite (long offset,
int size,
byte[] data)
Handles bytes written to file descriptor.
| Parameters |
|---|
offset |
long: Offset in bytes from the file head specifying where to write bytes. If a seek
operation is conducted on the file descriptor, then a write operation is requested, the
offset refrects the proper position of requested bytes. |
size |
int: Size for write bytes. |
data |
byte: Byte array to be written to somewhere. |
| Returns |
|---|
int |
Size of bytes processed by the function. |
| Throws |
|---|
ErrnoException |
ErrnoException containing E constants in OsConstants.
|
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