public class RrdNioBackend extends RrdFileBackend
file| Modifier | Constructor | Description |
|---|---|---|
protected |
RrdNioBackend(String path,
boolean readOnly,
int syncPeriod) |
Creates RrdFileBackend object for the given file path, backed by
java.nio.* classes.
|
protected |
RrdNioBackend(String path,
boolean readOnly,
SyncManager syncManager) |
Creates RrdFileBackend object for the given file path, backed by
java.nio.* classes.
|
| Modifier and Type | Method | Description |
|---|---|---|
void |
close() |
Closes the underlying RRD file.
|
protected void |
finalize() |
|
protected void |
read(long offset,
byte[] b) |
Reads a number of bytes from the RRD file on the disk
|
protected void |
setLength(long newLength) |
Sets length of the underlying RRD file.
|
protected void |
sync() |
This method forces all data cached in memory but not yet stored in the
file, to be stored in it.
|
protected void |
write(long offset,
byte[] b) |
Writes bytes to the underlying RRD file on the disk
|
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitgetPath, isCachingAllowed, isInstanceCreated, isReadOnly, readAll, readDouble, readDouble, readInt, readLong, readString, writeDouble, writeDouble, writeDouble, writeInt, writeLong, writeStringgetCanonicalPath, getCanonicalPath, getLengthprotected RrdNioBackend(String path, boolean readOnly, int syncPeriod) throws IOException
SyncManager for each instance, which is very inefficient.
It is recommended that you instead use the
RrdNioBackend(String, boolean, SyncManager)
constructor instead.path - Path to a JRB file.readOnly - True, if file should be open in a read-only mode. False
otherwisesyncPeriod - How often (in seconds) to sync MMAP'd RRD data to diskIOException - Thrown in case of I/O errorprotected RrdNioBackend(String path, boolean readOnly, SyncManager syncManager) throws IOException
path - Path to a filereadOnly - True, if file should be open in a read-only mode. False
otherwise.syncManager - An object for managing synchronization of NIO-backed RRDs,
generally owned by the backend factory. If null, MMAP'd
data will only be synchronized to disk upon unmap. Note
that if the file is opened read-only, the SyncManager is
ignored. unmapFile()IOException - Thrown in case of I/O errorprotected void finalize()
throws Throwable
protected void setLength(long newLength)
throws IOException
setLength in class RrdFileBackendnewLength - Length of the RRD fileIOException - Thrown in case of I/O error.protected void write(long offset,
byte[] b)
throws IOException
write in class RrdFileBackendoffset - Starting file offsetb - Bytes to be written.IOException - Thrown in case of I/O errorprotected void read(long offset,
byte[] b)
throws IOException
read in class RrdFileBackendoffset - Starting file offsetb - Buffer which receives bytes read from the file.IOException - Thrown in case of I/O error.public void close()
throws IOException
close in class RrdFileBackendIOException - Thrown in case of I/O errorprotected void sync()