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java.lang.Objectorg.rrd4j.core.RrdDbPool
public abstract class RrdDbPool
Field Summary | |
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static int |
INITIAL_CAPACITY
Initial capacity of the pool i.e. |
Constructor Summary | |
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RrdDbPool()
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Method Summary | |
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abstract int |
getCapacity()
Returns the maximum number of simultaneously open RRD files. |
static RrdDbPool |
getInstance()
Creates a single instance of the class on the first call, or returns already existing one. |
abstract int |
getOpenCount(RrdDb rrdDb)
Returns the number of usage for a RRD. |
abstract int |
getOpenCount(String path)
Returns the number of usage for a RRD. |
abstract int |
getOpenFileCount()
Returns the number of open RRD files. |
abstract String[] |
getOpenFiles()
Returns an array of open file names. |
abstract void |
release(RrdDb rrdDb)
Releases RrdDb reference previously obtained from the pool. |
abstract RrdDb |
requestRrdDb(RrdDef rrdDef)
Requests a RrdDb reference for the given RRD file definition object. |
abstract RrdDb |
requestRrdDb(String path)
Requests a RrdDb reference for the given RRD file path. |
abstract RrdDb |
requestRrdDb(String path,
String sourcePath)
Requests a RrdDb reference for the given path. |
abstract void |
setCapacity(int capacity)
Sets the maximum number of simultaneously open RRD files. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final int INITIAL_CAPACITY
Constructor Detail |
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public RrdDbPool()
Method Detail |
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public static RrdDbPool getInstance()
RuntimeException
- Thrown if the default RRD backend is not derived from the RrdFileBackendFactory
public abstract RrdDb requestRrdDb(String path) throws IOException
INITIAL_CAPACITY
, the file will be open and a new RrdDb reference will be returned.
If the file is not already open and the number of already open RRD files is equal to
INITIAL_CAPACITY
, the method blocks until some RRD file is closed.
path
- Path to existing RRD file
IOException
- Thrown in case of I/O errorpublic abstract RrdDb requestRrdDb(RrdDef rrdDef) throws IOException
INITIAL_CAPACITY
, a new RRD file will be created and a its RrdDb reference will be returned.
If the file is not already open and the number of already open RRD files is equal to
INITIAL_CAPACITY
, the method blocks until some RRD file is closed.
rrdDef
- Definition of the RRD file to be created
IOException
- Thrown in case of I/O errorpublic abstract RrdDb requestRrdDb(String path, String sourcePath) throws IOException
INITIAL_CAPACITY
, a new RRD file will be created and a its RrdDb reference will be returned.
If the file is not already open and the number of already open RRD files is equal to
INITIAL_CAPACITY
, the method blocks until some RRD file is closed.
path
- Path to RRD file which should be createdsourcePath
- Path to external data which is to be converted to Rrd4j's native RRD file format
IOException
- Thrown in case of I/O errorpublic abstract void release(RrdDb rrdDb) throws IOException
rrdDb
- RrdDb reference to be returned to the pool
IOException
- Thrown in case of I/O errorpublic abstract int getCapacity()
public abstract void setCapacity(int capacity)
capacity
- Maximum number of simultaneously open RRD files.public abstract String[] getOpenFiles()
public abstract int getOpenFileCount()
public abstract int getOpenCount(RrdDb rrdDb) throws IOException
rrdDb
- RrdDb reference for which informations is needed.
IOException
public abstract int getOpenCount(String path) throws IOException
path
- RRD file for which informations is needed.
IOException
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