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public interface Robin
Class to represent archive values for a single datasource. Robin class is the heart of the so-called "round robin database" concept. Basically, each Robin object is a fixed length array of double values. Each double value reperesents consolidated, archived value for the specific timestamp. When the underlying array of double values gets completely filled, new values will replace the oldest ones.
Robin object does not hold values in memory - such object could be quite large. Instead of it, Robin reads them from the backend I/O only when necessary.
Method Summary | |
---|---|
void |
bulkStore(double newValue,
int bulkCount)
|
void |
copyStateTo(org.rrd4j.core.RrdUpdater other)
Copies object's internal state to another Robin object. |
String |
dump()
|
void |
filterValues(double minValue,
double maxValue)
Filters values stored in this archive based on the given boundary. |
Archive |
getParent()
Returns the Archive object to which this Robin object belongs. |
org.rrd4j.core.RrdAllocator |
getRrdAllocator()
Required to implement RrdUpdater interface. |
RrdBackend |
getRrdBackend()
Returns the underlying storage (backend) object which actually performs all I/O operations. |
int |
getSize()
Returns the size of the underlying array of archived values. |
double |
getValue(int index)
Returns the i-th value from the Robin archive. |
double[] |
getValues()
Fetches all archived values. |
double[] |
getValues(int index,
int count)
|
void |
setValue(int index,
double value)
Sets the i-th value in the Robin archive. |
void |
setValues(double... newValues)
Updates archived values in bulk. |
void |
setValues(double newValue)
(Re)sets all values in this archive to the same value. |
void |
store(double newValue)
|
void |
update(double[] newValues)
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Method Detail |
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double[] getValues() throws IOException
IOException
- Thrown in case of I/O specific error.void setValues(double... newValues) throws IOException
newValues
- Array of double values to be stored in the archive
IOException
- Thrown in case of I/O error
IllegalArgumentException
- Thrown if the length of the input array is different from the length of
this archivevoid setValues(double newValue) throws IOException
newValue
- New value
IOException
- Thrown in case of I/O errordouble getValue(int index) throws IOException
index
- Value index
IOException
- Thrown in case of I/O specific error.void setValue(int index, double value) throws IOException
index
- index in the archive (the oldest value has zero index)value
- value to be stored
IOException
- Thrown in case of I/O specific error.Archive getParent()
int getSize()
void copyStateTo(org.rrd4j.core.RrdUpdater other) throws IOException
other
- New Robin object to copy state to
IOException
- Thrown in case of I/O errorvoid filterValues(double minValue, double maxValue) throws IOException
[minValue, maxValue]
interval (inclusive)
will be silently replaced with NaN
.
minValue
- lower boundarymaxValue
- upper boundary
IOException
- Thrown in case of I/O errorRrdBackend getRrdBackend()
org.rrd4j.core.RrdAllocator getRrdAllocator()
void update(double[] newValues) throws IOException
IOException
String dump() throws IOException
IOException
void store(double newValue) throws IOException
IOException
void bulkStore(double newValue, int bulkCount) throws IOException
IOException
double[] getValues(int index, int count) throws IOException
IOException
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