java.lang.Object
- org.yamcs.parameter.ParameterCacheImpl

All Implemented Interfaces:

ParameterCache
```
public class ParameterCacheImpl
extends Object
implements ParameterCache
```
Used by the ParameterRequestManager to cache last values of parameters. The cache will contain the parameters for a predefined time period but can exceed that period if space is available in the CacheEntry. A CacheEntry also has a maximum size to prevent it accumulating parameters ad infinitum (e.g. if there are bogus parameters with the timestamp never changing) We keep delivery consisting of lists of parameter values together such that if two parameters have been acquired in the same delivery, they will be given from the same delivery to the clients. if cacheAll is enabled, all parameters will be cached as they are received. if cacheAll is disabled: - a parameter will be put on the list to cache only if somebody has requested it. - obviously first time when the parameter is requested, no value will be returned. - however this will greatly reduce the cache size since only a few parameters are monitored in the displays

Constructor Summary

Constructors
Constructor Description

ParameterCacheImpl(ParameterCacheConfig cacheConfig)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`clear()`	Remove all the parameters from the cache
`List<ParameterValue>`	`getAllValues(Parameter p)`	Returns all values from the cache for the parameter or null if there is no value cached The parameter are returned in descending order (newest parameter is returned first)
`List<ParameterValue>`	`getAllValues(Parameter p, long start, long stop)`	Same as above but return all values that have the generation time in the (start, stop] interval
`ParameterValue`	`getLastValue(Parameter p)`	Returns last cached value for parameter or null if there is no value in the cache
`List<ParameterValue>`	`getValues(List<Parameter> plist)`	Returns cached value for parameter or an empty list if there is no value in the cache
`void`	`update(Collection<ParameterValue> pvs)`	update the parameters in the cache

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ParameterCacheImpl
```
public ParameterCacheImpl(ParameterCacheConfig cacheConfig)
```
- Method Detail
  - update
```
public void update(Collection<ParameterValue> pvs)
```
    Description copied from interface: ParameterCache
    
    update the parameters in the cache
    
    Specified by:
    
    update in interface ParameterCache
    
    Parameters:
    
    pvs - - parameter value list
  - getValues
```
public List<ParameterValue> getValues(List<Parameter> plist)
```
    Description copied from interface: ParameterCache
    
    Returns cached value for parameter or an empty list if there is no value in the cache
    
    Specified by:
    
    getValues in interface ParameterCache
    
    Returns:
  - getLastValue
```
public ParameterValue getLastValue(Parameter p)
```
    Description copied from interface: ParameterCache
    
    Returns last cached value for parameter or null if there is no value in the cache
    
    Specified by:
    
    getLastValue in interface ParameterCache
    
    Parameters:
    
    p - - parameter for which the last value is returned
    
    Returns:
  - getAllValues
```
public List<ParameterValue> getAllValues(Parameter p)
```
    Description copied from interface: ParameterCache
    
    Returns all values from the cache for the parameter or null if there is no value cached The parameter are returned in descending order (newest parameter is returned first)
    
    Specified by:
    
    getAllValues in interface ParameterCache
    
    Parameters:
    
    p - - parameter for which all values are returned
    
    Returns:
    
    all values from the cache for the parameter or null if there is no value cached
  - getAllValues
```
public List<ParameterValue> getAllValues(Parameter p,
                                         long start,
                                         long stop)
```
    Description copied from interface: ParameterCache
    
    Same as above but return all values that have the generation time in the (start, stop] interval
    
    Specified by:
    
    getAllValues in interface ParameterCache
    
    Returns:
  - clear
```
public void clear()
```
    Description copied from interface: ParameterCache
    
    Remove all the parameters from the cache
    
    Specified by:
    
    clear in interface ParameterCache

Class ParameterCacheImpl

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ParameterCacheImpl

Method Detail

update

getValues

getLastValue

getAllValues

getAllValues

clear