public interface DataStorageBuilder
The storage type can be different based on the size of the data. For example, it may be beneficial to store small amounts of data always in memory, for small overhead in access times, and to store larger objects on disk files, to avoid running out of memory.
Further, an implementing class may provide data storage objects that store data in disk files, for Java client applications, or e.g. in a relational database, for an EJB server environment where files are not allowed to be used.
DataStorage
Modifier and Type | Method and Description |
---|---|
DataStorage |
createCachedDataStorage(long size)
Get a data storage that is cached in memory, if possible, for the requested size of data.
|
DataStorage |
createDataStorage(DataStorage dataStorage)
Convert cached data storage to the appropriate normal data storage type.
|
DataStorage |
createDataStorage(long size)
Get an appropriate type of data storage for the requested size of data.
|
DataStorage createDataStorage(long size) throws ApfloatRuntimeException
Note that the returned data storage object is not set to have the
requested size, so the client should call the object's DataStorage.setSize(long)
method before storing data to it.
size
- The size of data to be stored in the storage, in bytes.DataStorage
object of an appropriate type for storing size
bytes of data.ApfloatRuntimeException
DataStorage createCachedDataStorage(long size) throws ApfloatRuntimeException
Note that the returned data storage object is not set to have the
requested size, so the client should call the object's DataStorage.setSize(long)
method before storing data to it.
size
- The size of data to be stored in the storage, in bytes.DataStorage
object of an appropriate type for storing size
bytes of data, cached if possible.ApfloatRuntimeException
DataStorage createDataStorage(DataStorage dataStorage) throws ApfloatRuntimeException
If the data storage already has the appropriate type for its size, the data
storage may be returned unchanged. The argument data storage does not necessarily
have to be created with the createCachedDataStorage(long)
method, it can
be created as well with the createDataStorage(long)
method.
If the given data storage does not have the appropriate type for its size, then a new data storage of the appropriate type is created and the data is copied to it.
dataStorage
- The data storage to be converted, if necessary.DataStorage
that can be the original data storage or a copy of it, with the appropriate type.ApfloatRuntimeException
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