Hi Peter,
Thanks for your answer.
My issue :
-In a java program i use a hashtable, and this hashtable is to huge for memory.
-First i need to write data in this HDF5 structure.
-Secondly i need to read object {String , int, int} by key {string}.
I think that i can use HDF5 to serialize this structure in a table
{key,String,int,int} :
First a can read a file and for each line add a line in the HDF5 table.
After i need a fast access to this HDF5 table by key.
Thanks a lot for your help.
kim
2011/7/18 Peter Cao <[email protected]>:
> Kim,
>
> It would be very helpful if you can explain the issue in more details.
>
> My guess is that you are trying to read compound data with structure
> of {string, int} from HDF5 file into Java hashtable. Similar for writing.
>
> Currently, there is no direct way to read/write Java hashtable from/to HDF5
> files. There are a couple of ways that you can do.
> A) Implement your own Java and JNI write functions that can read/write
> hashtable, or
> B) Use H5CompoundDS to read data from file and create the hashtable
> once you have the data in memory, similar for write.
>
> Option A) will have better performance but it will need more work. Option B)
> does not need much work but it requires more memory and extra data
> conversion.
>
> Thanks
> --pc
>
> On 7/18/2011 1:21 PM, kim nguyen wrote:
>>
>> I am totally newbie with HDF.
>>
>> I want to use HDF5 to serialize a hashTable. This hashTable is to
>> large to be managed in memory and i want use HDF for read performance.
>>
>> The hash table have a String for key and a object (1 string and 2
>> int) for value.
>>
>> Have you a java sample code for create this structure, write data and read
>> data.
>>
>> Best regards
>>
>> kim
>>
>> France
>>
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