Object Store: Single Instance

This example showcases the object store capabilities with a single HiCR instance in the system. The code is structured as follows:

• source/ contains the different variants of this example corresponding to different backends

  • main.cpp corresponds to the HWLoc and Pthreads backends implementation

Data object creation

First, we create a DataObject from a local memory slot:

// Allocate local memory slot
auto myBlockSlot = memoryManager->allocateLocalMemorySlot(memSpace, 4096);

// Initialize the block with a ASCII representation of 'R'
char *myBlockData = (char *)myBlockSlot->getPointer();
myBlockData[0] = 82;

// Publish the block with arbitrary ID 1
std::shared_ptr<HiCR::objectStore::DataObject> myBlock = objectStoreManager.createObject(myBlockSlot, 1);

Publish data object

Then, we publish it. That is, make it avaialable for retrieval:

objectStoreManager.publish(myBlock);

Get data object

Then, we get it:

// Get the raw pointers through the block
char *myBlockData1 = (char *)objectStoreManager.get(*myBlock)->getPointer();

The output should be:

Block 1: R

We do it again by modifying the buffer content first, and then testing out data object copying capabilities.

Destroy data object

Finally, we destroy the data object:

// Delete the data object
objectStoreManager.destroy(*myBlock2);

The complete output should be:

Block 1: R
Block 2: S
Copy of a Custom Block: Test