void DB2Mon::getSnapshot(JNIEnv* env, sqlma *ma_ptr, Snapshot& snap)
{
int rc = 0; // return code
sqlca sqlca;
sqluint32 outputFormat;
// Determine the size of the snapshot
db2GetSnapshotSizeData getSnapshotSizeParam;
sqluint32 buffer_sz; // estimated buffer size
getSnapshotSizeParam.piSqlmaData = ma_ptr;
getSnapshotSizeParam.poBufferSize = &buffer_sz;
getSnapshotSizeParam.iVersion = SQLM_CURRENT_VERSION;
getSnapshotSizeParam.iNodeNumber = m_aggAllNodes ? SQLM_ALL_NODES : SQLM_CURRENT_NODE;
getSnapshotSizeParam.iSnapshotClass = SQLM_CLASS_DEFAULT;
rc = db2GetSnapshotSize(db2Version810, &getSnapshotSizeParam, &sqlca);
APICHECK(env, sqlca);
// Allocate memory to a buffer to hold snapshot monitor data.
// Add about 10k to make sure we avoid the reallocation below
buffer_sz = buffer_sz + SNAPSHOT_BUFFER_UNIT_SZ;
MemObj ptrBuffer(buffer_sz);
char * buffer_ptr = ptrBuffer.get();
sqlm_collected collected; // returned sqlm_collected structure
memset(&collected, '\0', sizeof(struct sqlm_collected));
db2GetSnapshotData getSnapshotParam;
getSnapshotParam.piSqlmaData = ma_ptr;
getSnapshotParam.poCollectedData = &collected;
getSnapshotParam.iBufferSize = buffer_sz;
getSnapshotParam.poBuffer = buffer_ptr;
getSnapshotParam.iVersion = SQLM_CURRENT_VERSION;
getSnapshotParam.iStoreResult = 0;
getSnapshotParam.iNodeNumber = m_aggAllNodes ? SQLM_ALL_NODES : SQLM_CURRENT_NODE;
getSnapshotParam.poOutputFormat = &outputFormat;
getSnapshotParam.iSnapshotClass = SQLM_CLASS_DEFAULT;
rc = db2GetSnapshot(db2Version810, &getSnapshotParam, &sqlca);
APICHECK(env, sqlca);
// If buffer was too small enlarge it and repeat until succeeded
while (sqlca.sqlcode == 1606)
{
buffer_sz = buffer_sz + SNAPSHOT_BUFFER_UNIT_SZ;
ptrBuffer.resize(buffer_sz);
buffer_ptr = ptrBuffer.get();
getSnapshotParam.iBufferSize = buffer_sz;
getSnapshotParam.poBuffer = buffer_ptr;
rc = db2GetSnapshot(db2Version810, &getSnapshotParam, &sqlca);
APICHECK(env, sqlca);
}
// Fill the snapshot object from the memory buffer
snap.initialize(env, buffer_ptr);
}
