/**
* Create a new shard mapping.
*
* @param type method by which data is distributed to shards
* @param globalGroupName name of global group of the shard mapping
* @returns id of the new shard mapping.
*/
public int createShardMapping(ShardingType type, String globalGroupName)
throws FabricCommunicationException {
Response r =
errorSafeCallMethod(
METHOD_SHARDING_CREATE_DEFINITION, new Object[] {type.toString(), globalGroupName});
return (Integer) r.getResultSet().get(0).get(FIELD_RESULT);
}
/**
* Retrieve a set of complete shard mappings. The returned mappings include all information
* available about the mapping.
*
* @param shardMappingIdPattern the shard mapping id to retrieve
*/
public FabricStateResponse<Set<ShardMapping>> getShardMappings(String shardMappingIdPattern)
throws FabricCommunicationException {
int version = 0;
Object args[] = new Object[] {version, shardMappingIdPattern}; // common to all calls
Response mapsResponse = errorSafeCallMethod(METHOD_DUMP_SHARD_MAPS, args);
// use the lowest ttl of all the calls
long minExpireTimeMillis = System.currentTimeMillis() + (1000 * mapsResponse.getTtl());
// construct the maps
Set<ShardMapping> mappings = new HashSet<ShardMapping>();
for (Map rawMapping : mapsResponse.getResultSet()) {
int mappingId = (Integer) rawMapping.get(FIELD_MAPPING_ID);
ShardingType shardingType = ShardingType.valueOf((String) rawMapping.get(FIELD_TYPE_NAME));
String globalGroupName = (String) rawMapping.get(FIELD_GLOBAL_GROUP_ID);
FabricStateResponse<Set<ShardTable>> tables = getShardTables(mappingId);
FabricStateResponse<Set<ShardIndex>> indices = getShardIndices(mappingId);
if (tables.getExpireTimeMillis() < minExpireTimeMillis) {
minExpireTimeMillis = tables.getExpireTimeMillis();
}
if (indices.getExpireTimeMillis() < minExpireTimeMillis) {
minExpireTimeMillis = indices.getExpireTimeMillis();
}
ShardMapping m =
new ShardMappingFactory()
.createShardMapping(
mappingId, shardingType, globalGroupName, tables.getData(), indices.getData());
mappings.add(m);
}
return new FabricStateResponse<Set<ShardMapping>>(mappings, minExpireTimeMillis);
}
