/// <summary>
/// Sample code that uses this VirtualCache.
/// </summary>
public static void Run()
{
Console.WriteLine("{0}: Virtual Cache demo started...", DateTime.Now);
VirtualCacheGenerics vc = new VirtualCacheGenerics();
ISortedDictionary <int, Person> cache1 = vc.GetObjectCache(1);
const int MaxCount = 40000;
for (int i = 0; i < MaxCount; i++)
{
Person p = new Person();
p.FirstName = string.Format("Joe{0}", i);
p.LastName = "Castanas";
p.PhoneNumber = "510-324-2222";
p.Address = string.Format("5434 {0} Coventry Court, Fremont, Ca. 94888, U.S.A.", i);
cache1.Add(i, p);
}
Console.WriteLine("{0}: Finished inserting {1} records, reading 'em starts now...", DateTime.Now, MaxCount);
cache1.MoveFirst();
cache1.HintSequentialRead = true;
for (int i = 0; i < MaxCount; i++)
{
Person p = cache1.CurrentValue;
if (p == null ||
p.FirstName != string.Format("Joe{0}", i))
{
Console.WriteLine("Error, data for iteration {0} not found.", i);
}
cache1.MoveNext();
}
Console.WriteLine("{0}: Virtual Cache demo ended... {1} records were read.", DateTime.Now, MaxCount);
}
// "Bulk" read all Person and Address records from respective Stores...
private void Read(ISortedDictionary <PersonKey, Person> PeopleStore,
ISortedDictionary <int, Address> AddressStore, int MaxCount)
{
PeopleStore.MoveFirst();
// tell People Store it can do read ahead of 77 Persons.
PeopleStore.HintBatchCount = 77;
AddressStore.MoveFirst();
// tell Address Store it can do read ahead of 78 Addresses.
AddressStore.HintBatchCount = 78;
KeyValuePair <int, int>[] AddressIDs = new KeyValuePair <int, int> [AddressBatchCount];
int AddressBatchIndex = 0;
for (int i = 1; i <= MaxCount; i++)
{
Person p = PeopleStore.CurrentValue;
if (p.FirstName != string.Format("Joe{0}", i))
{
Console.WriteLine("Error detected, expected Joe{0} not found in this sequence from disk", i);
}
else
{
AddressIDs[AddressBatchIndex++] = new KeyValuePair <int, int>(p.AddressID, i);
if (AddressBatchIndex == AddressBatchCount)
{
int[] a2 = new int[AddressBatchCount];
for (int i2 = 0; i2 < AddressBatchCount; i2++)
{
a2[i2] = AddressIDs[i2].Key;
}
// Query a batch of 1000 addresses. NOTE: doing batch query is optimal operation
// as it minimizes segment jumps of the HDD "disk head".
QueryResult <int>[] Addresses;
if (AddressStore.Query(QueryExpression <int> .Package(a2), out Addresses))
{
for (int i2 = 0; i2 < AddressBatchCount; i2++)
{
Address addr = (Address)Addresses[i2].Value;
if (addr == null ||
addr.Street != string.Format("143{0} LoveLane", AddressIDs[i2].Value))
{
Console.WriteLine("Error detected, expected Address 143{0} not found in this sequence from disk",
AddressIDs[i2].Value);
}
}
}
AddressBatchIndex = 0;
}
}
PeopleStore.MoveNext();
}
if (!PeopleStore.EndOfTree())
{
Console.WriteLine("Expected EOT but isn't.");
}
Console.WriteLine("Reading all data({0}) ended.", MaxCount);
}
static void ReadRecords(ISortedDictionary <int, Person> store, int MaxCount, string Salt)
{
store.MoveFirst();
store.HintBatchCount = 99;
for (int i = 0; i < MaxCount; i++)
{
Person p = store.CurrentValue;
if (p == null ||
p.FirstName != string.Format("Joe{0}{1}", i, Salt))
{
Console.WriteLine("Error, data for iteration {0} not found.", i);
}
store.MoveNext();
}
if (store.EndOfTree())
{
Console.WriteLine("Store's End of tree reached.");
}
}
void ReadAll(ISortedDictionary <long, Person> PeopleStore)
{
if (PeopleStore.MoveFirst())
{
PeopleStore.HintBatchCount = 103;
int Ctr = 0;
do
{
Ctr++;
Person p = PeopleStore.CurrentValue;
} while (PeopleStore.MoveNext());
if (Ctr != PeopleStore.Count)
{
Console.WriteLine("Failed! Read {0}, expected {1}", Ctr, PeopleStore.Count);
}
else
{
Console.WriteLine("Read {0} items.", Ctr);
}
}
}
void ReadAll(ISortedDictionary <int, Person> PeopleStore,
ISortedDictionary <int, Address> AddressStore, int MaxCount)
{
Console.WriteLine("{0}: Start reading {1} records.", DateTime.Now, PeopleStore.Count);
PeopleStore.MoveFirst();
PeopleStore.HintBatchCount = 200;
int[] Aids = new int[1000];
int AidsIndex = 0;
int Ctr = 0;
while (!PeopleStore.EndOfTree())
{
Ctr++;
Person p = PeopleStore.CurrentValue;
if (p == null)
{
throw new InvalidOperationException("Person record not found.");
}
Aids[AidsIndex++] = p.AddressID;
if (AidsIndex == 1000)
{
//** Do batch Query in set of 1000 Addresses... here we're fully utilizing SOP/disk buffers
//** and minimizes file pointer jumps
QueryResult <int>[] addressFound;
if (AddressStore.Query(QueryExpression <int> .Package(Aids), out addressFound))
{
foreach (QueryResult <int> v in addressFound)
{
if (!v.Found)
{
Console.WriteLine("Address '{0}' not found.", v.Key);
}
}
}
AidsIndex = 0;
}
if (!PeopleStore.MoveNext())
{
break;
}
if (Ctr > PeopleStore.Count + 4)
{
Console.WriteLine("Error... Ctr > People Count.");
break;
}
}
if (AidsIndex > 0)
{
int[] Aids2 = new int[AidsIndex];
Array.Copy(Aids, 0, Aids2, 0, AidsIndex);
QueryResult <int>[] AddressFound;
if (AddressStore.Query(QueryExpression <int> .Package(Aids2), out AddressFound))
{
foreach (QueryResult <int> v in AddressFound)
{
if (!v.Found)
{
Console.WriteLine("Address '{0}' not found.", v.Key);
}
}
}
}
if (Ctr != PeopleStore.Count)
{
Console.WriteLine("Error, count of records doesn't match tree traversal count!");
}
else
{
Console.WriteLine("{0}: Finished reading {1} records.", DateTime.Now, PeopleStore.Count);
}
}
