/**
* Query all purchases made at a specific store for 3 specific products. This query uses
* cross-cache joins between {@link DimStore}, {@link DimProduct} objects stored in {@code
* 'replicated'} cache and {@link FactPurchase} objects stored in {@code 'partitioned'} cache.
*
* @throws IgniteException If failed.
*/
private static void queryProductPurchases() {
IgniteCache<Integer, FactPurchase> factCache = Ignition.ignite().cache(PARTITIONED_CACHE_NAME);
// All purchases for certain product made at store2.
// =================================================
DimProduct p1 = rand(dataProduct.values());
DimProduct p2 = rand(dataProduct.values());
DimProduct p3 = rand(dataProduct.values());
System.out.println(
"IDs of products [p1=" + p1.getId() + ", p2=" + p2.getId() + ", p3=" + p3.getId() + ']');
// Create cross cache query to get all purchases made at store2
// for specified products.
QueryCursor<Cache.Entry<Integer, FactPurchase>> prodPurchases =
factCache.query(
new SqlQuery(
FactPurchase.class,
"from \""
+ REPLICATED_CACHE_NAME
+ "\".DimStore, \""
+ REPLICATED_CACHE_NAME
+ "\".DimProduct, "
+ "\""
+ PARTITIONED_CACHE_NAME
+ "\".FactPurchase "
+ "where DimStore.id=FactPurchase.storeId and DimProduct.id=FactPurchase.productId "
+ "and DimStore.name=? and DimProduct.id in(?, ?, ?)")
.setArgs("Store2", p1.getId(), p2.getId(), p3.getId()));
printQueryResults(
"All purchases made at store2 for 3 specific products:", prodPurchases.getAll());
}
/**
* Populate cache with {@code 'facts'}, which in our case are {@link FactPurchase} objects.
*
* @param factCache Cache to populate.
* @throws IgniteException If failed.
*/
private static void populateFacts(Cache<Integer, FactPurchase> factCache) throws IgniteException {
for (int i = 0; i < 100; i++) {
int id = idGen++;
DimStore store = rand(dataStore.values());
DimProduct prod = rand(dataProduct.values());
factCache.put(id, new FactPurchase(id, prod.getId(), store.getId(), (i + 1)));
}
}
/**
* Cache preloader should call this method within partition lock.
*
* @param key Key.
* @param ver Version.
* @return {@code True} if preloading is permitted.
*/
public boolean preloadingPermitted(KeyCacheObject key, GridCacheVersion ver) {
assert key != null;
assert ver != null;
assert lock.isHeldByCurrentThread(); // Only one thread can enter this method at a time.
if (state() != MOVING) return false;
Map<KeyCacheObject, GridCacheVersion> evictHist0 = evictHist;
if (evictHist0 != null) {
GridCacheVersion ver0 = evictHist0.get(key);
// Permit preloading if version in history
// is missing or less than passed in.
return ver0 == null || ver0.isLess(ver);
}
return false;
}
/**
* @param key Key.
* @param ver Version.
*/
public void onEntryEvicted(KeyCacheObject key, GridCacheVersion ver) {
assert key != null;
assert ver != null;
assert lock.isHeldByCurrentThread(); // Only one thread can enter this method at a time.
if (state() != MOVING) return;
Map<KeyCacheObject, GridCacheVersion> evictHist0 = evictHist;
if (evictHist0 != null) {
GridCacheVersion ver0 = evictHist0.get(key);
if (ver0 == null || ver0.isLess(ver)) {
GridCacheVersion ver1 = evictHist0.put(key, ver);
assert ver1 == ver0;
}
}
}
/**
* Populate cache with {@code 'dimensions'} which in our case are {@link DimStore} and {@link
* DimProduct} instances.
*
* @param dimCache Cache to populate.
* @throws IgniteException If failed.
*/
private static void populateDimensions(Cache<Integer, Object> dimCache) throws IgniteException {
DimStore store1 = new DimStore(idGen++, "Store1", "12345", "321 Chilly Dr, NY");
DimStore store2 = new DimStore(idGen++, "Store2", "54321", "123 Windy Dr, San Francisco");
// Populate stores.
dimCache.put(store1.getId(), store1);
dimCache.put(store2.getId(), store2);
dataStore.put(store1.getId(), store1);
dataStore.put(store2.getId(), store2);
// Populate products
for (int i = 0; i < 20; i++) {
int id = idGen++;
DimProduct product = new DimProduct(id, "Product" + i, i + 1, (i + 1) * 10);
dimCache.put(id, product);
dataProduct.put(id, product);
}
}
