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package tools;
import io.confluent.kafka.schemaregistry.client.CachedSchemaRegistryClient;
import io.confluent.kafka.schemaregistry.client.SchemaRegistryClient;
import org.apache.avro.Schema;
import org.apache.avro.SchemaBuilder;
public class SchemaRegistryTest {
private static final String SCHEMA_REGISTRY_URL = "http://localhost:8081";
public static void main(String[] args) {
System.out.println("================================================================================");
System.out.println("Schema Registry Test - Verifying In-Memory Read Optimization");
System.out.println("================================================================================\n");
SchemaRegistryClient schemaRegistry = new CachedSchemaRegistryClient(SCHEMA_REGISTRY_URL, 100);
boolean allTestsPassed = true;
try {
// Test 1: Register first schema
System.out.println("Test 1: Registering first schema (user-value)...");
Schema userValueSchema = SchemaBuilder
.record("User").fields()
.requiredString("name")
.requiredInt("age")
.endRecord();
long startTime = System.currentTimeMillis();
int schema1Id = schemaRegistry.register("user-value", userValueSchema);
long elapsedTime = System.currentTimeMillis() - startTime;
System.out.println("✓ SUCCESS: Schema registered with ID: " + schema1Id + " (took " + elapsedTime + "ms)");
// Test 2: Register second schema immediately (tests read-after-write)
System.out.println("\nTest 2: Registering second schema immediately (user-key)...");
Schema userKeySchema = SchemaBuilder
.record("UserKey").fields()
.requiredString("userId")
.endRecord();
startTime = System.currentTimeMillis();
int schema2Id = schemaRegistry.register("user-key", userKeySchema);
elapsedTime = System.currentTimeMillis() - startTime;
System.out.println("✓ SUCCESS: Schema registered with ID: " + schema2Id + " (took " + elapsedTime + "ms)");
// Test 3: Rapid fire registrations (tests concurrent writes)
System.out.println("\nTest 3: Rapid fire registrations (10 schemas in parallel)...");
startTime = System.currentTimeMillis();
Thread[] threads = new Thread[10];
final boolean[] results = new boolean[10];
for (int i = 0; i < 10; i++) {
final int index = i;
threads[i] = new Thread(() -> {
try {
Schema schema = SchemaBuilder
.record("Test" + index).fields()
.requiredString("field" + index)
.endRecord();
schemaRegistry.register("test-" + index + "-value", schema);
results[index] = true;
} catch (Exception e) {
System.err.println("✗ ERROR in thread " + index + ": " + e.getMessage());
results[index] = false;
}
});
threads[i].start();
}
for (Thread thread : threads) {
thread.join();
}
elapsedTime = System.currentTimeMillis() - startTime;
int successCount = 0;
for (boolean result : results) {
if (result) successCount++;
}
if (successCount == 10) {
System.out.println("✓ SUCCESS: All 10 schemas registered (took " + elapsedTime + "ms total, ~" + (elapsedTime / 10) + "ms per schema)");
} else {
System.out.println("✗ PARTIAL FAILURE: Only " + successCount + "/10 schemas registered");
allTestsPassed = false;
}
// Test 4: Verify we can retrieve all schemas
System.out.println("\nTest 4: Verifying all schemas are retrievable...");
startTime = System.currentTimeMillis();
Schema retrieved1 = schemaRegistry.getById(schema1Id);
Schema retrieved2 = schemaRegistry.getById(schema2Id);
elapsedTime = System.currentTimeMillis() - startTime;
if (retrieved1.equals(userValueSchema) && retrieved2.equals(userKeySchema)) {
System.out.println("✓ SUCCESS: All schemas retrieved correctly (took " + elapsedTime + "ms)");
} else {
System.out.println("✗ FAILURE: Schema mismatch");
allTestsPassed = false;
}
// Summary
System.out.println("\n===============================================================================");
if (allTestsPassed) {
System.out.println("✓ ALL TESTS PASSED!");
System.out.println("===============================================================================");
System.out.println("\nOptimization verified:");
System.out.println("- ForceFlush is NO LONGER NEEDED");
System.out.println("- Subscribers read from in-memory buffer using IsOffsetInMemory()");
System.out.println("- Per-subscriber notification channels provide instant wake-up");
System.out.println("- True concurrent writes without serialization");
System.exit(0);
} else {
System.out.println("✗ SOME TESTS FAILED");
System.out.println("===============================================================================");
System.exit(1);
}
} catch (Exception e) {
System.err.println("\n✗ FATAL ERROR: " + e.getMessage());
e.printStackTrace();
System.exit(1);
}
}
}
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