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Add rateLimiter to Driver3WorkerCQL #96

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Add rateLimiter to Driver3WorkerCQL #96

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17 changes: 17 additions & 0 deletions scylla-cdc-driver3/src/main/java/com/scylladb/cdc/cql/driver3/Driver3WorkerCQL.java
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.common.util.concurrent.RateLimiter;
import com.scylladb.cdc.cql.WorkerCQL;
import com.scylladb.cdc.model.StreamId;
import com.scylladb.cdc.model.TableName;
Expand All @@ -37,16 +38,26 @@
import com.scylladb.cdc.model.worker.RawChange;
import com.scylladb.cdc.model.worker.Task;

import javax.annotation.Nullable;

public final class Driver3WorkerCQL implements WorkerCQL {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();

private final Session session;
private final Map<TableName, PreparedStatement> preparedStmts = new HashMap<>();
private final ConsistencyLevel consistencyLevel;
@Nullable private final RateLimiter rateLimiter;

public Driver3WorkerCQL(Driver3Session session) {
this.session = Preconditions.checkNotNull(session).getDriverSession();
this.consistencyLevel = session.getConsistencyLevel();
this.rateLimiter = null;
}

public Driver3WorkerCQL(Driver3Session session, RateLimiter rateLimiter) {
this.session = Preconditions.checkNotNull(session).getDriverSession();
this.consistencyLevel = session.getConsistencyLevel();
this.rateLimiter = rateLimiter;
}

private static final class PreparedResult {
Expand All @@ -67,6 +78,9 @@ private static RegularStatement getStmt(TableName table) {
}

private CompletableFuture<PreparedResult> prepare(TableName table) {
if (rateLimiter != null) {
rateLimiter.acquire();
}
CompletableFuture<PreparedResult> result = new CompletableFuture<>();
Futures.addCallback(session.prepareAsync(getStmt(table)), new FutureCallback<PreparedStatement>() {

Expand Down Expand Up @@ -226,6 +240,9 @@ public CompletableFuture<Optional<RawChange>> nextChange() {
}

private CompletableFuture<Reader> query(PreparedStatement stmt, Task task) {
if (rateLimiter != null) {
rateLimiter.acquire();
}
CompletableFuture<Reader> result = new CompletableFuture<>();
List<ResultSetFuture> futures = task.streams.stream().map(StreamId::getValue)
.map(streamId ->
Expand Down
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