package com.datastax.oss.driver.internal.core.loadbalancing.helper;
import com.datastax.oss.driver.api.core.config.DefaultDriverOption;
import com.datastax.oss.driver.api.core.config.DriverExecutionProfile;
import com.datastax.oss.driver.api.core.metadata.Node;
import com.datastax.oss.driver.internal.core.context.InternalDriverContext;
import com.datastax.oss.driver.internal.core.metadata.DefaultNode;
import edu.umd.cs.findbugs.annotations.NonNull;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.UUID;
import net.jcip.annotations.ThreadSafe;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ThreadSafe
public class MandatoryLocalDcHelper extends OptionalLocalDcHelper {
private static final Logger LOG = LoggerFactory.getLogger(MandatoryLocalDcHelper.class);
public MandatoryLocalDcHelper(
@NonNull InternalDriverContext context,
@NonNull DriverExecutionProfile profile,
@NonNull String logPrefix) {
super(context, profile, logPrefix);
}
@NonNull
@Override
public Optional<String> discoverLocalDc(@NonNull Map<UUID, Node> nodes) {
Optional<String> optionalLocalDc = super.discoverLocalDc(nodes);
if (optionalLocalDc.isPresent()) {
return optionalLocalDc;
}
Set<DefaultNode> contactPoints = context.getMetadataManager().getContactPoints();
if (context.getMetadataManager().wasImplicitContactPoint()) {
assert contactPoints.size() == 1;
Node contactPoint = contactPoints.iterator().next();
String localDc = contactPoint.getDatacenter();
if (localDc != null) {
LOG.debug(
"[{}] Local DC set from implicit contact point {}: {}",
logPrefix,
contactPoint,
localDc);
return Optional.of(localDc);
} else {
throw new IllegalStateException(
"The local DC could not be inferred from implicit contact point, please set it explicitly (see "
+ DefaultDriverOption.LOAD_BALANCING_LOCAL_DATACENTER.getPath()
+ " in the config, or set it programmatically with SessionBuilder.withLocalDatacenter)");
}
} else {
throw new IllegalStateException(
"Since you provided explicit contact points, the local DC must be explicitly set (see "
+ DefaultDriverOption.LOAD_BALANCING_LOCAL_DATACENTER.getPath()
+ " in the config, or set it programmatically with SessionBuilder.withLocalDatacenter). "
+ "Current contact points are: "
+ formatNodesAndDcs(contactPoints)
+ ". Current DCs in this cluster are: "
+ formatDcs(nodes.values()));
}
}
}