com.scalar.database.storage.cassandra.InsertStatementHandler Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of scalardb Show documentation
Show all versions of scalardb Show documentation
A universal transaction manager that achieves database-agnostic transactions and distributed transactions that span multiple databases
package com.scalar.database.storage.cassandra;
import static com.datastax.driver.core.querybuilder.QueryBuilder.bindMarker;
import static com.datastax.driver.core.querybuilder.QueryBuilder.insertInto;
import com.datastax.driver.core.BoundStatement;
import com.datastax.driver.core.PreparedStatement;
import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.Session;
import com.datastax.driver.core.querybuilder.Insert;
import com.scalar.database.api.Operation;
import com.scalar.database.api.Put;
import javax.annotation.Nonnull;
import javax.annotation.concurrent.ThreadSafe;
/**
* A handler class for insert statement
*
* @author Hiroyuki Yamada
*/
@ThreadSafe
public class InsertStatementHandler extends MutateStatementHandler {
/**
* Constructs {@code InsertStatementHandler} with the specified {@code Session}
*
* @param session session to be used with this statement
*/
public InsertStatementHandler(Session session) {
super(session);
}
@Override
@Nonnull
protected PreparedStatement prepare(Operation operation) {
checkArgument(operation, Put.class);
Put put = (Put) operation;
Insert insert = prepare(put);
String query = insert.getQueryString();
return prepare(query);
}
@Override
@Nonnull
protected BoundStatement bind(PreparedStatement prepared, Operation operation) {
checkArgument(operation, Put.class);
BoundStatement bound = prepared.bind();
bound = bind(bound, (Put) operation);
return bound;
}
@Override
@Nonnull
protected ResultSet execute(BoundStatement bound, Operation operation) {
return session.execute(bound);
}
private Insert prepare(Put put) {
Insert insert = insertInto(put.forNamespace().get(), put.forTable().get());
put.getPartitionKey().forEach(v -> insert.value(v.getName(), bindMarker()));
put.getClusteringKey()
.ifPresent(
k -> {
k.forEach(v -> insert.value(v.getName(), bindMarker()));
});
put.getValues().forEach((k, v) -> insert.value(v.getName(), bindMarker()));
setCondition(insert, put);
return insert;
}
private BoundStatement bind(BoundStatement bound, Put put) {
ValueBinder binder = new ValueBinder(bound);
// bind in the prepared order
put.getPartitionKey().forEach(v -> v.accept(binder));
put.getClusteringKey().ifPresent(k -> k.forEach(v -> v.accept(binder)));
put.getValues().forEach((k, v) -> v.accept(binder));
// it calls for consistency, but actually nothing to bind here
bindCondition(binder, put);
return bound;
}
}