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* distributed with this work for additional information
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* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.datastax.dse.driver.internal.core.cql.continuous;
import com.datastax.dse.driver.api.core.config.DseDriverOption;
import com.datastax.dse.driver.api.core.cql.continuous.ContinuousAsyncResultSet;
import com.datastax.dse.driver.api.core.metrics.DseSessionMetric;
import com.datastax.dse.driver.internal.core.cql.DseConversions;
import com.datastax.dse.protocol.internal.response.result.DseRowsMetadata;
import com.datastax.oss.driver.api.core.config.DriverExecutionProfile;
import com.datastax.oss.driver.api.core.cql.ColumnDefinitions;
import com.datastax.oss.driver.api.core.cql.ExecutionInfo;
import com.datastax.oss.driver.api.core.cql.Row;
import com.datastax.oss.driver.api.core.cql.Statement;
import com.datastax.oss.driver.api.core.metrics.DefaultNodeMetric;
import com.datastax.oss.driver.api.core.metrics.DefaultSessionMetric;
import com.datastax.oss.driver.internal.core.context.InternalDriverContext;
import com.datastax.oss.driver.internal.core.cql.Conversions;
import com.datastax.oss.driver.internal.core.cql.DefaultRow;
import com.datastax.oss.driver.internal.core.session.DefaultSession;
import com.datastax.oss.driver.internal.core.util.CountingIterator;
import com.datastax.oss.protocol.internal.Message;
import com.datastax.oss.protocol.internal.response.result.Rows;
import edu.umd.cs.findbugs.annotations.NonNull;
import java.nio.ByteBuffer;
import java.time.Duration;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import net.jcip.annotations.ThreadSafe;
/**
* Handles a request that supports multiple response messages (a.k.a. continuous paging request).
*/
@ThreadSafe
public class ContinuousCqlRequestHandler
extends ContinuousRequestHandlerBase, ContinuousAsyncResultSet> {
ContinuousCqlRequestHandler(
@NonNull Statement statement,
@NonNull DefaultSession session,
@NonNull InternalDriverContext context,
@NonNull String sessionLogPrefix) {
super(
statement,
session,
context,
sessionLogPrefix,
ContinuousAsyncResultSet.class,
false,
DefaultSessionMetric.CQL_CLIENT_TIMEOUTS,
DseSessionMetric.CONTINUOUS_CQL_REQUESTS,
DefaultNodeMetric.CQL_MESSAGES);
// NOTE that ordering of the following statement matters.
// We should register this request after all fields have been initialized.
throttler.register(this);
}
@NonNull
@Override
protected Duration getGlobalTimeout() {
return Duration.ZERO;
}
@NonNull
@Override
protected Duration getPageTimeout(@NonNull Statement statement, int pageNumber) {
DriverExecutionProfile executionProfile =
Conversions.resolveExecutionProfile(statement, context);
if (pageNumber == 1) {
return executionProfile.getDuration(DseDriverOption.CONTINUOUS_PAGING_TIMEOUT_FIRST_PAGE);
} else {
return executionProfile.getDuration(DseDriverOption.CONTINUOUS_PAGING_TIMEOUT_OTHER_PAGES);
}
}
@NonNull
@Override
protected Duration getReviseRequestTimeout(@NonNull Statement statement) {
DriverExecutionProfile executionProfile =
Conversions.resolveExecutionProfile(statement, context);
return executionProfile.getDuration(DseDriverOption.CONTINUOUS_PAGING_TIMEOUT_OTHER_PAGES);
}
@Override
protected int getMaxEnqueuedPages(@NonNull Statement statement) {
DriverExecutionProfile executionProfile =
Conversions.resolveExecutionProfile(statement, context);
return executionProfile.getInt(DseDriverOption.CONTINUOUS_PAGING_MAX_ENQUEUED_PAGES);
}
@Override
protected int getMaxPages(@NonNull Statement statement) {
DriverExecutionProfile executionProfile =
Conversions.resolveExecutionProfile(statement, context);
return executionProfile.getInt(DseDriverOption.CONTINUOUS_PAGING_MAX_PAGES);
}
@NonNull
@Override
protected Message getMessage(@NonNull Statement statement) {
DriverExecutionProfile executionProfile =
Conversions.resolveExecutionProfile(statement, context);
return DseConversions.toContinuousPagingMessage(statement, executionProfile, context);
}
@Override
protected boolean isTracingEnabled(@NonNull Statement statement) {
return false;
}
@NonNull
@Override
protected Map createPayload(@NonNull Statement statement) {
return statement.getCustomPayload();
}
@NonNull
@Override
protected ContinuousAsyncResultSet createEmptyResultSet(@NonNull ExecutionInfo executionInfo) {
return DefaultContinuousAsyncResultSet.empty(executionInfo);
}
@NonNull
@Override
protected DefaultContinuousAsyncResultSet createResultSet(
@NonNull Statement statement,
@NonNull Rows rows,
@NonNull ExecutionInfo executionInfo,
@NonNull ColumnDefinitions columnDefinitions) {
Queue> data = rows.getData();
CountingIterator iterator =
new CountingIterator(data.size()) {
@Override
protected Row computeNext() {
List rowData = data.poll();
return (rowData == null)
? endOfData()
: new DefaultRow(columnDefinitions, rowData, context);
}
};
DseRowsMetadata metadata = (DseRowsMetadata) rows.getMetadata();
return new DefaultContinuousAsyncResultSet(
iterator,
columnDefinitions,
metadata.continuousPageNumber,
!metadata.isLastContinuousPage,
executionInfo,
this);
}
@Override
protected int pageNumber(@NonNull ContinuousAsyncResultSet resultSet) {
return resultSet.pageNumber();
}
}