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FlightInfo.java
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/
FlightInfo.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file 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,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.arrow.flight;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.util.List;
import java.util.stream.Collectors;
import org.apache.arrow.flight.impl.Flight;
import org.apache.arrow.vector.ipc.ReadChannel;
import org.apache.arrow.vector.ipc.WriteChannel;
import org.apache.arrow.vector.ipc.message.MessageSerializer;
import org.apache.arrow.vector.types.pojo.Schema;
import com.fasterxml.jackson.databind.util.ByteBufferBackedInputStream;
import com.google.common.collect.ImmutableList;
import com.google.protobuf.ByteString;
public class FlightInfo {
private Schema schema;
private FlightDescriptor descriptor;
private List<FlightEndpoint> endpoints;
private final long bytes;
private final long records;
public FlightInfo(Schema schema, FlightDescriptor descriptor, List<FlightEndpoint> endpoints, long bytes,
long records) {
super();
this.schema = schema;
this.descriptor = descriptor;
this.endpoints = endpoints;
this.bytes = bytes;
this.records = records;
}
FlightInfo(Flight.FlightInfo pbFlightInfo) {
try {
final ByteBuffer schemaBuf = pbFlightInfo.getSchema().asReadOnlyByteBuffer();
schema = pbFlightInfo.getSchema().size() > 0 ?
MessageSerializer.deserializeSchema(
new ReadChannel(Channels.newChannel(new ByteBufferBackedInputStream(schemaBuf))))
: new Schema(ImmutableList.of());
} catch (IOException e) {
throw new RuntimeException(e);
}
descriptor = new FlightDescriptor(pbFlightInfo.getFlightDescriptor());
endpoints = pbFlightInfo.getEndpointList().stream().map(t -> new FlightEndpoint(t)).collect(Collectors.toList());
bytes = pbFlightInfo.getTotalBytes();
records = pbFlightInfo.getTotalRecords();
}
public Schema getSchema() {
return schema;
}
public long getBytes() {
return bytes;
}
public long getRecords() {
return records;
}
public FlightDescriptor getDescriptor() {
return descriptor;
}
public List<FlightEndpoint> getEndpoints() {
return endpoints;
}
Flight.FlightInfo toProtocol() {
// Encode schema in a Message payload
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
MessageSerializer.serialize(new WriteChannel(Channels.newChannel(baos)), schema);
} catch (IOException e) {
throw new RuntimeException(e);
}
return Flight.FlightInfo.newBuilder()
.addAllEndpoint(endpoints.stream().map(t -> t.toProtocol()).collect(Collectors.toList()))
.setSchema(ByteString.copyFrom(baos.toByteArray()))
.setFlightDescriptor(descriptor.toProtocol())
.setTotalBytes(FlightInfo.this.bytes)
.setTotalRecords(records)
.build();
}
}