/*
* 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.nifi.provenance;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Optional;
import org.apache.nifi.provenance.schema.EventIdFirstHeaderSchema;
import org.apache.nifi.provenance.schema.LookupTableEventRecord;
import org.apache.nifi.provenance.serialization.CompressableRecordReader;
import org.apache.nifi.provenance.toc.TocReader;
import org.apache.nifi.repository.schema.Record;
import org.apache.nifi.repository.schema.RecordSchema;
import org.apache.nifi.repository.schema.SchemaRecordReader;
import org.apache.nifi.stream.io.LimitingInputStream;
import org.apache.nifi.stream.io.StreamUtils;
public class EventIdFirstSchemaRecordReader extends CompressableRecordReader {
RecordSchema getSchema() {
return schema;
}
SchemaRecordReader getRecordReader() {
return recordReader;
}
private RecordSchema schema; // effectively final
private SchemaRecordReader recordReader; // effectively final
private List<String> componentIds;
private List<String> componentTypes;
private List<String> queueIds;
private List<String> eventTypes;
private long firstEventId;
List<String> getComponentIds() {
return componentIds;
}
List<String> getComponentTypes() {
return componentTypes;
}
List<String> getQueueIds() {
return queueIds;
}
List<String> getEventTypes() {
return eventTypes;
}
long getFirstEventId() {
return firstEventId;
}
long getSystemTimeOffset() {
return systemTimeOffset;
}
private long systemTimeOffset;
public EventIdFirstSchemaRecordReader(final InputStream in, final String filename, final TocReader tocReader, final int maxAttributeChars) throws IOException {
super(in, filename, tocReader, maxAttributeChars);
}
protected void verifySerializationVersion(final int serializationVersion) {
if (serializationVersion > EventIdFirstSchemaRecordWriter.SERIALIZATION_VERSION) {
throw new IllegalArgumentException("Unable to deserialize record because the version is " + serializationVersion
+ " and supported versions are 1-" + EventIdFirstSchemaRecordWriter.SERIALIZATION_VERSION);
}
}
@Override
@SuppressWarnings("unchecked")
protected synchronized void readHeader(final DataInputStream in, final int serializationVersion) throws IOException {
verifySerializationVersion(serializationVersion);
final int eventSchemaLength = in.readInt();
final byte[] buffer = new byte[eventSchemaLength];
StreamUtils.fillBuffer(in, buffer);
try (final ByteArrayInputStream bais = new ByteArrayInputStream(buffer)) {
schema = RecordSchema.readFrom(bais);
}
recordReader = SchemaRecordReader.fromSchema(schema);
final int headerSchemaLength = in.readInt();
final byte[] headerSchemaBuffer = new byte[headerSchemaLength];
StreamUtils.fillBuffer(in, headerSchemaBuffer);
final RecordSchema headerSchema;
try (final ByteArrayInputStream bais = new ByteArrayInputStream(headerSchemaBuffer)) {
headerSchema = RecordSchema.readFrom(bais);
}
final SchemaRecordReader headerReader = SchemaRecordReader.fromSchema(headerSchema);
final Record headerRecord = headerReader.readRecord(in);
componentIds = (List<String>) headerRecord.getFieldValue(EventIdFirstHeaderSchema.FieldNames.COMPONENT_IDS);
componentTypes = (List<String>) headerRecord.getFieldValue(EventIdFirstHeaderSchema.FieldNames.COMPONENT_TYPES);
queueIds = (List<String>) headerRecord.getFieldValue(EventIdFirstHeaderSchema.FieldNames.QUEUE_IDS);
eventTypes = (List<String>) headerRecord.getFieldValue(EventIdFirstHeaderSchema.FieldNames.EVENT_TYPES);
firstEventId = (Long) headerRecord.getFieldValue(EventIdFirstHeaderSchema.FieldNames.FIRST_EVENT_ID);
systemTimeOffset = (Long) headerRecord.getFieldValue(EventIdFirstHeaderSchema.FieldNames.TIMESTAMP_OFFSET);
}
@Override
protected StandardProvenanceEventRecord nextRecord(final DataInputStream in, final int serializationVersion) throws IOException {
verifySerializationVersion(serializationVersion);
final long byteOffset = getBytesConsumed();
final long eventId = in.readInt() + firstEventId;
final int recordLength = in.readInt();
return readRecord(in, eventId, byteOffset, recordLength);
}
private StandardProvenanceEventRecord readRecord(final DataInputStream in, final long eventId, final long startOffset, final int recordLength) throws IOException {
final InputStream limitedIn = new LimitingInputStream(in, recordLength);
final Record eventRecord = recordReader.readRecord(limitedIn);
if (eventRecord == null) {
return null;
}
final StandardProvenanceEventRecord deserializedEvent = LookupTableEventRecord.getEvent(eventRecord, getFilename(), startOffset, getMaxAttributeLength(),
firstEventId, systemTimeOffset, componentIds, componentTypes, queueIds, eventTypes);
deserializedEvent.setEventId(eventId);
return deserializedEvent;
}
protected boolean isData(final InputStream in) throws IOException {
in.mark(1);
final int nextByte = in.read();
in.reset();
return nextByte > -1;
}
@Override
protected Optional<StandardProvenanceEventRecord> readToEvent(final long eventId, final DataInputStream dis, final int serializationVersion) throws IOException {
verifySerializationVersion(serializationVersion);
while (isData(dis)) {
final long startOffset = getBytesConsumed();
final long id = dis.readInt() + firstEventId;
final int recordLength = dis.readInt();
if (id >= eventId) {
final StandardProvenanceEventRecord event = readRecord(dis, id, startOffset, recordLength);
return Optional.ofNullable(event);
} else {
// This is not the record we want. Skip over it instead of deserializing it.
StreamUtils.skip(dis, recordLength);
}
}
return Optional.empty();
}
@Override
public String toString() {
return getDescription();
}
private String getDescription() {
try {
return "EventIdFirstSchemaRecordReader, toc: " + getTocReader().getFile().getAbsolutePath() + ", journal: " + getFilename();
} catch (Exception e) {
return "EventIdFirstSchemaRecordReader@" + Integer.toHexString(this.hashCode());
}
}
}