kafka RawTaggedFieldWriter 源码
kafka RawTaggedFieldWriter 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/protocol/types/RawTaggedFieldWriter.java
/*
* 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.kafka.common.protocol.types;
import org.apache.kafka.common.protocol.Writable;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
/**
* The RawTaggedFieldWriter is used by Message subclasses to serialize their
* lists of raw tags.
*/
public class RawTaggedFieldWriter {
private static final RawTaggedFieldWriter EMPTY_WRITER =
new RawTaggedFieldWriter(new ArrayList<>(0));
private final List<RawTaggedField> fields;
private final ListIterator<RawTaggedField> iter;
private int prevTag;
public static RawTaggedFieldWriter forFields(List<RawTaggedField> fields) {
if (fields == null) {
return EMPTY_WRITER;
}
return new RawTaggedFieldWriter(fields);
}
private RawTaggedFieldWriter(List<RawTaggedField> fields) {
this.fields = fields;
this.iter = this.fields.listIterator();
this.prevTag = -1;
}
public int numFields() {
return fields.size();
}
public void writeRawTags(Writable writable, int nextDefinedTag) {
while (iter.hasNext()) {
RawTaggedField field = iter.next();
int tag = field.tag();
if (tag >= nextDefinedTag) {
if (tag == nextDefinedTag) {
// We must not have a raw tag field that duplicates the tag of another field.
throw new RuntimeException("Attempted to use tag " + tag + " as an " +
"undefined tag.");
}
iter.previous();
return;
}
if (tag <= prevTag) {
// The raw tag field list must be sorted by tag, and there must not be
// any duplicate tags.
throw new RuntimeException("Invalid raw tag field list: tag " + tag +
" comes after tag " + prevTag + ", but is not higher than it.");
}
writable.writeUnsignedVarint(field.tag());
writable.writeUnsignedVarint(field.data().length);
writable.writeByteArray(field.data());
prevTag = tag;
}
}
}
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