kafka Readable 源码
kafka Readable 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/protocol/Readable.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;
import org.apache.kafka.common.Uuid;
import org.apache.kafka.common.protocol.types.RawTaggedField;
import org.apache.kafka.common.record.MemoryRecords;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
public interface Readable {
byte readByte();
short readShort();
int readInt();
long readLong();
double readDouble();
byte[] readArray(int length);
int readUnsignedVarint();
ByteBuffer readByteBuffer(int length);
int readVarint();
long readVarlong();
int remaining();
default String readString(int length) {
byte[] arr = readArray(length);
return new String(arr, StandardCharsets.UTF_8);
}
default List<RawTaggedField> readUnknownTaggedField(List<RawTaggedField> unknowns, int tag, int size) {
if (unknowns == null) {
unknowns = new ArrayList<>();
}
byte[] data = readArray(size);
unknowns.add(new RawTaggedField(tag, data));
return unknowns;
}
default MemoryRecords readRecords(int length) {
if (length < 0) {
// no records
return null;
} else {
ByteBuffer recordsBuffer = readByteBuffer(length);
return MemoryRecords.readableRecords(recordsBuffer);
}
}
/**
* Read a UUID with the most significant digits first.
*/
default Uuid readUuid() {
return new Uuid(readLong(), readLong());
}
default int readUnsignedShort() {
return Short.toUnsignedInt(readShort());
}
default long readUnsignedInt() {
return Integer.toUnsignedLong(readInt());
}
}
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