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optimize: support jdk9+ compile code (sofastack#772)
* optimize: support jdk9+ compile code
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97
jraft-core/src/main/java/com/alipay/sofa/jraft/util/BufferUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| /* | ||
| * 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 com.alipay.sofa.jraft.util; | ||
|
|
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| import java.nio.Buffer; | ||
|
|
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| /** | ||
| * Explicit cast to {@link Buffer} parent buffer type. It resolves issues with covariant return types in Java 9+ for | ||
| * {@link java.nio.ByteBuffer} and {@link java.nio.CharBuffer}. Explicit casting resolves the NoSuchMethodErrors (e.g | ||
| * java.lang.NoSuchMethodError: java.nio.ByteBuffer.flip(I)Ljava/nio/ByteBuffer) when the project is compiled with | ||
| * newer Java version and run on Java 8. | ||
| * <p/> | ||
| * <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html">Java 8</a> doesn't provide override the | ||
| * following Buffer methods in subclasses: | ||
| * | ||
| * <pre> | ||
| * Buffer clear() | ||
| * Buffer flip() | ||
| * Buffer limit(int newLimit) | ||
| * Buffer mark() | ||
| * Buffer position(int newPosition) | ||
| * Buffer reset() | ||
| * Buffer rewind() | ||
| * </pre> | ||
| * | ||
| * <a href="https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html">Java 9</a> introduces the overrides in | ||
| * child classes (e.g the ByteBuffer), but the return type is the specialized one and not the abstract {@link Buffer}. | ||
| * So the code compiled with newer Java is not working on Java 8 unless a workaround with explicit casting is used. | ||
| * | ||
| * @author funkye | ||
| */ | ||
| public class BufferUtils { | ||
|
|
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| /** | ||
| * @param buffer byteBuffer | ||
| */ | ||
| public static void flip(Buffer buffer) { | ||
| buffer.flip(); | ||
| } | ||
|
|
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| /** | ||
| * @param buffer byteBuffer | ||
| */ | ||
| public static void clear(Buffer buffer) { | ||
| buffer.clear(); | ||
| } | ||
|
|
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| /** | ||
| * @param buffer byteBuffer | ||
| */ | ||
| public static void limit(Buffer buffer, int newLimit) { | ||
| buffer.limit(newLimit); | ||
| } | ||
|
|
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| /** | ||
| * @param buffer byteBuffer | ||
| */ | ||
| public static void mark(Buffer buffer) { | ||
| buffer.mark(); | ||
| } | ||
|
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| /** | ||
| * @param buffer byteBuffer | ||
| */ | ||
| public static void position(Buffer buffer, int newPosition) { | ||
| buffer.position(newPosition); | ||
| } | ||
|
|
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| /** | ||
| * @param buffer byteBuffer | ||
| */ | ||
| public static void rewind(Buffer buffer) { | ||
| buffer.rewind(); | ||
| } | ||
|
|
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| /** | ||
| * @param buffer byteBuffer | ||
| */ | ||
| public static void reset(Buffer buffer) { | ||
| buffer.reset(); | ||
| } | ||
|
|
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| } |
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