io.netty.channel.unix.Buffer Maven / Gradle / Ivy
/*
* Copyright 2018 The Netty Project
*
* The Netty Project 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 io.netty.channel.unix;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.UnstableApi;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
@UnstableApi
public final class Buffer {
private Buffer() { }
/**
* Free the direct {@link ByteBuffer}.
*/
public static void free(ByteBuffer buffer) {
PlatformDependent.freeDirectBuffer(buffer);
}
/**
* Returns a new {@link ByteBuffer} which has the same {@link ByteOrder} as the native order of the machine.
*/
public static ByteBuffer allocateDirectWithNativeOrder(int capacity) {
return ByteBuffer.allocateDirect(capacity).order(
PlatformDependent.BIG_ENDIAN_NATIVE_ORDER ? ByteOrder.BIG_ENDIAN : ByteOrder.LITTLE_ENDIAN);
}
/**
* Returns the memory address of the given direct {@link ByteBuffer}.
*/
public static long memoryAddress(ByteBuffer buffer) {
assert buffer.isDirect();
if (PlatformDependent.hasUnsafe()) {
return PlatformDependent.directBufferAddress(buffer);
}
return memoryAddress0(buffer);
}
/**
* Returns the size of a pointer.
*/
public static int addressSize() {
if (PlatformDependent.hasUnsafe()) {
return PlatformDependent.addressSize();
}
return addressSize0();
}
// If Unsafe can not be used we will need to do JNI calls.
private static native int addressSize0();
private static native long memoryAddress0(ByteBuffer buffer);
}