com.scurrilous.circe.impl.DirectByteBufferAccessLoader Maven / Gradle / Ivy
/*******************************************************************************
* Copyright 2014 Trevor Robinson
*
* Licensed 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.scurrilous.circe.impl;
import java.nio.ByteBuffer;
import java.util.Iterator;
import java.util.ServiceLoader;
/**
* Provides access to a singleton {@link DirectByteBufferAccess} implementation,
* if one is available.
*/
public final class DirectByteBufferAccessLoader {
private static final DirectByteBufferAccess INSTANCE;
static {
final Iterator iterator = ServiceLoader.load(
DirectByteBufferAccess.class).iterator();
INSTANCE = iterator.hasNext() ? iterator.next() : null;
}
/**
* Returns the native memory address of the given direct byte buffer, or 0
* if the buffer is not direct or if obtaining the address is not supported.
*
* @param buffer the direct byte buffer for which to obtain the address
* @return the native memory address or 0
*/
public static long getAddress(ByteBuffer buffer) {
return INSTANCE != null ? INSTANCE.getAddress(buffer) : 0;
}
private DirectByteBufferAccessLoader() {
}
}