org.apache.spark.network.util.ByteArrayReadableChannel Maven / Gradle / Ivy
/*
* 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.spark.network.util;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
import io.netty.buffer.ByteBuf;
public class ByteArrayReadableChannel implements ReadableByteChannel {
private ByteBuf data;
public int readableBytes() {
return data.readableBytes();
}
public void feedData(ByteBuf buf) {
data = buf;
}
@Override
public int read(ByteBuffer dst) throws IOException {
int totalRead = 0;
while (data.readableBytes() > 0 && dst.remaining() > 0) {
int bytesToRead = Math.min(data.readableBytes(), dst.remaining());
dst.put(data.readSlice(bytesToRead).nioBuffer());
totalRead += bytesToRead;
}
if (data.readableBytes() == 0) {
data.release();
}
return totalRead;
}
@Override
public void close() throws IOException {
}
@Override
public boolean isOpen() {
return true;
}
}