| // 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.impala.util; |
| |
| import org.apache.thrift.TConfiguration; |
| import org.apache.thrift.transport.TEndpointTransport; |
| import org.apache.thrift.transport.TTransportException; |
| |
| import java.nio.BufferOverflowException; |
| import java.nio.BufferUnderflowException; |
| import java.nio.ByteBuffer; |
| |
| /** |
| * ByteBuffer-backed implementation of TTransport. |
| * <p> |
| * This is a copy of org.apache.thrift.transport.TByteBuffer that is patched with |
| * THRIFT-5696. Once Impala upgrade its IMPALA_THRIFT_POM_VERSION to thrift-0.19.0, this |
| * class can be replaced with the patched TByteBuffer from thrift java library. |
| */ |
| public final class TByteBuffer extends TEndpointTransport { |
| private final ByteBuffer byteBuffer; |
| |
| /** |
| * Creates a new TByteBuffer wrapping a given NIO ByteBuffer and custom TConfiguration. |
| * |
| * @param configuration the custom TConfiguration. |
| * @param byteBuffer the NIO ByteBuffer to wrap. |
| * @throws TTransportException on error. |
| */ |
| public TByteBuffer(TConfiguration configuration, ByteBuffer byteBuffer) |
| throws TTransportException { |
| super(configuration); |
| this.byteBuffer = byteBuffer; |
| updateKnownMessageSize(byteBuffer.capacity()); |
| } |
| |
| /** |
| * Creates a new TByteBuffer wrapping a given NIO ByteBuffer. |
| * |
| * @param byteBuffer the NIO ByteBuffer to wrap. |
| * @throws TTransportException on error. |
| */ |
| public TByteBuffer(ByteBuffer byteBuffer) throws TTransportException { |
| this(new TConfiguration(), byteBuffer); |
| } |
| |
| @Override |
| public boolean isOpen() { |
| return true; |
| } |
| |
| @Override |
| public void open() { |
| } |
| |
| @Override |
| public void close() { |
| } |
| |
| @Override |
| public int read(byte[] buf, int off, int len) throws TTransportException { |
| // |
| checkReadBytesAvailable(len); |
| |
| final int n = Math.min(byteBuffer.remaining(), len); |
| if (n > 0) { |
| try { |
| byteBuffer.get(buf, off, n); |
| } catch (BufferUnderflowException e) { |
| throw new TTransportException("Unexpected end of input buffer", e); |
| } |
| } |
| return n; |
| } |
| |
| @Override |
| public void write(byte[] buf, int off, int len) throws TTransportException { |
| try { |
| byteBuffer.put(buf, off, len); |
| } catch (BufferOverflowException e) { |
| throw new TTransportException("Not enough room in output buffer", e); |
| } |
| } |
| |
| /** |
| * Gets the underlying NIO ByteBuffer. |
| * |
| * @return the underlying NIO ByteBuffer. |
| */ |
| public ByteBuffer getByteBuffer() { |
| return byteBuffer; |
| } |
| |
| /** |
| * Convenience method to call clear() on the underlying NIO ByteBuffer. |
| * |
| * @return this instance. |
| */ |
| public TByteBuffer clear() { |
| byteBuffer.clear(); |
| return this; |
| } |
| |
| /** |
| * Convenience method to call flip() on the underlying NIO ByteBuffer. |
| * |
| * @return this instance. |
| */ |
| public TByteBuffer flip() { |
| byteBuffer.flip(); |
| return this; |
| } |
| |
| /** |
| * Convenience method to convert the underlying NIO ByteBuffer to a plain old byte |
| * array. |
| * |
| * @return the byte array backing the underlying NIO ByteBuffer. |
| */ |
| public byte[] toByteArray() { |
| final byte[] data = new byte[byteBuffer.remaining()]; |
| byteBuffer.slice().get(data); |
| return data; |
| } |
| } |