| /* |
| * 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.ignite.internal.processors.odbc; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| import org.apache.ignite.IgniteCheckedException; |
| import org.apache.ignite.internal.util.nio.GridNioParser; |
| import org.apache.ignite.internal.util.nio.GridNioSession; |
| import org.apache.ignite.internal.util.nio.GridNioSessionMetaKey; |
| |
| /** |
| * This class implements stream parser based on {@link ClientListenerNioServerBuffer}. |
| * <p> |
| * The rule for this parser is that every message sent over the stream is prepended with |
| * 4-byte integer header containing message size. So, the stream structure is as follows: |
| * <pre> |
| * +--+--+--+--+--+--+...+--+--+--+--+--+--+--+...+--+ |
| * | MSG_SIZE | MESSAGE | MSG_SIZE | MESSAGE | |
| * +--+--+--+--+--+--+...+--+--+--+--+--+--+--+...+--+ |
| * </pre> |
| */ |
| public class ClientListenerBufferedParser implements GridNioParser { |
| /** Buffer metadata key. */ |
| private static final int BUF_META_KEY = GridNioSessionMetaKey.nextUniqueKey(); |
| |
| /** {@inheritDoc} */ |
| @Override public byte[] decode(GridNioSession ses, ByteBuffer buf) throws IOException, IgniteCheckedException { |
| ClientListenerNioServerBuffer nioBuf = ses.meta(BUF_META_KEY); |
| |
| // Decode for a given session is called per one thread, so there should not be any concurrency issues. |
| // However, we make some additional checks. |
| if (nioBuf == null) { |
| nioBuf = new ClientListenerNioServerBuffer(); |
| |
| ClientListenerNioServerBuffer old = ses.addMeta(BUF_META_KEY, nioBuf); |
| |
| assert old == null; |
| } |
| |
| return nioBuf.read(buf); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public ByteBuffer encode(GridNioSession ses, Object msg) throws IOException, IgniteCheckedException { |
| byte[] msg0 = (byte[])msg; |
| |
| ByteBuffer res = ByteBuffer.allocate(msg0.length + 4); |
| |
| res.order(ByteOrder.LITTLE_ENDIAN); |
| |
| res.putInt(msg0.length); |
| res.put(msg0); |
| |
| res.flip(); |
| |
| return res; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public String toString() { |
| return ClientListenerBufferedParser.class.getSimpleName(); |
| } |
| } |