| /* |
| * 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.geode.internal.net; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.SocketChannel; |
| |
| /** |
| * Prior to transmitting a buffer or processing a received buffer a NioFilter should be called to |
| * wrap (transmit) or unwrap (received) the buffer in case SSL is being used.<br> |
| * Implementations of |
| * this class may not be thread-safe in regard to the buffers their methods return. These may be |
| * internal state that, if used concurrently by multiple threads could cause corruption. Appropriate |
| * external synchronization must be used in order to provide thread-safety. Do this by invoking |
| * getSynchObject() and synchronizing on the returned object while using the buffer. |
| */ |
| public interface NioFilter { |
| |
| /** |
| * wrap bytes for transmission to another process |
| * |
| * Be sure to call close() on the returned {@link ByteBufferSharing}. The best way to do that is |
| * to call this method in a try-with-resources statement. |
| */ |
| ByteBufferSharing wrap(ByteBuffer buffer) throws IOException; |
| |
| /** |
| * unwrap bytes received from another process. The unwrapped buffer should be flipped before |
| * reading. When done reading invoke doneReading() to reset for future read ops |
| * |
| * Be sure to call close() on the returned {@link ByteBufferSharing}. The best way to do that is |
| * to call this method in a try-with-resources statement. |
| */ |
| ByteBufferSharing unwrap(ByteBuffer wrappedBuffer) throws IOException; |
| |
| /** |
| * ensure that the wrapped buffer has enough room to read the given amount of data. This must be |
| * invoked before readAtLeast. A new buffer may be returned by this method. |
| */ |
| ByteBuffer ensureWrappedCapacity(int amount, ByteBuffer wrappedBuffer, |
| BufferPool.BufferType bufferType); |
| |
| /** |
| * read at least the indicated amount of bytes from the given socket. The buffer position will be |
| * ready for reading the data when this method returns. Note: you must invoke |
| * ensureWrappedCapacity with the given amount prior to each invocation of this method. |
| * <br> |
| * wrappedBuffer = filter.ensureWrappedCapacity(amount, wrappedBuffer, etc.);<br> |
| * unwrappedBuffer |
| * = filter.readAtLeast(channel, amount, wrappedBuffer, etc.) |
| * |
| * Be sure to call close() on the returned {@link ByteBufferSharing}. The best way to do that is |
| * to call this method in a try-with-resources statement. |
| */ |
| ByteBufferSharing readAtLeast(SocketChannel channel, int amount, ByteBuffer wrappedBuffer) |
| throws IOException; |
| |
| /** |
| * When done reading a direct ack message invoke this method |
| */ |
| default void doneReadingDirectAck(ByteBuffer unwrappedBuffer) { |
| doneReading(unwrappedBuffer); |
| } |
| |
| /** |
| * You must invoke this when done reading from the unwrapped buffer |
| */ |
| default void doneReading(ByteBuffer unwrappedBuffer) { |
| if (unwrappedBuffer.position() != 0) { |
| unwrappedBuffer.compact(); |
| } else { |
| unwrappedBuffer.position(unwrappedBuffer.limit()); |
| unwrappedBuffer.limit(unwrappedBuffer.capacity()); |
| } |
| } |
| |
| /** |
| * invoke this method when you are done using the NioFilter |
| */ |
| default void close(SocketChannel socketChannel) { |
| // nothing by default |
| } |
| |
| /** |
| * Returns the sharing object for the {@link NioFilter}'s unwrapped buffer, if one exists. |
| * |
| * Be sure to call close() on the returned {@link ByteBufferSharing}. The best way to do that is |
| * to call this method in a try-with-resources statement. |
| */ |
| ByteBufferSharing getUnwrappedBuffer() throws IOException; |
| |
| } |