/*
 * Copyright (c) 2010, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.grizzly.streams;

import java.io.IOException;

import org.glassfish.grizzly.Buffer;
import org.glassfish.grizzly.CompletionHandler;
import org.glassfish.grizzly.Connection;
import org.glassfish.grizzly.Grizzly;
import org.glassfish.grizzly.GrizzlyFuture;
import org.glassfish.grizzly.TransformationResult;
import org.glassfish.grizzly.TransformationResult.Status;
import org.glassfish.grizzly.Transformer;
import org.glassfish.grizzly.attributes.Attribute;
import org.glassfish.grizzly.attributes.AttributeStorage;
import org.glassfish.grizzly.impl.ReadyFutureImpl;
import org.glassfish.grizzly.memory.CompositeBuffer;
import org.glassfish.grizzly.memory.MemoryManager;

Author:Alexey Stashok
/** * * @author Alexey Stashok */
@SuppressWarnings("unchecked") public class TransformerOutput extends BufferedOutput { private final Attribute<CompositeBuffer> outputBufferAttr; protected final Transformer<Buffer, Buffer> transformer; protected final Output underlyingOutput; protected final MemoryManager memoryManager; protected final AttributeStorage attributeStorage; public TransformerOutput(Transformer<Buffer, Buffer> transformer, Output underlyingOutput, Connection connection) { this(transformer, underlyingOutput, connection.getMemoryManager(), connection); } public TransformerOutput(Transformer<Buffer, Buffer> transformer, Output underlyingOutput, MemoryManager memoryManager, AttributeStorage attributeStorage) { this.transformer = transformer; this.underlyingOutput = underlyingOutput; this.memoryManager = memoryManager; this.attributeStorage = attributeStorage; outputBufferAttr = Grizzly.DEFAULT_ATTRIBUTE_BUILDER.createAttribute("TransformerOutput-" + transformer.getName()); } @Override protected GrizzlyFuture<Integer> flush0(Buffer buffer, final CompletionHandler<Integer> completionHandler) throws IOException { if (buffer != null) { CompositeBuffer savedBuffer = outputBufferAttr.get(attributeStorage); if (savedBuffer != null) { savedBuffer.append(buffer); buffer = savedBuffer; } do { final TransformationResult<Buffer, Buffer> result = transformer.transform(attributeStorage, buffer); final Status status = result.getStatus(); if (status == Status.COMPLETE) { final Buffer outputBuffer = result.getMessage(); underlyingOutput.write(outputBuffer); transformer.release(attributeStorage); } else if (status == Status.INCOMPLETE) { buffer.compact(); if (!buffer.isComposite()) { buffer = CompositeBuffer.newBuffer(memoryManager, buffer); } outputBufferAttr.set(attributeStorage, (CompositeBuffer) buffer); return ReadyFutureImpl.create(new IllegalStateException("Can not flush data: " + "Insufficient input data for transformer")); } else if (status == Status.ERROR) { transformer.release(attributeStorage); throw new IOException("Transformation exception: " + result.getErrorDescription()); } } while (buffer.hasRemaining()); return underlyingOutput.flush(completionHandler); } return ZERO_READY_FUTURE; } @Override protected Buffer newBuffer(int size) { return memoryManager.allocate(size); } @Override protected Buffer reallocateBuffer(Buffer oldBuffer, int size) { return memoryManager.reallocate(oldBuffer, size); } @Override protected void onClosed() throws IOException { } }