/*
 * Copyright (c) 2014, 2017 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.http2;

import org.glassfish.grizzly.Buffer;
import org.glassfish.grizzly.http2.hpack.Encoder;
import org.glassfish.grizzly.memory.CompositeBuffer;
import org.glassfish.grizzly.memory.MemoryManager;

import java.util.Map;

Author:oleksiys
/** * * @author oleksiys */
public class HeadersEncoder { private static final String DEFAULT_BUFFER_SIZE_PROP_NAME = "org.glassfish.grizzly.http2.HeadersEncoder.DEFAULT_BUFFER_SIZE"; private static final String DEFAULT_BUFFER_SIZE_STRING = "8192"; private static final int DEFAULT_BUFFER_SIZE = Integer.parseInt(System.getProperty(DEFAULT_BUFFER_SIZE_PROP_NAME, DEFAULT_BUFFER_SIZE_STRING)); private final Encoder hpackEncoder; private final MemoryManager memoryManager; private CompositeBuffer buffer; public HeadersEncoder(final MemoryManager memoryManager, final int maxHeaderTableSize) { this.memoryManager = memoryManager; hpackEncoder = new Encoder(maxHeaderTableSize); } public void encodeHeader(final String name, final String value, final Map<String,String> capture) { if (capture != null) { capture.put(name, value); } init(); hpackEncoder.header(name, value); while (!hpackEncoder.encode(buffer)) { buffer.append(memoryManager.allocate(DEFAULT_BUFFER_SIZE)); } } public Buffer flushHeaders() { final Buffer bufferLocal = buffer; bufferLocal.trim(); buffer = null; return bufferLocal; } private void init() { if (buffer == null) { buffer = CompositeBuffer.newBuffer(memoryManager); buffer.allowInternalBuffersDispose(true); buffer.allowBufferDispose(true); buffer.append(memoryManager.allocate(DEFAULT_BUFFER_SIZE)); } } }