| // |
| // ======================================================================== |
| // Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| |
| package org.eclipse.jetty.http; |
| |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.ServiceLoader; |
| |
| import org.eclipse.jetty.util.log.Log; |
| import org.eclipse.jetty.util.log.Logger; |
| |
| |
| /* ------------------------------------------------------------ */ |
| /** Pre encoded HttpField. |
| * <p>A HttpField that will be cached and used many times can be created as |
| * a {@link PreEncodedHttpField}, which will use the {@link HttpFieldPreEncoder} |
| * instances discovered by the {@link ServiceLoader} to pre-encode the header |
| * for each version of HTTP in use. This will save garbage |
| * and CPU each time the field is encoded into a response. |
| * </p> |
| */ |
| public class PreEncodedHttpField extends HttpField |
| { |
| private final static Logger LOG = Log.getLogger(PreEncodedHttpField.class); |
| private final static HttpFieldPreEncoder[] __encoders; |
| |
| static |
| { |
| List<HttpFieldPreEncoder> encoders = new ArrayList<>(); |
| Iterator<HttpFieldPreEncoder> iter = ServiceLoader.load(HttpFieldPreEncoder.class,PreEncodedHttpField.class.getClassLoader()).iterator(); |
| while (iter.hasNext()) |
| { |
| try |
| { |
| HttpFieldPreEncoder encoder = iter.next(); |
| if (index(encoder.getHttpVersion())>=0) |
| encoders.add(encoder); |
| } |
| catch(Error|RuntimeException e) |
| { |
| LOG.debug(e); |
| } |
| } |
| LOG.debug("HttpField encoders loaded: {}",encoders); |
| int size=encoders.size(); |
| |
| __encoders = new HttpFieldPreEncoder[size==0?1:size]; |
| for (HttpFieldPreEncoder e:encoders) |
| { |
| int i = index(e.getHttpVersion()); |
| if (__encoders[i]==null) |
| __encoders[i] = e; |
| else |
| LOG.warn("multiple PreEncoders for "+e.getHttpVersion()); |
| } |
| |
| // Always support HTTP1 |
| if (__encoders[0]==null) |
| __encoders[0] = new Http1FieldPreEncoder(); |
| } |
| |
| private static int index(HttpVersion version) |
| { |
| switch (version) |
| { |
| case HTTP_1_0: |
| case HTTP_1_1: |
| return 0; |
| |
| case HTTP_2: |
| return 1; |
| |
| default: |
| return -1; |
| } |
| } |
| |
| private final byte[][] _encodedField=new byte[__encoders.length][]; |
| |
| public PreEncodedHttpField(HttpHeader header,String name,String value) |
| { |
| super(header,name, value); |
| for (int i=0;i<__encoders.length;i++) |
| _encodedField[i]=__encoders[i].getEncodedField(header,header.asString(),value); |
| } |
| |
| public PreEncodedHttpField(HttpHeader header,String value) |
| { |
| this(header,header.asString(),value); |
| } |
| |
| public PreEncodedHttpField(String name,String value) |
| { |
| this(null,name,value); |
| } |
| |
| public void putTo(ByteBuffer bufferInFillMode, HttpVersion version) |
| { |
| bufferInFillMode.put(_encodedField[index(version)]); |
| } |
| } |