781a85520c
Motivation: Adding an example that showcases Netty’s HTTP/2 codec and that is slightly more complex than the existing hello-world example. It is based on the Gopher tiles example available here: https://http2.golang.org/gophertiles?latency=0 Modifications: Moved current http2 example to http2/helloworld. Added http2 tiles example under http2/tiles. Result: A Netty tiles example is available.
84 lines
2.7 KiB
Java
84 lines
2.7 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License, version 2.0 (the
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* "License"); you may not use this file except in compliance with the License. You may obtain a
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* copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*/
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package io.netty.example.http2;
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import static io.netty.util.internal.ObjectUtil.checkNotNull;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.Unpooled;
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import io.netty.handler.codec.http.QueryStringDecoder;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.List;
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/**
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* Utility methods used by the example client and server.
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*/
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public final class Http2ExampleUtil {
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/**
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* Response header sent in response to the http->http2 cleartext upgrade request.
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*/
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public static final String UPGRADE_RESPONSE_HEADER = "Http-To-Http2-Upgrade";
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/**
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* Size of the block to be read from the input stream.
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*/
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private static final int BLOCK_SIZE = 1024;
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private Http2ExampleUtil() { }
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/**
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* @param string the string to be converted to an integer.
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* @param defaultValue the default value
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* @return the integer value of a string or the default value, if the string is either null or empty.
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*/
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public static int toInt(String string, int defaultValue) {
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if (string != null && !string.isEmpty()) {
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return Integer.valueOf(string);
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}
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return defaultValue;
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}
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/**
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* Reads an InputStream into a byte array.
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* @param input the InputStream.
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* @return a byte array representation of the InputStream.
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* @throws IOException if an I/O exception of some sort happens while reading the InputStream.
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*/
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public static ByteBuf toByteBuf(InputStream input) throws IOException {
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ByteBuf buf = Unpooled.buffer();
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int n = 0;
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do {
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n = buf.writeBytes(input, BLOCK_SIZE);
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} while (n > 0);
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return buf;
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}
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/**
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* @param query the decoder of query string
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* @param key the key to lookup
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* @return the first occurrence of that key in the string parameters
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*/
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public static String firstValue(QueryStringDecoder query, String key) {
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checkNotNull(query, "Query can't be null!");
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List<String> values = query.parameters().get(key);
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if (values == null || values.isEmpty()) {
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return null;
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}
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return values.get(0);
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}
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}
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