org.apache.flink.runtime.rest.handler.legacy.ConstantTextHandler Maven / Gradle / Ivy
/*
* 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.flink.runtime.rest.handler.legacy;
import org.apache.flink.configuration.ConfigConstants;
import org.apache.flink.runtime.rest.handler.router.RoutedRequest;
import org.apache.flink.runtime.rest.handler.util.KeepAliveWrite;
import org.apache.flink.shaded.netty4.io.netty.buffer.Unpooled;
import org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler;
import org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext;
import org.apache.flink.shaded.netty4.io.netty.channel.SimpleChannelInboundHandler;
import org.apache.flink.shaded.netty4.io.netty.handler.codec.http.DefaultFullHttpResponse;
import org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpHeaders;
import org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpResponse;
import org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpResponseStatus;
import org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpVersion;
/**
* Responder that returns a constant String.
*/
@ChannelHandler.Sharable
public class ConstantTextHandler extends SimpleChannelInboundHandler {
private final byte[] encodedText;
public ConstantTextHandler(String text) {
this.encodedText = text.getBytes(ConfigConstants.DEFAULT_CHARSET);
}
@Override
protected void channelRead0(ChannelHandlerContext ctx, RoutedRequest routed) throws Exception {
HttpResponse response = new DefaultFullHttpResponse(
HttpVersion.HTTP_1_1, HttpResponseStatus.OK, Unpooled.wrappedBuffer(encodedText));
response.headers().set(HttpHeaders.Names.CONTENT_LENGTH, encodedText.length);
response.headers().set(HttpHeaders.Names.CONTENT_TYPE, "text/plain");
KeepAliveWrite.flush(ctx, routed.getRequest(), response);
}
}