/*
* Copyright (c) 2016 Network New Technologies Inc.
*
* Licensed 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 com.networknt.limit;
import com.networknt.config.Config;
import com.networknt.handler.MiddlewareHandler;
import com.networknt.utility.ModuleRegistry;
import io.undertow.Handlers;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.handlers.RequestLimit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
A handler which limits the maximum number of concurrent requests. Requests beyond the limit will
* be blocked until the previous request is complete.
*
* Created by steve on 05/11/16.
*/
public class LimitHandler implements MiddlewareHandler {
private static final String CONFIG_NAME = "limit";
public static LimitConfig config =
(LimitConfig)Config.getInstance().getJsonObjectConfig(CONFIG_NAME, LimitConfig.class);
private volatile HttpHandler next;
private final RequestLimit requestLimit;
public LimitHandler() {
this.requestLimit = new RequestLimit(config.concurrentRequest, config.queueSize);
}
@Override
public void handleRequest(final HttpServerExchange exchange) throws Exception {
requestLimit.handleRequest(exchange, this.next);
}
@Override
public HttpHandler getNext() {
return next;
}
@Override
public MiddlewareHandler setNext(final HttpHandler next) {
Handlers.handlerNotNull(next);
this.next = next;
return this;
}
@Override
public boolean isEnabled() {
return config.isEnabled();
}
@Override
public void register() {
ModuleRegistry.registerModule(LimitHandler.class.getName(), Config.getInstance().getJsonMapConfigNoCache(CONFIG_NAME), null);
}
}