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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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 io.undertow.server.handlers;

import io.undertow.server.ExchangeCompletionListener;
import io.undertow.server.HandlerWrapper;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;

import java.util.Date;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;

/**
 * Handler that records some metrics
 *
 * @author Stuart Douglas
 */
public class MetricsHandler implements HttpHandler {

    public static final HandlerWrapper WRAPPER = new HandlerWrapper() {
        @Override
        public HttpHandler wrap(HttpHandler handler) {
            return new MetricsHandler(handler);
        }
    };

    private volatile MetricResult totalResult = new MetricResult(new Date());
    private final HttpHandler next;

    public MetricsHandler(HttpHandler next) {
        this.next = next;
    }

    @Override
    public void handleRequest(HttpServerExchange exchange) throws Exception {
        if(!exchange.isComplete()) {
            final long start = System.currentTimeMillis();
            exchange.addExchangeCompleteListener(new ExchangeCompletionListener() {
                @Override
                public void exchangeEvent(HttpServerExchange exchange, NextListener nextListener) {
                    long time = System.currentTimeMillis() - start;
                    totalResult.update((int) time, exchange.getStatusCode());
                    nextListener.proceed();
                }
            });
        }
        next.handleRequest(exchange);
    }

    public void reset() {
        this.totalResult = new MetricResult(new Date());
    }

    public MetricResult getMetrics() {
        return new MetricResult(this.totalResult);
    }

    public static class MetricResult {

        private static final AtomicLongFieldUpdater totalRequestTimeUpdater = AtomicLongFieldUpdater.newUpdater(MetricResult.class, "totalRequestTime");
        private static final AtomicIntegerFieldUpdater maxRequestTimeUpdater = AtomicIntegerFieldUpdater.newUpdater(MetricResult.class, "maxRequestTime");
        private static final AtomicIntegerFieldUpdater minRequestTimeUpdater = AtomicIntegerFieldUpdater.newUpdater(MetricResult.class, "minRequestTime");
        private static final AtomicLongFieldUpdater invocationsUpdater = AtomicLongFieldUpdater.newUpdater(MetricResult.class, "totalRequests");
        private static final AtomicLongFieldUpdater errorsUpdater = AtomicLongFieldUpdater.newUpdater(MetricResult.class, "totalErrors");

        private final Date metricsStartDate;

        private volatile long totalRequestTime;
        private volatile int maxRequestTime;
        private volatile int minRequestTime = -1;
        private volatile long totalRequests;
        private volatile long totalErrors;

        public MetricResult(Date metricsStartDate) {
            this.metricsStartDate = metricsStartDate;
        }

        public MetricResult(MetricResult copy) {
            this.metricsStartDate = copy.metricsStartDate;
            this.totalRequestTime = copy.totalRequestTime;
            this.maxRequestTime = copy.maxRequestTime;
            this.minRequestTime = copy.minRequestTime;
            this.totalRequests = copy.totalRequests;
            this.totalErrors = copy.totalErrors;
        }

        void update(final int requestTime, int statusCode) {
            totalRequestTimeUpdater.addAndGet(this, requestTime);
            int maxRequestTime;
            do {
                maxRequestTime = this.maxRequestTime;
                if (requestTime < maxRequestTime) {
                    break;
                }
            } while (!maxRequestTimeUpdater.compareAndSet(this, maxRequestTime, requestTime));

            int minRequestTime;
            do {
                minRequestTime = this.minRequestTime;
                if (requestTime > minRequestTime && minRequestTime != -1) {
                    break;
                }
            } while (!minRequestTimeUpdater.compareAndSet(this, minRequestTime, requestTime));
            invocationsUpdater.incrementAndGet(this);
            if(statusCode >= 400) {
                errorsUpdater.incrementAndGet(this);
            }


        }

        public Date getMetricsStartDate() {
            return metricsStartDate;
        }

        public long getTotalRequestTime() {
            return totalRequestTime;
        }

        public int getMaxRequestTime() {
            return maxRequestTime;
        }

        public int getMinRequestTime() {
            return minRequestTime;
        }

        public long getTotalRequests() {
            return totalRequests;
        }

        public long getTotalErrors() {
            return totalErrors;
        }
    }
}