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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.attribute;

import io.undertow.server.HttpServerExchange;
import io.undertow.util.AttachmentKey;

import java.util.concurrent.TimeUnit;

/**
 * The response time
 *
 * This will only work if {@link io.undertow.UndertowOptions#RECORD_REQUEST_START_TIME} has been set
 */
public class ResponseTimeAttribute implements ExchangeAttribute {

    private static final AttachmentKey FIRST_RESPONSE_TIME_NANOS = AttachmentKey.create(Long.class);

    public static final String RESPONSE_TIME_MILLIS_SHORT = "%D";
    public static final String RESPONSE_TIME_SECONDS_SHORT = "%T";
    public static final String RESPONSE_TIME_MILLIS = "%{RESPONSE_TIME}";
    public static final String RESPONSE_TIME_MICROS = "%{RESPONSE_TIME_MICROS}";
    public static final String RESPONSE_TIME_NANOS = "%{RESPONSE_TIME_NANOS}";

    private final TimeUnit timeUnit;

    public ResponseTimeAttribute(TimeUnit timeUnit) {
        this.timeUnit = timeUnit;
    }

    @Override
    public String readAttribute(HttpServerExchange exchange) {
        long requestStartTime = exchange.getRequestStartTime();
        if(requestStartTime == -1) {
            return null;
        }
        final long nanos;
        Long first = exchange.getAttachment(FIRST_RESPONSE_TIME_NANOS);
        if(first != null) {
            nanos = first;
        } else {
            nanos = System.nanoTime() - requestStartTime;
            if(exchange.isResponseComplete()) {
                //save the response time so it is consistent
                exchange.putAttachment(FIRST_RESPONSE_TIME_NANOS, nanos);
            }
        }
        if(timeUnit == TimeUnit.SECONDS) {
            StringBuilder buf = new StringBuilder();
            long milis = TimeUnit.MILLISECONDS.convert(nanos, TimeUnit.NANOSECONDS);
            buf.append(Long.toString(milis / 1000));
            buf.append('.');
            int remains = (int) (milis % 1000);
            buf.append(Long.toString(remains / 100));
            remains = remains % 100;
            buf.append(Long.toString(remains / 10));
            buf.append(Long.toString(remains % 10));
            return buf.toString();
        } else {
            return String.valueOf(timeUnit.convert(nanos, TimeUnit.NANOSECONDS));
        }
    }

    @Override
    public void writeAttribute(HttpServerExchange exchange, String newValue) throws ReadOnlyAttributeException {
        throw new ReadOnlyAttributeException("Response Time", newValue);
    }

    @Override
    public String toString() {
        if (timeUnit.equals(TimeUnit.MILLISECONDS)) {
            return RESPONSE_TIME_MILLIS;
        }
        if (timeUnit.equals(TimeUnit.SECONDS)) {
            return RESPONSE_TIME_SECONDS_SHORT;
        }
        if(timeUnit.equals(TimeUnit.MICROSECONDS)) {
            return RESPONSE_TIME_MICROS;
        }
        if(timeUnit.equals(TimeUnit.NANOSECONDS)) {
            return RESPONSE_TIME_NANOS;
        }
        return "ResponseTimeAttribute";
    }

    public static final class Builder implements ExchangeAttributeBuilder {

        @Override
        public String name() {
            return "Response Time";
        }

        @Override
        public ExchangeAttribute build(String token) {
            if (token.equals(RESPONSE_TIME_MILLIS) || token.equals(RESPONSE_TIME_MILLIS_SHORT)) {
                return new ResponseTimeAttribute(TimeUnit.MILLISECONDS);
            }
            if (token.equals(RESPONSE_TIME_SECONDS_SHORT)) {
                return new ResponseTimeAttribute(TimeUnit.SECONDS);
            }
            if(token.equals(RESPONSE_TIME_MICROS)) {
                return new ResponseTimeAttribute(TimeUnit.MICROSECONDS);
            }
            if(token.equals(RESPONSE_TIME_NANOS)) {
                return new ResponseTimeAttribute(TimeUnit.NANOSECONDS);
            }
            return null;
        }

        @Override
        public int priority() {
            return 0;
        }
    }

}