view flys-backend/src/main/java/de/intevation/flys/model/FastCrossSectionLine.java @ 5779:ebec12def170

Datacage: Add a pool of builders to make it multi threadable. XML DOM is not thread safe. Therefore the old implementation only allowed one thread to use the builder at a time. As the complexity of the configuration has increased over time this has become a bottleneck of the whole application because it took quiet some time to build a result. Furthermore the builder code path is visited very frequent. So many concurrent requests were piled up resulting in long waits for the users. To mitigate this problem a round robin pool of builders is used now. Each of the pooled builders has an independent copy of the XML template and can be run in parallel. The number of builders is determined by the system property 'flys.datacage.pool.size'. It defaults to 4.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 21 Apr 2013 12:48:09 +0200
parents 2f874d14ac68
children
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package de.intevation.flys.model;

import java.util.List;
import java.util.Comparator;

import java.io.Serializable;

import java.awt.geom.Point2D;

public class FastCrossSectionLine
implements   Serializable
{
    public static final double EPSILON = 1e-5;

    public static final Comparator<FastCrossSectionLine> KM_CMP =
        new Comparator<FastCrossSectionLine>() {
            public int compare(
                FastCrossSectionLine a,
                FastCrossSectionLine b
            ) {
                double diff = a.km - b.km;
                if (diff < -EPSILON) return -1;
                return diff > +EPSILON ? +1 : 0;
            }
        };

    protected double km;
    protected List<Point2D> points;

    public FastCrossSectionLine() {
    }

    public FastCrossSectionLine(double km) {
        this.km = km;
    }

    public FastCrossSectionLine(double km, List<Point2D> points) {
        this(km);
        this.points = points;
    }

    public FastCrossSectionLine(CrossSectionLine csl) {
        Double kmBD = csl.getKm();
        km = kmBD != null ? kmBD.doubleValue() : 0d;
        points = csl.fetchCrossSectionLinesPoints();
    }

    public double getKm() {
        return km;
    }

    public void setKm(double km) {
        this.km = km;
    }

    public List<Point2D> getPoints() {
        return points;
    }

    public void setPoints(List<Point2D> points) {
        this.points = points;
    }

    public double [][] fetchCrossSectionProfile() {
        return CrossSectionLine.fetchCrossSectionProfile(points);
    }
}
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