view flys-backend/src/main/java/de/intevation/flys/model/FlowVelocityModel.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 c7ce7c9e405e
children
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package de.intevation.flys.model;

import de.intevation.flys.backend.SessionHolder;

import java.io.Serializable;

import java.util.List;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;

import org.apache.log4j.Logger;

import org.hibernate.Query;
import org.hibernate.Session;


@Entity
@Table(name = "flow_velocity_model")
public class FlowVelocityModel
implements   Serializable
{
    private static Logger logger = Logger.getLogger(FlowVelocityModel.class);


    private Integer id;

    private DischargeZone dischargeZone;

    private String description;


    public FlowVelocityModel() {
    }


    public FlowVelocityModel(DischargeZone dischargeZone) {
        this(dischargeZone, null);
    }


    public FlowVelocityModel(
        DischargeZone dischargeZone,
        String        description
    ) {
        this.dischargeZone = dischargeZone;
        this.description   = description;
    }

    @Id
    @SequenceGenerator(
        name           = "SEQUENCE_FLOW_VELOCITY_MODEL_ID_SEQ",
        sequenceName   = "FLOW_VELOCITY_MODEL_ID_SEQ",
        allocationSize = 1)
    @GeneratedValue(
        strategy  = GenerationType.SEQUENCE,
        generator = "SEQUENCE_FLOW_VELOCITY_MODEL_ID_SEQ")
    @Column(name = "id")
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    @OneToOne
    @JoinColumn(name = "discharge_zone_id")
    public DischargeZone getDischargeZone() {
        return dischargeZone;
    }

    public void setDischargeZone(DischargeZone dischargeZone) {
        this.dischargeZone = dischargeZone;
    }

    @Column(name = "description")
    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }


    public static List<FlowVelocityModel> getModels(DischargeZone zone) {

        Session session = SessionHolder.HOLDER.get();

        Query query = session.createQuery(
            "from FlowVelocityModel where dischargeZone=:zone");

        query.setParameter("zone", zone);

        return query.list();
    }
}
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