程序员的量化交易之路（24）--Cointrader之RemoteEvent远程事件实体（11）

转载需注明出处：http://blog.youkuaiyun.com/minimicall,http://cloudtrader.top/

在量化交易系统中，有些事件是远端传来的，比如股票的价格数据等。所以，在这一节我们定义了一个远端事件实体。

它是一个基类，并不单独生成数据表。具体代码如下：

package org.cryptocoinpartners.schema;

import javax.annotation.Nullable;
import javax.persistence.Basic;
import javax.persistence.MappedSuperclass;
import javax.persistence.Transient;

import org.hibernate.annotations.Type;
import org.joda.time.Instant;

@MappedSuperclass
public abstract class RemoteEvent extends Event {

    /**
     * @return the time when this event object was created.  it may be later than getTime() due to transmission delays
     */
    @Type(type = "org.jadira.usertype.dateandtime.joda.PersistentInstantAsMillisLong")
    @Basic(optional = false)
    public Instant getTimeReceived() {
        return timeReceived;
    }

    @Transient
    public long getTimestampReceived() {
        return timestampReceived;
    }

    @Basic(optional = true)
    public String getRemoteKey() {
        return remoteKey;
    }

    @Override
    public void publishedAt(Instant instant) {
        super.publishedAt(instant);
        if (timeReceived == null)
            timeReceived = instant;
        this.timestampReceived = timeReceived.getMillis();

    }

    protected RemoteEvent(Instant time, @Nullable String remoteKey) {
        this(time, Instant.now(), remoteKey);
    }

    protected RemoteEvent(Instant time, Instant timeReceived, @Nullable String remoteKey) {
        super(time);
        this.remoteKey = remoteKey;
        this.timeReceived = timeReceived;
        this.timestampReceived = timeReceived.getMillis();
    }

    // JPA
    protected RemoteEvent() {
    }

    protected void setTimeReceived(Instant timeReceived) {
        this.timeReceived = timeReceived;
        this.timestampReceived = timeReceived.getMillis();
    }

    protected void setRemoteKey(@Nullable String remoteKey) {
        this.remoteKey = remoteKey;
    }

    private Instant timeReceived;
    private long timestampReceived;
    private String remoteKey;
}