package org.dayatang.observer;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
import org.dayatang.domain.AbstractEntity;
import org.dayatang.domain.NamedParameters;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.persistence.*;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
@SuppressWarnings("rawtypes")
@Entity
@Table(name = "COMMONS_OBSERVER")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "OBSERVER_CATEGORY", discriminatorType = DiscriminatorType.STRING)
public abstract class Observer<T extends Subject> extends AbstractEntity {
/**
*
*/
private static final long serialVersionUID = 4841919329150188032L;
private static final Logger logger = LoggerFactory
.getLogger(Observer.class);
@ElementCollection
@CollectionTable(name = "COMMONS_OBSERVER_SUBJECTKEY", joinColumns = @JoinColumn(name = "OBSERVER_ID"))
@Column(name = "SUBJECT_KEY")
private Set<String> subjectKeys = new HashSet<String>();
public Set<String> getSubjectKeys() {
return subjectKeys;
}
public void setSubjectKeys(Set<String> subjectKeys) {
this.subjectKeys = subjectKeys;
}
@Override
public String toString() {
return ToStringBuilder.reflectionToString(this,
ToStringStyle.SHORT_PREFIX_STYLE);
}
/*
* =======================================
*
* action
*
* ========================================
*/
public abstract void process(T subject);
public static Observer get(Long id) {
return getRepository().get(Observer.class, id);
}
public static List<Observer> findBySubject(Subject subject) {
String queryString = "select o from Observer o where :subjectKey in elements(o.subjectKeys))";
NamedParameters params = NamedParameters.create().add("subjectKey", subject.getSubjectKey());
List<Object> observers = getRepository().createJpqlQuery(queryString)
.addParameter("subjectKey", subject.getSubjectKey()).list();
if (logger.isDebugEnabled()) {
if (observers.isEmpty()) {
logger.debug("没有找到一个观察者：subjectKey为【{}】",
subject.getSubjectKey());
} else {
for (Object observer : observers) {
logger.debug("找到一个观察者：subjectKey为【{}】，observer为【{}】",
subject.getSubjectKey(), observer);
}
}
}
List<Observer> results = new ArrayList<Observer>();
for (Object observer : observers) {
results.add((Observer) observer);
}
return results;
}
}