Spring和Morphia,MongoDB的简单封装以及自增ID的实现（转）

原文地址：http://www.oschina.net/code/snippet_98659_3681
一个对Spring和Morphia的简单封装，主要针对Mongo的自增ID实现以及方便与Spring的集成。
标签： Spring , mongodb , morphia , nosql
代码片段(15)
[代码] [Java]代码
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package com.paojiao.nosql.mongo;
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import com.google.code.morphia.annotations.Entity;
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import com.google.code.morphia.annotations.Id;
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import java.io.Serializable;
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/**
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* Created by IntelliJ IDEA.
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* User: Arden
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* Date: 11-3-26
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* Time: 下午12:42
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* To change this template use File | Settings | File Templates.
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*/
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@Entity(value = "sequence", noClassnameStored=true)
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public class MongoSequence implements Serializable {
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    @Id
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    private String collName;
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    private Long value;
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    public MongoSequence(){
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    }
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    public MongoSequence(String collName) {
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        this.collName = collName;
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    }
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    public String getCollName() {
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        return collName;
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    }
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    public void setCollName(String collName) {
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        this.collName = collName;
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    }
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    public Long getValue() {
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        return value;
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    }
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    public void setValue(Long value) {
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        this.value = value;
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    }
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}
[代码] [Java]代码
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package com.paojiao.nosql.mongo;
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import com.google.code.morphia.Datastore;
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import com.google.code.morphia.Morphia;
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import com.mongodb.Mongo;
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import com.paojiao.session.Session;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.Map;
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/**
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* Created by IntelliJ IDEA.
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* User: Arden
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* Date: 11-3-26
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* Time: 下午12:55
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* To change this template use File | Settings | File Templates.
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*/
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public class MongoSequenceManager extends MongoDAO<MongoSequence, String> {
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    // mongodb日志记录器
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    private final Logger logger = LoggerFactory.getLogger(this.getClass());
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    // 序列映射
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    private Map<String, Long> sequenceMap = null;
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    public MongoSequenceManager(Datastore ds) {
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        super(ds);
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        this.entityClazz = MongoSequence.class;
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    }
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    public void setSequenceMap(Map<String, Long> sequenceMap) {
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        this.sequenceMap = sequenceMap;
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    }
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    /**
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     * 获得序列初始值
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     * @param collName
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     * @return
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     */
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    public Long getSequenceStartNumber(String collNam