Question

在我的mapstore中，hazelcast从MongoDB加载所有密钥

@Override
public Iterable<String> loadAllKeys() {
    System.out.println("LoadAllKeys");
    List<String> keys = new LinkedList<String>();
    FindIterable<Document> ids = collection.find().projection(Projections.include("_id"));
    for (Document document : ids) {
        keys.add(document.get("_id").toString());
    }
    return keys;
}

当它尝试将这些键作为对象加载时出现问题。它总是给我一个空列表：

@Override
public Map<String, MyObj > loadAll(Collection<String> keys) {
    System.out.println("LoadAll " + keys);
    HashMap<String, MyObj > result = new HashMap<String, MyObj >();
    FindIterable<Document> id = collection.find(in("_id", keys));
    for (Document document : id) {
        String name = (String) document.get("name");

        MyObj myObj= new MyObj();
        myObj.setname(name);

        result.put(document.get("_id").toString(), myObj);
    }
    return result;
}

原因是因为我的集合对象_id被ObjectId包装。例如：

"_id" : ObjectId("59b7dac41944ac39f8a299c3")

你能告诉我我哪里错了吗？我用这个链接作为参考： https://github.com/hazelcast/hazelcast-code-samples/tree/master/hazelcast-integration/mongodb

由于

hazelcast，mongodb persistance找不到_id

0 个答案: