3.2. 查询 ProtoStream 通用类型

流程

1. 在类中添加索引注解，如下例所示：

   @Indexed
   public class CalculusIndexed {
       @Basic
       @ProtoField(value = 1)
       public BigInteger getPurchases() {
         return purchases;
       }
   
       @Decimal // the scale is 2 by default
       @ProtoField(value = 2)
       public BigDecimal getProspect() {
         return prospect;
       }
   }

2. 将 dependentOn 属性设置为 CommonTypes.class，以指示生成的 Protobuf 模式可以引用和使用 CommonTypes 类型，如 BigInteger 和 BigDecimal ：

   @ProtoSchema(includeClasses = CalculusIndexed.class, dependsOn = CommonTypes.class,
        schemaFilePath = "/protostream", schemaFileName = "calculus-indexed.proto",
        schemaPackageName = "lab.indexed")
   public interface CalculusIndexedSchema extends GeneratedSchema {
   }

3. 执行查询：

   Query<Product> query = cache.query("from lab.indexed.CalculusIndexed c where c.purchases > 9");
   QueryResult<Product> result = query.execute();
   // play with the result
   
   query = cache.query("from lab.indexed.CalculusIndexed c where c.prospect = 2.2");
   result = query.execute();
   // play with the result