// route: from("direct:aggregate").to("mongodb3:myDb?database=science&collection=notableScientists&operation=aggregate");
List<Bson> aggregate = Arrays.asList(match(or(eq("scientist", "Darwin"), eq("scientist",
group("$scientist", sum("count", 1)));
from("direct:aggregate")
.setBody().constant(aggregate)
.to("mongodb3:myDb?database=science&collection=notableScientists&operation=aggregate")
.to("mock:resultAggregate");
// route: from("direct:aggregate").to("mongodb3:myDb?database=science&collection=notableScientists&operation=aggregate");
List<Bson> aggregate = Arrays.asList(match(or(eq("scientist", "Darwin"), eq("scientist",
group("$scientist", sum("count", 1)));
from("direct:aggregate")
.setBody().constant(aggregate)
.to("mongodb3:myDb?database=science&collection=notableScientists&operation=aggregate")
.to("mock:resultAggregate");
Copy to Clipboard
Copied!
Toggle word wrap
Toggle overflow
默认情况下，返回所有结果的列表。根据结果的大小，这可能会对内存进行重量。更安全的方法是设置 outputType=MongoIterable。下一个处理器将在消息正文中看到一个不可避免的，允许它按一步调试结果。因此，设置批处理大小并返回它可允许有效地检索和处理结果。
您还可以通过包含 outputType=DBCursor (Camel 2.21+)作为 endpoint 选项，从服务器返回至您的路由的文档可能比设置上述标头更简单。这了来自 Mongo 驱动程序的 DBCursor，就像您在 Mongo shell 中执行 aggregate （）一样，允许您的路由迭代结果。默认情况下，如果不使用此选项，此组件会将驱动程序的光标中的文档加载到列表，并将此数据返回到您的路由 - 这可能导致大量内存对象。请记住，使用 DBCursor 并不要求提供匹配的文档数量 - 请参阅 MongoDB 文档网站了解详细信息。
// route: from("direct:aggregate").to("mongodb3:myDb?database=science&collection=notableScientists&operation=aggregate&outputType=MongoIterable");
List<Bson> aggregate = Arrays.asList(match(or(eq("scientist", "Darwin"), eq("scientist",
group("$scientist", sum("count", 1)));
from("direct:aggregate")
.setHeader(MongoDbConstants.BATCH_SIZE).constant(10)
.setBody().constant(aggregate)
.to("mongodb3:myDb?database=science&collection=notableScientists&operation=aggregate&outputType=MongoIterable")
.split(body())
.streaming()
.to("mock:resultAggregate");
// route: from("direct:aggregate").to("mongodb3:myDb?database=science&collection=notableScientists&operation=aggregate&outputType=MongoIterable");
List<Bson> aggregate = Arrays.asList(match(or(eq("scientist", "Darwin"), eq("scientist",
group("$scientist", sum("count", 1)));
from("direct:aggregate")
.setHeader(MongoDbConstants.BATCH_SIZE).constant(10)
.setBody().constant(aggregate)
.to("mongodb3:myDb?database=science&collection=notableScientists&operation=aggregate&outputType=MongoIterable")
.split(body())
.streaming()
.to("mock:resultAggregate");
Copy to Clipboard
Copied!
Toggle word wrap
Toggle overflow
红帽全球峰会
'%20d='M201.5%20305.5c-13.8%200-24.9-11.1-24.9-24.6%200-13.8%2011.1-24.9%2024.9-24.9%2013.6%200%2024.6%2011.1%2024.6%2024.9%200%2013.6-11.1%2024.6-24.6%2024.6zM504%20256c0%20137-111%20248-248%20248S8%20393%208%20256%20119%208%20256%208s248%20111%20248%20248zm-132.3-41.2c-9.4%200-17.7%203.9-23.8%2010-22.4-15.5-52.6-25.5-86.1-26.6l17.4-78.3%2055.4%2012.5c0%2013.6%2011.1%2024.6%2024.6%2024.6%2013.8%200%2024.9-11.3%2024.9-24.9s-11.1-24.9-24.9-24.9c-9.7%200-18%205.8-22.1%2013.8l-61.2-13.6c-3-.8-6.1%201.4-6.9%204.4l-19.1%2086.4c-33.2%201.4-63.1%2011.3-85.5%2026.8-6.1-6.4-14.7-10.2-24.1-10.2-34.9%200-46.3%2046.9-14.4%2062.8-1.1%205-1.7%2010.2-1.7%2015.5%200%2052.6%2059.2%2095.2%20132%2095.2%2073.1%200%20132.3-42.6%20132.3-95.2%200-5.3-.6-10.8-1.9-15.8%2031.3-16%2019.8-62.5-14.9-62.5zM302.8%20331c-18.2%2018.2-76.1%2017.9-93.6%200-2.2-2.2-6.1-2.2-8.3%200-2.5%202.5-2.5%206.4%200%208.6%2022.8%2022.8%2087.3%2022.8%20110.2%200%202.5-2.2%202.5-6.1%200-8.6-2.2-2.2-6.1-2.2-8.3%200zm7.7-75c-13.6%200-24.6%2011.1-24.6%2024.9%200%2013.6%2011.1%2024.6%2024.6%2024.6%2013.8%200%2024.9-11.1%2024.9-24.6%200-13.8-11-24.9-24.9-24.9z'/%3e%3c/svg%3e){kind=small}