编年史与编年史队列包

Question

我刚刚开始使用编年史队列 - 但是我有点困惑 API 用于 reading/writing 队列。具体来说 chronicle-queue-5 vs chronicle-3.5.*

我已经完成了使用编年史的 link which basically uses chronicle-queue API , but there are others like this。

下面这两个有什么区别？

 Chronicle chronicle =  ChronicleQueueBuilder.indexed(_location).build();
 ExcerptAppender appender = chronicle.createAppender();
 appender.startExcerpt();
 appender.writeUTF("Hello World");

对

ChronicleQueue queue = ChronicleQueue.singleBuilder(_location).build();
final net.openhft.chronicle.queue.ExcerptAppender appender = queue.acquireAppender();
 try (DocumentContext dc = appender.writingDocument()) 
 {
     dc.wire().write("hello").text("world " );
 }

ChronicleQueue 的 Javadoc 文档和 Chronicle 看起来很像

Answer 1

他们都在向编年史队列写入消息。我相信这个

Chronicle chronicle =  ChronicleQueueBuilder.indexed(_location).build();
ExcerptAppender appender = chronicle.createAppender();
appender.startExcerpt();
appender.writeUTF("Hello World");

现在可以像这样写入编年史队列 5

try (final ChronicleQueue queue = SingleChronicleQueueBuilder.binary("temp-dir").build()) {
   final ExcerptAppender appender = queue.acquireAppender();
   appender.writeText("Hello World");
}

或者如果你想存储 key:value 数据，像这样

try (final ChronicleQueue queue = SingleChronicleQueueBuilder.binary("temp-dir-2").build()) {
  final ExcerptAppender appender = queue.acquireAppender();
  try (DocumentContext dc = appender.writingDocument()) {
    dc.wire().write("hello").text("world");
  }
  DumpQueueMain.dump("temp-dir-2");
}

你可以使用

DumpQueueMain.dump("temp-dir-2");

查看数据是如何存储的，例如

# position: 131360, header: 2
--- !!data #binary
hello: world

编年史与编年史队列包

chronicle vs chronicle-queue package

java

chronicle

chronicle-queue