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Unique Identity (UID)
How can we obtain a unique identifier which is unique across the various JVMs? In this article, I show you the…
Browsing: Data Structures
Data Structures and Algorithms
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Kahadb – Transaction State
Transaction State In order to know what happens during a commit or a rollback, we need to know what kind…
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Kahadb – Transaction Store
Storing an Object In the code below, our purpose is to store a Book object to the page file. Transaction…
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Kahadb – Transaction load
Loading a Page When a page is requested, instead of reading it from disk, it is first looked into the…
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Kahadb – PageFile
Introduction Kahadb is the file persistence database. ActiveMQ uses it to persist the messages. It is made up of four…
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BitArrayBin
BitArrayBin is class from ActiveMQ and is used to set true/false against some long index. This is useful if we want to…
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Journal Metadata and Index
In this article, I show you an insight into the internals of Journal Metadata and its index. Location Each journal record…
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Journal Data File
Structure of Journal Data File Each batch record starts with a batch header. Batch header consists of the batch header…
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DataFileAccessorPool
Use case: Get a data file accessor from the pool for file 1 Since its the first time a data…
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Transport Connector – Client connects
In this article we discuss how a client connects to a broker service. Client needs to know the broker URL…
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TransportConnector – Broker Starts
In this article we discuss what happens when we set a transport connector to a broker service and start the…
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FactoryFinder
In this article, we describe the default strategy that the FactoryFinder uses to find, load and instantiate Objects. FactoryFinder is responsible for…
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File Persistence of B-Tree Index
This article gives an insight into file persistence of B-Tree Index. Initialization A node with null parent is called root…