Currently access is divided up between a direct POSIX interface to datasets held on a parallel file system and services such as HTTP, ftp and OPeNDAP for remote access. Ideally access should be performant but at the same time easily accessible for compute clients be they within or outside of the infrastructure. Data access services are fundamental to this model. JASMIN has been in operation since 2012 and models the paradigm of bringing compute to the data providing direct access to a curated archive of data, user managed group workspaces together with a batch compute environment Lotus and a community. We explore the role of cloud architecture in the evolution of JASMIN, a multi-petabyte data analysis facility for the Natural Environment Research Council. What youll learn How to set permissions and more with the classic File class How to build a flat file database with RandomAccessFileGet to know the byte array, file, filter, and other kinds of streams Master serialization and externalization Discover character streams and their associated writers/readers Tour the buffer APIs Work with channels to transfer buffers to and from I/O services Find out about selectors and readiness selection Master regular expressions Discover charsets and their association with Java's String Take advantage of the formatter API to create formatted output How to customize the formatter APIExplore the improved file system interface Discover asynchronous I/O and its association with futures and completion handlers Encounter socket channel improvements, including multicasting Who this book is for This book is for those experienced with Java, beyond the fundamentals. After reading and using thi book, you'll gain the accelerated knowledge and skill level to really build applications with efficient data access, especially for today's cloud computing streaming data needs. Finally, you'll discover NIO.2's offerings in terms of an improved file system interface, asynchronous I/O, and the completion of socket channel functionality. Next, you'll learn about NIO's buffer, channel, selector, regular expression, charset, and formatter APIs. In this book, you'll learn about classic I/O APIs (File, RandomAccessFile, the stream classes and related types, and the reader/writer classes). Java I/O, NIO, and NIO.2 is a power-packed book that accelerates your mastery of Java's various I/O APIs.
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