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The java.nio.file package and its related package, java.nio.file.attribute, provide comprehensive support for file I/O and for accessing the file system. A zip file system provider is also available in JDK 7. The java.nio.file.LinkOption is an example of emulating extensible enums with interfaces. [6]
Concurrent data structures are significantly more difficult to design and to verify as being correct than their sequential counterparts. The primary source of this additional difficulty is concurrency, exacerbated by the fact that threads must be thought of as being completely asynchronous: they are subject to operating system preemption, page faults, interrupts, and so on.
Random access compared to sequential access. Random access (more precisely and more generally called direct access) is the ability to access an arbitrary element of a sequence in equal time or any datum from a population of addressable elements roughly as easily and efficiently as any other, no matter how many elements may be in the set.
8 File name and extension — together these form a 8.3 file name. 0x09 3 0x0C 20: Implementation dependent — should be initialised to zero before the FCB is opened. 0x20 1: Record number in the current section of the file — used when performing sequential access. 0x21 3: Record number to use when performing random access.
Indexed Sequential Access Method (ISAM) is a method for creating, maintaining, and manipulating computer files of data so that records can be retrieved sequentially or randomly by one or more keys. Indexes of key fields are maintained to achieve fast retrieval of required file records in indexed files .
Sequential access compared to random access. Sequential access is a term describing a group of elements (such as data in a memory array or a disk file or on magnetic-tape data storage) being accessed in a predetermined, ordered sequence. It is the opposite of random access, the ability to access an arbitrary element of a sequence as easily and ...
Thus, it is more convenient to use a base sequential language and insert API calls to parallel execution models via a programming model. Such parallel programming models can be classified according to abstractions that reflect the hardware, such as shared memory , distributed memory with message passing , notions of place visible in the code ...
JCSP is essentially a pure-Java API (although a research alternative exists that uses the C-CSP extension to the JVM). As such, it is in principle eminently suitable for concurrency in Scala and Groovy applications as well as Java ones. JCSP can therefore provide an alternative to Scala's actor model. JCSP uses synchronised communication and ...