Mastering Concurrency Programming with Java 9 - Second Edition: Fast, reactive and parallel application development by Javier Fernandez Gonzalez

Author:Javier Fernandez Gonzalez [Gonzalez, Javier Fernandez]
Language: eng
Format: epub
Tags: COM051220 - COMPUTERS / Programming / Parallel, COM051280 - COMPUTERS / Programming Languages / Java, COM051010 - COMPUTERS / Programming Languages / General
Publisher: Packt Publishing
Published: 2017-07-16T23:00:00+00:00

As we mentioned earlier, we have implemented the assignment and update phases as tasks to be implemented in the fork/join framework.

The assignment phase assigns a document to the cluster that has the lowest Euclidean distance from the document, so we have to process all the documents and calculate the Euclidean distances of all the documents and all the clusters. We are going to use the number of documents that a task has to decide whether we have to split the task or not. We start with the tasks that have to process all the documents, and we are going to split them until we have tasks that have to process a number of documents lower than a predefined size.

The AssignmentTask class has the following attributes:

The array of ConcurrentDocumentCluster objects with the data of the clusters

The array of ConcurrentDocument objects with the data of the documents

Two integer attributes, start and end, which determine the number of documents the task has to process

An AtomicInteger attribute, numChanges, which stores the number of documents that have changed their assigned cluster from the last execution to the current one

An integer attribute, maxSize, which stores the maximum number of documents a task can process

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