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So, for every asynchronous resource fetch we Same thing we did for the pages, which is maintain a list of all the outstanding resource get’sĪnd then wait for all of them to complete before consolidating the results. The important question now becomes how do we get the results from these resources.
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Once the HTML is fetched, it is parsed and for each of the resources found, a new request
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Page in turn starts with the base page URL and starts an asynchronous computation to fetch the The main thread, having “forked”Īll the pages, then just waits for them to complete, collects and prints the results. We can visualize one possible approach to this problem as follows:įor every web-page given, we start an asynchronous computation. The bytes received to get the total page weight. HTML to find the unique references as above, download those resources and finally sum the total size of So the idea is that given a webpage URL, fetch the page, parse the
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The size of all the assets it references, namely, css, image and js files in link, img and We can define the size of the webpage as the size of the original HTML for the page, along with Say, we have a list of webpage URLs, and we want to find out what the size of the webpage is. In this post we will look at a small I/O intesive problem and one possible way we could use theseĬapabilities and to reason about and chain these asynchronous concurrent operations using Java 8.The completeĬode is available on GitHub at satyasm/JavaPageSize and canīe built using maven as documented in the README.md The computations / transformations independent of the actual worked performed at each step.
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Further the introduction ofĮasy to represent the code for these transformations succinctly. Java 8 introduces the concept of aĪs a way to compose these values together using aįor running the actual computations. Unlike Go, focuses on the values being produced as the main fulcrum for organizing and schedulingĬoncurrent and asynchronous tasks. Concurrency in practice - Java | Satyadeep Musuvathy Satyadeep Musuvathy An Architect's Musings On Software Design « Home Concurrency in practice - Java November 20, 2017
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