org.apache.nutch.tools

## Class ResolveUrls

- java.lang.Object
- - org.apache.nutch.tools.ResolveUrls

-     public class ResolveUrls
      extends Object

  A simple tool that will spin up multiple threads to resolve urls to ip addresses. This can be used to verify that pages that are failing due to UnknownHostException during fetching are actually bad and are not failing due to a dns problem in fetching.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ResolveUrls(String urlsFile)` Create a new ResolveUrls with a file from the local file system.
    `ResolveUrls(String urlsFile, int numThreads)` Create a new ResolveUrls with a urls file and a number of threads for the Thread pool.

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static void` | `main(String[] args)` Runs the resolve urls tool.
    `void` | `resolveUrls()` Creates a thread pool for resolving urls.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### ResolveUrls

          public ResolveUrls(String urlsFile)

      Create a new ResolveUrls with a file from the local file system.
      Parameters:
        `urlsFile` - The local urls file, one url per line.

    - #### ResolveUrls

          public ResolveUrls(String urlsFile,
                             int numThreads)

      Create a new ResolveUrls with a urls file and a number of threads for the Thread pool. Number of threads is 100 by default.
      Parameters:
        `urlsFile` - The local urls file, one url per line.
        `numThreads` - The number of threads used to resolve urls in parallel.

  - ### Method Detail

    - #### resolveUrls

          public void resolveUrls()

      Creates a thread pool for resolving urls. Reads in the url file on the local filesystem. For each url it attempts to resolve it keeping a total account of the number resolved, errored, and the amount of time.

    - #### main

          public static void main(String[] args)

      Runs the resolve urls tool.

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