The tempus-fugit Callable interface extends java.util.concurrent.Callable but allows you to specify the exception as a generic type. This class has a fairly limited usage and isn't recommended over the standard Java version. Instead, if you create a method that takes a java.util.concurrent.Callable as a argument, calling it will force the method to throw Exception. If instead, you pass in a com.google.code.tempusfugit.concurrency.Callable, you can specify the specific exception to throw and therefore avoid being forced to throw Exception. For example

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public <T> T foo(java.util.concurrent.Callable<T> callable) throws Exception {
    return callable.call();
}

Whereas using the tempus-fugit version allows a more specific exception to be thrown.

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public <T> T bar(com.google.code.tempusfugit.concurrency.Callable<T, RuntimeException> callable) {
    return callable.call();
}

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