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    <p>You might need to make a Factory for the MyConnectionFactory, but only if you actually need to vary the parameters passed to MyConnectionFactory at runtime. Otherwise, you can get away with making a <code>Provider</code>—which is a Factory after all, I guess—or its slimmer cousin <a href="https://code.google.com/p/google-guice/wiki/ProvidesMethods" rel="nofollow">the @Provides Method</a>. (I'm guessing the class in question takes unspecific or primitive arguments, or else a <a href="https://code.google.com/p/google-guice/wiki/ToConstructorBindings" rel="nofollow"><code>toConstructor binding</code></a> is yet another possibility.)</p> <p>The Factory would look like this:</p> <pre><code>public class MyConnectionFactoryFactory { @Inject Provider&lt;SomeDependency&gt; someDependencyProvider; public MyConnectionFactory create(String url) { return new MyConnectionFactory(someDependencyProvider.get(), url, 10000); } } </code></pre> <p>The Provider would look identical, except it'd implement <code>Provider&lt;MyConnectionFactory&gt;</code> and <code>create</code> would instead be a zero-arg <code>get()</code>. You can bind that through <code>bind(MyConnectionFactory.class).toProvider(MyConnectionFactoryProvider.class)</code>.</p> <p>However, if you know all your constructor parameters at configuration time, you could equally create a <code>@Provides</code> method in your Module, which would look like this:</p> <pre><code>public class MyModule extends AbstractModule { @Override public void configure() { /* your configuration here */ } /* FYI: a @Provides method by any other name would return as sweet */ @Provides MyConnectionFactory getConnectionFactory(SomeDependency dependency) { return new MyConnectionFactory(dependency, url, 10000); } } </code></pre> <p>...which takes your "wrapper code" boilerplate to three extra non-blank lines. Remember, Guice will automatically bind any combination of <code>X</code>, <code>Provider&lt;X&gt;</code>, or <code>@Provides X</code> to any injection of <code>X</code> or <code>Provider&lt;X&gt;</code> automatically for you, so feel free to bind it however is most convenient.</p>
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    1. POGoogle Guice - How to pass a parameter to a third party library Factory class
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    1. USJeff Bowman
    1. USJeff Bowman
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    1. POGoogle Guice - How to pass a parameter to a third party library Factory class
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    1. COThanks a ton, it seems I misunderstood the usage of @Provides. Your second example is exactly what I wanted to do, essentially load properties from a file at configuration time and pass them into the factory.
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      1. USDerek Gourlay
 

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