Author: limpbizkit
Date: Mon Mar 2 21:05:27 2009
New Revision: 892
Added:
wiki/ProvidesMethods.wiki
Log:
Created wiki page through web user interface.
Added: wiki/ProvidesMethods.wiki
==============================================================================
--- (empty file)
+++ wiki/ProvidesMethods.wiki Mon Mar 2 21:05:27 2009
@@ -0,0 +1,28 @@
+...@provides Methods=
+When you need code to create an object, use an `...@provides` method. The
method must be defined within a module, and it must have an `...@provides`
annotation. The method's return type is the bound type. Whenever the
injector needs an instance of that type, it will invoke the method.
+{{{
+public class BillingModule extends AbstractModule {
+ @Override
+ protected void configure() {
+ ...
+ }
+
+ @Provides
+ TransactionLog provideTransactionLog() {
+ DatabaseTransactionLog transactionLog = new DatabaseTransactionLog();
+ transactionLog.setJdbcUrl("jdbc:mysql://localhost/pizza");
+ transactionLog.setThreadPoolSize(30);
+ return transactionLog;
+ }
+}
+}}}
+If the `...@provides` method has a binding annotation like `...@paypal` or
`...@named("Checkout")`, Guice binds the annotated type. Dependencies can be
passed in as parameters to the method. The injector will exercise the
bindings for each of these before invoking the method.
+{{{
+ @Provides @PayPal
+ CreditCardProcessor providePayPalCreditCardProcessor(
+ @Named("PayPal API key") String apiKey) {
+ PayPalCreditCardProcessor processor = new PayPalCreditCardProcessor();
+ processor.setApiKey(apiKey);
+ return processor;
+ }
+}}}
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