fix eager singleton loading

scm-webapp/src/main/java/sonia/scm/EagerSingletonModule.java

@@ -0,0 +1,132 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. 2. Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution. 3. Neither the name of SCM-Manager;
+ * nor the names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm;
+
+//~--- non-JDK imports --------------------------------------------------------
+
+import com.google.common.collect.Sets;
+import com.google.inject.AbstractModule;
+import com.google.inject.Injector;
+import com.google.inject.TypeLiteral;
+import com.google.inject.matcher.AbstractMatcher;
+import com.google.inject.matcher.Matcher;
+import com.google.inject.spi.TypeEncounter;
+import com.google.inject.spi.TypeListener;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+//~--- JDK imports ------------------------------------------------------------
+
+import java.lang.annotation.Annotation;
+
+import java.util.Set;
+
+/**
+ *
+ * @author Sebastian Sdorra
+ */
+public class EagerSingletonModule extends AbstractModule
+{
+
+  /**
+   * the logger for EagerSingletonModule
+   */
+  private static final Logger logger =
+    LoggerFactory.getLogger(EagerSingletonModule.class);
+
+  //~--- methods --------------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @param injector
+   */
+  void initialize(Injector injector)
+  {
+    for (Class<?> clazz : eagerSingletons)
+    {
+      logger.info("initialize eager singleton {}", clazz.getName());
+      injector.getInstance(clazz);
+    }
+  }
+
+  /**
+   * Method description
+   *
+   */
+  @Override
+  protected void configure()
+  {
+    bindListener(isAnnotatedWith(EagerSingleton.class), new TypeListener()
+    {
+
+      @Override
+      public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter)
+      {
+        eagerSingletons.add(type.getRawType());
+      }
+    });
+
+    bind(EagerSingletonModule.class).toInstance(this);
+  }
+
+  //~--- get methods ----------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   *
+   * @param annotation
+   *
+   * @return
+   */
+  private Matcher<TypeLiteral<?>> isAnnotatedWith(
+    final Class<? extends Annotation> annotation)
+  {
+    return new AbstractMatcher<TypeLiteral<?>>()
+    {
+      @Override
+      public boolean matches(TypeLiteral<?> type)
+      {
+        return type.getRawType().isAnnotationPresent(annotation);
+      }
+    };
+  }
+
+  //~--- fields ---------------------------------------------------------------
+
+  /** Field description */
+  private final Set<Class<?>> eagerSingletons = Sets.newHashSet();
+}