[HWKMETRICS-185] Port over the eager extension classes.

api/metrics-api-jaxrs-1.1/src/main/java/org/hawkular/metrics/api/jaxrs/util/Eager.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2014-2015 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.hawkular.metrics.api.jaxrs.util;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * This class was taken from http://www.javacodegeeks.com/2013/02/jsf-eager-cdi-beans.html
+ * <br><br>
+ * Note: Since this is a general purpose utility, it make make sense to move it to a common
+ * module where all of the various hawkular components can use it.
+ *
+ * @author John Sanda
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface Eager {
+}

api/metrics-api-jaxrs-1.1/src/main/java/org/hawkular/metrics/api/jaxrs/util/EagerExtension.java

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+/*
+ * Copyright 2014-2015 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.hawkular.metrics.api.jaxrs.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.enterprise.context.ApplicationScoped;
+import javax.enterprise.event.Observes;
+import javax.enterprise.inject.spi.AfterDeploymentValidation;
+import javax.enterprise.inject.spi.Bean;
+import javax.enterprise.inject.spi.BeanManager;
+import javax.enterprise.inject.spi.Extension;
+import javax.enterprise.inject.spi.ProcessBean;
+
+/**
+ * This class was taken from http://www.javacodegeeks.com/2013/02/jsf-eager-cdi-beans.html
+ * <br><br>
+ * Note: Since this is a general purpose utility, it make make sense to move it to a common
+ * module where all of the various hawkular components can use it.
+ *
+ * @author John Sanda
+ */
+public class EagerExtension implements Extension {
+
+    private List<Bean<?>> eagerBeansList = new ArrayList<Bean<?>>();
+
+    public <T> void collect(@Observes ProcessBean<T> event) {
+        if (event.getAnnotated().isAnnotationPresent(Eager.class) &&
+            event.getAnnotated().isAnnotationPresent(ApplicationScoped.class)) {
+            eagerBeansList.add(event.getBean());
+        }
+    }
+    public void load(@Observes AfterDeploymentValidation event, BeanManager beanManager) {
+        for (Bean<?> bean : eagerBeansList) {
+            // note: toString() is important to instantiate the bean
+            //
+            // I found through testing that managed beans will get instantiated without the toString call; however,
+            // @PostConstruct methods in producer beans do not get called without the toString call. I have also
+            // noticed that with the toString call managed beans are instantiated twice. We may need modify this
+            // method to ensure we do not have the two constructor calls. It is not an immediate concern though since
+            // this is being introduced specifically for https://issues.jboss.org/browse/HWKMETRICS-23.
+            beanManager.getReference(bean, bean.getBeanClass(), beanManager.createCreationalContext(bean)).toString();
+        }
+    }
+
+}