HONEYCOMB-358 - Activation module

Provides module that provides set of distribution started modules

Change-Id: I54287cc17f3af7d51a47a7342e5b8496e5ade00e
Signed-off-by: Jan Srnicek <jsrnicek@cisco.com>

1 files changed, 57 insertions, 0 deletions

diff --git a/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/activation/ActiveModules.java b/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/activation/ActiveModules.java
new file mode 100644
index 000000000..f729f00b9
--- /dev/null
+++ b/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/activation/ActiveModules.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * 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 io.fd.honeycomb.infra.distro.activation;
+
+import static java.lang.String.format;
+
+import com.google.inject.Module;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/**
+ * Provides static set of active activeModulesClasses
+ */
+public class ActiveModules {
+    private final Set<Class<? extends Module>> activeModulesClasses;
+
+    public ActiveModules(final Set<Class<? extends Module>> activeModulesClasses) {
+        this.activeModulesClasses = activeModulesClasses;
+    }
+
+    public Set<Class<? extends Module>> getActiveModulesClasses() {
+        return activeModulesClasses;
+    }
+
+    public Set<? extends Module> createModuleInstances() {
+        return activeModulesClasses.stream()
+                .map(moduleClass -> {
+                    try {
+                        return moduleClass.newInstance();
+                    } catch (InstantiationException | IllegalAccessException e) {
+                        throw new IllegalStateException(format("Unable to create instance of module %s", moduleClass),
+                                e);
+                    }
+                }).collect(Collectors.toSet());
+    }
+
+    @Override
+    public String toString() {
+        return "ActiveModules{" +
+                "activeModulesClasses=" + activeModulesClasses +
+                '}';
+    }
+}