[POLICY-30] optional loadable eelf feature

for backwards compatibility purposes or if desired to
use EELF and common-framework (from policy-common) for
logging purposes in miscellaneous environments.   It supports
EELF/Common Framework style logging at the same time than
traditional logging.

This functionality is an optional loadable module.

policy-docker changes need to be made to optionally
unpack to make it active (in a different submission).

started marking feature projects with feature prefix in
project name to give a clear picture to the community which
modules are features vs. code base.

Change-Id: I5076c462409f03415ce54f0c9b5f50b78abb18f9
Signed-off-by: Jorge Hernandez <jh1730@att.com>

1 files changed, 89 insertions, 0 deletions

diff --git a/feature-eelf/src/main/java/org/openecomp/policy/drools/eelf/EelfFeature.java b/feature-eelf/src/main/java/org/openecomp/policy/drools/eelf/EelfFeature.java
new file mode 100644
index 00000000..de39f3a3
--- /dev/null
+++ b/feature-eelf/src/main/java/org/openecomp/policy/drools/eelf/EelfFeature.java
@@ -0,0 +1,89 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * feature-eelf
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.policy.drools.eelf;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import org.openecomp.policy.common.logging.flexlogger.FlexLogger;
+import org.openecomp.policy.common.logging.flexlogger.Logger;
+import org.openecomp.policy.drools.features.PolicyEngineFeatureAPI;
+import org.openecomp.policy.drools.system.Main;
+import org.openecomp.policy.drools.system.PolicyEngine;
+
+public class EelfFeature implements PolicyEngineFeatureAPI {
+	
+	/**
+	 * EELF logback configuration path system property
+	 */
+	public static final String EELF_LOGBACK_PATH_SYSTEM_PROPERTY = "com.att.eelf.logging.file";
+	
+	/**
+	 * EELF logback configuration path value
+	 */
+	public static final String EELF_LOGBACK_PATH_DEFAULT = "config";
+	
+	/**
+	 * EELF logback configuration file system property
+	 */
+	public static final String EELF_LOGBACK_FILE_SYSTEM_PROPERTY = "com.att.eelf.logging.path";
+	
+	/**
+	 * EELF logback configuration file default value
+	 */
+	public static final String EELF_LOGBACK_FILE_DEFAULT = "logback.xml";
+
+	@Override
+	public boolean beforeBoot(PolicyEngine engine, String cliArgs[]) {
+		
+		String logback = System.getProperty(Main.LOGBACK_CONFIGURATION_FILE_SYSTEM_PROPERTY, 
+				                            Main.LOGBACK_CONFIGURATION_FILE_DEFAULT);
+		
+		Path logbackPath = Paths.get(logback);
+		
+		if (System.getProperty(EELF_LOGBACK_PATH_SYSTEM_PROPERTY) == null)
+			System.setProperty(EELF_LOGBACK_PATH_SYSTEM_PROPERTY, logbackPath.getFileName().toString());
+		
+		if (System.getProperty(EELF_LOGBACK_FILE_SYSTEM_PROPERTY) == null)
+			System.setProperty(EELF_LOGBACK_FILE_SYSTEM_PROPERTY, 
+					           logbackPath.toAbsolutePath().getParent().toString());
+		
+		Logger logger = FlexLogger.getLogger(this.getClass(), true);
+		
+		logger.warn("EELF/Common Frameworks Logging Enabled");
+		if (logger.isInfoEnabled()) {
+			logger.info("EELFFeature: Property " + Main.LOGBACK_CONFIGURATION_FILE_SYSTEM_PROPERTY + "=" + 
+			            System.getProperty(Main.LOGBACK_CONFIGURATION_FILE_SYSTEM_PROPERTY));
+			logger.info("EELFFeature: Property " + EELF_LOGBACK_PATH_SYSTEM_PROPERTY + "=" + 
+		                System.getProperty(EELF_LOGBACK_PATH_SYSTEM_PROPERTY));
+			logger.info("EELFFeature: Property " + EELF_LOGBACK_FILE_SYSTEM_PROPERTY + "=" + 
+	                    System.getProperty(EELF_LOGBACK_FILE_SYSTEM_PROPERTY));
+		}
+		
+		return false;
+	};
+	
+	@Override
+	public int getSequenceNumber() {
+		return 0;
+	}
+
+}