Issue #513

mdw-services/src/com/centurylink/mdw/timer/startup/UserGroupMonitor.java

@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2017 CenturyLink, Inc.
+ *
+ * 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 com.centurylink.mdw.timer.startup;
+
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+
+import com.centurylink.mdw.config.PropertyManager;
+import com.centurylink.mdw.constant.PropertyNames;
+import com.centurylink.mdw.dataaccess.DbAccess;
+import com.centurylink.mdw.service.data.task.UserGroupCache;
+import com.centurylink.mdw.services.cache.CacheRegistration;
+import com.centurylink.mdw.startup.StartupException;
+import com.centurylink.mdw.startup.StartupService;
+import com.centurylink.mdw.util.log.LoggerUtil;
+import com.centurylink.mdw.util.log.StandardLogger;
+
+/**
+ * Checks for asset imports performed on other instances
+ */
+public class UserGroupMonitor implements StartupService {
+
+    private static StandardLogger logger = LoggerUtil.getStandardLogger();
+
+    private static boolean _terminating;
+    private static UserGroupMonitor monitor = null;
+    private static Thread thread = null;
+
+    /**
+     * Invoked when the server starts up.
+     */
+    public void onStartup() throws StartupException {
+        if (monitor == null) {
+            monitor = this;
+            thread = new Thread() {
+                @Override
+                public void run() {
+                    this.setName("UserGroupMonitor-thread");
+                    monitor.start();
+                }
+            };
+            thread.start();
+        }
+    }
+
+    public void onShutdown() {
+        _terminating = true;
+        thread.interrupt();
+    }
+
+    public void start() {
+        try {
+            Long interval = PropertyManager.getLongProperty(PropertyNames.MDW_USERGROUP_MONITOR_INTERVAL, 120000); //Defaults to checking every 120 seconds
+            _terminating = false;
+
+            while (!_terminating) {
+                try {
+                    Thread.sleep(interval);
+
+                    // Check if it needs to trigger a UserGroup cache refresh
+                    String select = "select mod_dt from value where name= ? and owner_type= ? and owner_id= ?";
+                    try (DbAccess dbAccess = new DbAccess(); PreparedStatement stmt = dbAccess.getConnection().prepareStatement(select)) {
+                        stmt.setString(1, "LastUserGroupChange");
+                        stmt.setString(2, "UserGroupAdmin");
+                        stmt.setString(3, "0");
+                        long latestChange = 0;
+                        try (ResultSet rs = stmt.executeQuery()) {
+                            if (rs.next()) {
+                                latestChange = rs.getTimestamp("mod_dt").getTime();
+                            }
+                        }
+                        // Proceed if user changes have occurred on another instance
+                        if (latestChange > 0 && latestChange > UserGroupCache.getLastUserSync()) {
+                            logger.info("Detected User/Group changes.  Refreshing...");
+                            CacheRegistration.getInstance().refreshCache("UserGroupCache");
+                        }
+                    }
+                }
+                catch (InterruptedException e) {
+                    if (!_terminating) throw e;
+                    logger.info(this.getClass().getName() + " stopping.");
+                }
+            }
+        }
+        catch (Exception e) {
+            logger.severeException(e.getMessage(), e);
+        }
+        finally {
+            if (!_terminating) this.start();  // Restart if a failure occurred, besides instance is shutting down
+        }
+    }
+}