#1317 Special Case Pattern (#1624)

* #1317 Add Special Case Pattern To focus on pattern itself, I implement DB and maintenance lock by the singleton instance. * #1317 Add special cases unit tests Assert the logger output (ref: https://stackoverflow.com/a/52229629) * #1317 Add README.md Add Special Case Pattern README * #1317 Format: add a new line to end of file Co-authored-by: Subhrodip Mohanta <subhrodipmohanta@gmail.com>
2026-05-17 06:59:29 +00:00 · 2021-01-13 15:36:21 +08:00
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+package com.iluwatar.specialcase;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class MaintenanceLock {
+
+  private static final Logger LOGGER = LoggerFactory.getLogger(MaintenanceLock.class);
+
+  private static MaintenanceLock instance;
+  private boolean lock = true;
+
+  /**
+   * Get the instance of MaintenanceLock.
+   *
+   * @return singleton instance of MaintenanceLock
+   */
+  public static MaintenanceLock getInstance() {
+    if (instance == null) {
+      synchronized (MaintenanceLock.class) {
+        if (instance == null) {
+          instance = new MaintenanceLock();
+        }
+      }
+    }
+    return instance;
+  }
+
+  public boolean isLock() {
+    return lock;
+  }
+
+  public void setLock(boolean lock) {
+    this.lock = lock;
+    LOGGER.info("Maintenance lock is set to: " + lock);
+  }
+}