[server] Compiling again, still lots of stubs

1 files changed, 84 insertions, 0 deletions

diff --git a/dozentenmodulserver/src/main/java/server/SessionManager.java b/dozentenmodulserver/src/main/java/server/SessionManager.java
new file mode 100644
index 00000000..75336de0
--- /dev/null
+++ b/dozentenmodulserver/src/main/java/server/SessionManager.java
@@ -0,0 +1,84 @@
+package server;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.log4j.Logger;
+import org.openslx.imagemaster.thrift.iface.UserInfo;
+import org.openslx.thrifthelper.ThriftManager;
+
+/**
+ * Manages user sessions. Mainly used to map tokens to users.
+ * 
+ */
+public class SessionManager {
+
+	private static final Logger LOGGER = Logger.getLogger(SessionManager.class);
+
+	private static class Entry {
+		private static final long SESSION_TIMEOUT = TimeUnit.DAYS.toMillis(1);
+		private final UserInfo user;
+		private long validUntil;
+
+		private Entry(UserInfo user) {
+			this.user = user;
+			this.validUntil = System.currentTimeMillis() + SESSION_TIMEOUT;
+		}
+
+		public void touch(long now) {
+			this.validUntil = now + SESSION_TIMEOUT;
+		}
+	}
+
+	// saves the current tokens and the mapped userdata, returning from the server
+	private static Map<String, Entry> tokenManager = new ConcurrentHashMap<>();
+
+	/**
+	 * Get the user corresponding to the given token. Returns null if the token
+	 * is not known, or the session already timed out.
+	 * 
+	 * @param token
+	 *            user's token
+	 * @return UserInfo for the matching user
+	 */
+	public static UserInfo get(String token) {
+		Entry e = tokenManager.get(token);
+		if (e != null) {
+			// User session already cached
+			final long now = System.currentTimeMillis();
+			if (e.validUntil < now) {
+				tokenManager.remove(token);
+				return getRemote(token);
+			}
+			e.touch(now);
+			return e.user;
+		}
+		return getRemote(token);
+	}
+
+	/**
+	 * Remove session matching the given token
+	 * 
+	 * @param token
+	 */
+	public static void remove(String token) {
+		tokenManager.remove(token);
+	}
+
+	private static UserInfo getRemote(String token) {
+		UserInfo ui = null;
+		try {
+			ui = ThriftManager.getMasterClient().getUserFromToken(token);
+		} catch (Exception e) {
+			LOGGER.warn("Could not reach master server to query for user token of a client!", e);
+		}
+		if (ui == null)
+			return null;
+		tokenManager.put(token, new Entry(ui));
+		return ui;
+	}
+
+	// TODO: Clean map of old entries periodically
+
+}