From 3bbc86a58d68069c6eb95ec17b02daa4ca75ec7f Mon Sep 17 00:00:00 2001
From: Niki Roo <niki@nikiroo.be>
Date: Sat, 2 Dec 2017 15:02:48 +0100
Subject: [PATCH] RemoteLibrary: new isOnline() method

---
 .../nikiroo/fanfix/library/RemoteLibrary.java | 30 +++++++++++++++++++
 .../fanfix/library/RemoteLibraryServer.java   |  5 +++-
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/src/be/nikiroo/fanfix/library/RemoteLibrary.java b/src/be/nikiroo/fanfix/library/RemoteLibrary.java
index ea155eb..e51de45 100644
--- a/src/be/nikiroo/fanfix/library/RemoteLibrary.java
+++ b/src/be/nikiroo/fanfix/library/RemoteLibrary.java
@@ -224,6 +224,36 @@ public class RemoteLibrary extends BasicLibrary {
 				"Operation not supportorted on remote Libraries");
 	}
 
+	/**
+	 * Check if this {@link RemoteLibraryServer} is able to connect and identify
+	 * to the remote server.
+	 * 
+	 * @return TRUE if it is online
+	 */
+	public boolean isOnline() {
+		final Boolean[] result = new Boolean[1];
+
+		result[0] = false;
+		try {
+			new ConnectActionClientObject(host, port, true) {
+				@Override
+				public void action(Version serverVersion) throws Exception {
+					Object rep = send(new Object[] { key, "PING" });
+					result[0] = "PONG".equals(rep);
+				}
+
+				@Override
+				protected void onError(Exception e) {
+					Instance.getTraceHandler().error(e);
+				}
+			}.connect();
+		} catch (Exception e) {
+			Instance.getTraceHandler().error(e);
+		}
+
+		return result[0];
+	}
+
 	@Override
 	protected List<MetaData> getMetas(Progress pg) {
 		final Progress pgF = pg;
diff --git a/src/be/nikiroo/fanfix/library/RemoteLibraryServer.java b/src/be/nikiroo/fanfix/library/RemoteLibraryServer.java
index 40386ec..b95c50f 100644
--- a/src/be/nikiroo/fanfix/library/RemoteLibraryServer.java
+++ b/src/be/nikiroo/fanfix/library/RemoteLibraryServer.java
@@ -25,6 +25,7 @@ import be.nikiroo.utils.serial.server.ServerObject;
  * The key is always a String, the commands are also Strings; the parameters
  * vary depending upon the command.
  * <ul>
+ * <li>[key] PING: will return PONG if the key is accepted</li>
  * <li>[key] GET_METADATA *: will return the metadata of all the stories in the
  * library</li>
  * <li>[key] GET_STORY [luid]: will return the given story if it exists (or NULL
@@ -93,7 +94,9 @@ public class RemoteLibraryServer extends ServerObject {
 			return null;
 		}
 
-		if ("GET_METADATA".equals(command)) {
+		if ("PING".equals(command)) {
+			return "PONG";
+		} else if ("GET_METADATA".equals(command)) {
 			if (args[0].equals("*")) {
 				List<MetaData> metas = Instance.getLibrary().getMetas(
 						createPgForwarder(action));
-- 
2.27.0