Begin implementing discovery service.

3 files changed, 57 insertions, 0 deletions

diff --git a/discovery/src/main/java/com/orbekk/same/discovery/DiscoveryService.java b/discovery/src/main/java/com/orbekk/same/discovery/DiscoveryService.java
new file mode 100644
index 0000000..04fdab0
--- /dev/null
+++ b/discovery/src/main/java/com/orbekk/same/discovery/DiscoveryService.java
@@ -0,0 +1,22 @@
+package com.orbekk.same.discovery;
+
+import java.util.List;
+
+/**
+ * Maintains a registry of available networks.
+ * 
+ * The discovery service is only meant to be used for debugging.
+ */
+public interface DiscoveryService {
+    /**
+     * Returns a list of network names and master urls interleaved, i.e.,
+     * 
+     *   [NetworkName1, MasterUrl1, ...]
+     */
+    List<String> getNetworks() throws Exception;
+    
+    /**
+     * Register a network.
+     */
+    void registerNetwork(String networkName, String masterUrl) throws Exception;
+}
diff --git a/discovery/src/main/java/com/orbekk/same/discovery/DiscoveryServiceImpl.java b/discovery/src/main/java/com/orbekk/same/discovery/DiscoveryServiceImpl.java
new file mode 100644
index 0000000..f568213
--- /dev/null
+++ b/discovery/src/main/java/com/orbekk/same/discovery/DiscoveryServiceImpl.java
@@ -0,0 +1,5 @@
+package com.orbekk.same.discovery;
+
+public class DiscoveryServiceImpl {
+    
+}
diff --git a/discovery/src/main/java/com/orbekk/same/discovery/NetworkEntry.java b/discovery/src/main/java/com/orbekk/same/discovery/NetworkEntry.java
new file mode 100644
index 0000000..11c7f90
--- /dev/null
+++ b/discovery/src/main/java/com/orbekk/same/discovery/NetworkEntry.java
@@ -0,0 +1,30 @@
+package com.orbekk.same.discovery;
+
+public class NetworkEntry {
+    public String networkName;
+    public String masterUrl;
+    private long lastRegisteredMillis = -1;
+    
+    public NetworkEntry(String networkName, String masterUrl) {
+        this.networkName = networkName;
+        this.masterUrl = masterUrl;
+    }
+
+    public void register(long registeredTime) {
+        lastRegisteredMillis = registeredTime;
+    }
+    
+    public boolean hasExpired(long latestValidTimeMillis) {
+        return lastRegisteredMillis < latestValidTimeMillis;
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (other instanceof NetworkEntry) {
+            NetworkEntry otherEntry = (NetworkEntry)other;
+            return networkName.equals(otherEntry.networkName) &&
+                    masterUrl.equals(otherEntry.masterUrl);
+        }
+        return false;
+    }
+}