PeerManager: Add countPeersByCapability()

router/java/src/net/i2p/router/PeerManagerFacade.java

@@ -21,6 +21,7 @@ import net.i2p.data.Hash;
  */
 public interface PeerManagerFacade extends Service {
     public Set<Hash> getPeersByCapability(char capability);
+    public int countPeersByCapability(char capability);
     public void setCapabilities(Hash peer, String caps);
     public void removeCapabilities(Hash peer);
     public Hash selectRandomByCapability(char capability);

router/java/src/net/i2p/router/dummy/DummyPeerManagerFacade.java

@@ -27,6 +27,7 @@ public class DummyPeerManagerFacade implements PeerManagerFacade {
     public void restart() {}
     public void renderStatusHTML(Writer out) { }    
     public Set<Hash> getPeersByCapability(char capability) { return null; }
+    public int countPeersByCapability(char capability) { return 0; }
     public void setCapabilities(Hash peer, String caps) {}
     public void removeCapabilities(Hash peer) {}
     public Hash selectRandomByCapability(char capability) { return null; }

router/java/src/net/i2p/router/peermanager/PeerManager.java

@@ -354,4 +354,16 @@ class PeerManager {
                 return Collections.unmodifiableSet(peers);
             return Collections.emptySet();
     }
+
+    /**
+     *  @param capability case-insensitive
+     *  @return how many
+     *  @since 0.9.45
+     */
+    public int countPeersByCapability(char capability) { 
+            Set<Hash> peers = locked_getPeers(capability);
+            if (peers != null)
+                return peers.size();
+            return 0;
+    }
 }

router/java/src/net/i2p/router/peermanager/PeerManagerFacadeImpl.java

@@ -89,6 +89,16 @@ public class PeerManagerFacadeImpl implements PeerManagerFacade {
         return _manager.getPeersByCapability(capability); 
     }
 
+    /**
+     *  @param capability case-insensitive
+     *  @return how many
+     *  @since 0.9.45
+     */
+    public int countPeersByCapability(char capability) { 
+        if (_manager == null) return 0;
+        return _manager.countPeersByCapability(capability); 
+    }
+
     /** @deprecated moved to routerconsole */
     @Deprecated
     public void renderStatusHTML(Writer out) throws IOException {