ONOS- 2946 Adding ability to view existing packet intercept requests and packet processors.

Change-Id: Id0d82fb4a19506ec607a71856dbf0c33c8e51baf
diff --git a/core/api/src/main/java/org/onosproject/net/packet/PacketProcessor.java b/core/api/src/main/java/org/onosproject/net/packet/PacketProcessor.java
index e700d62..0eba1b4 100644
--- a/core/api/src/main/java/org/onosproject/net/packet/PacketProcessor.java
+++ b/core/api/src/main/java/org/onosproject/net/packet/PacketProcessor.java
@@ -24,7 +24,7 @@
 
     int ADVISOR_MAX = Integer.MAX_VALUE / 3;
     int DIRECTOR_MAX = (Integer.MAX_VALUE / 3) * 2;
-    static final int OBSERVER_MAX = Integer.MAX_VALUE;
+    int OBSERVER_MAX = Integer.MAX_VALUE;
 
     /**
      * Returns a priority in the ADVISOR range, where processors can take early action and
@@ -38,7 +38,7 @@
     static int advisor(int priority) {
         int overallPriority = priority + 1;
         checkArgument(overallPriority > 0 && overallPriority <= ADVISOR_MAX,
-                "Priority not within ADVISOR range");
+                      "Priority not within ADVISOR range");
         return overallPriority;
     }
 
@@ -53,7 +53,7 @@
     static int director(int priority) {
         int overallPriority = ADVISOR_MAX + priority + 1;
         checkArgument(overallPriority > ADVISOR_MAX && overallPriority <= DIRECTOR_MAX,
-                "Priority not within DIRECTOR range");
+                      "Priority not within DIRECTOR range");
         return overallPriority;
     }
 
@@ -68,8 +68,8 @@
      */
     static int observer(int priority) {
         int overallPriority = DIRECTOR_MAX + priority + 1;
-        checkArgument(overallPriority > DIRECTOR_MAX && overallPriority <= OBSERVER_MAX,
-                "Priority not within OBSERVER range");
+        checkArgument(overallPriority > DIRECTOR_MAX,
+                      "Priority not within OBSERVER range");
         return overallPriority;
     }
 
diff --git a/core/api/src/main/java/org/onosproject/net/packet/PacketService.java b/core/api/src/main/java/org/onosproject/net/packet/PacketService.java
index 06c416e..98f4d8e 100644
--- a/core/api/src/main/java/org/onosproject/net/packet/PacketService.java
+++ b/core/api/src/main/java/org/onosproject/net/packet/PacketService.java
@@ -15,9 +15,13 @@
  */
 package org.onosproject.net.packet;
 
+import com.google.common.annotations.Beta;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.net.flow.TrafficSelector;
 
+import java.util.List;
+import java.util.Map;
+
 /**
  * Service for intercepting data plane packets and for emitting synthetic
  * outbound packets.
@@ -48,6 +52,15 @@
     void removeProcessor(PacketProcessor processor);
 
     /**
+     * Returns priority bindings of all registered packet processors.
+     *
+     * @return list of existing packet processors
+     */
+    @Beta
+    // TODO: Consider returning list of PacketProcessorEntry with processor, priority and stats
+    Map<Integer, PacketProcessor> getProcessors();
+
+    /**
      * Requests that packets matching the given selector are punted from the
      * dataplane to the controller.
      *
@@ -70,6 +83,13 @@
                        ApplicationId appId);
 
     /**
+     * Returns list of all existing requests ordered by priority.
+     *
+     * @return list of existing packet requests
+     */
+    List<PacketRequest> getRequests();
+
+    /**
      * Emits the specified outbound packet onto the network.
      *
      * @param packet outbound packet
diff --git a/core/api/src/main/java/org/onosproject/net/packet/PacketStore.java b/core/api/src/main/java/org/onosproject/net/packet/PacketStore.java
index ff45cc0..97f7cb5 100644
--- a/core/api/src/main/java/org/onosproject/net/packet/PacketStore.java
+++ b/core/api/src/main/java/org/onosproject/net/packet/PacketStore.java
@@ -17,7 +17,7 @@
 
 import org.onosproject.store.Store;
 
-import java.util.Set;
+import java.util.List;
 
 /**
  * Manages routing of outbound packets.
@@ -52,8 +52,8 @@
     /**
      * Obtains all existing requests in the system.
      *
-     * @return a set of packet requests
+     * @return list of packet requests in order of priority
      */
-    Set<PacketRequest> existingRequests();
+    List<PacketRequest> existingRequests();
 
 }
diff --git a/core/api/src/test/java/org/onosproject/net/packet/PacketServiceAdapter.java b/core/api/src/test/java/org/onosproject/net/packet/PacketServiceAdapter.java
index afe936b..c438659 100644
--- a/core/api/src/test/java/org/onosproject/net/packet/PacketServiceAdapter.java
+++ b/core/api/src/test/java/org/onosproject/net/packet/PacketServiceAdapter.java
@@ -18,6 +18,9 @@
 import org.onosproject.core.ApplicationId;
 import org.onosproject.net.flow.TrafficSelector;
 
+import java.util.List;
+import java.util.Map;
+
 /**
  * Test adapter for packet service.
  */
@@ -31,6 +34,16 @@
     }
 
     @Override
+    public Map<Integer, PacketProcessor> getProcessors() {
+        return null;
+    }
+
+    @Override
+    public List<PacketRequest> getRequests() {
+        return null;
+    }
+
+    @Override
     public void requestPackets(TrafficSelector selector, PacketPriority priority, ApplicationId appId) {
     }