real application ids

Change-Id: Ia24f1de6ccff614769727ab261002520dfd8506f
diff --git a/core/net/src/main/java/org/onlab/onos/impl/CoreManager.java b/core/net/src/main/java/org/onlab/onos/impl/CoreManager.java
new file mode 100644
index 0000000..29a8438
--- /dev/null
+++ b/core/net/src/main/java/org/onlab/onos/impl/CoreManager.java
@@ -0,0 +1,56 @@
+package org.onlab.onos.impl;
+
+import java.io.File;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Service;
+import org.onlab.onos.ApplicationId;
+import org.onlab.onos.CoreService;
+import org.onlab.onos.Version;
+import org.onlab.util.Tools;
+
+
+/**
+ * Core service implementation.
+ */
+@Component
+@Service
+public class CoreManager implements CoreService {
+
+    private static final AtomicInteger ID_DISPENSER = new AtomicInteger(1);
+    private static final File VERSION_FILE = new File("../VERSION");
+    private static Version version = Version.version("1.0.0-SNAPSHOT");
+
+    private final Map<Short, DefaultApplicationId> ids = new ConcurrentHashMap<>();
+
+    // TODO: work in progress
+
+    @Activate
+    public void activate() {
+        List<String> versionLines = Tools.slurp(VERSION_FILE);
+        if (versionLines != null && !versionLines.isEmpty()) {
+            version = Version.version(versionLines.get(0));
+        }
+    }
+
+    @Override
+    public Version version() {
+        return version;
+    }
+
+    @Override
+    public ApplicationId getAppId(Short id) {
+        return ids.get(id);
+    }
+
+    @Override
+    public ApplicationId registerApplication(String name) {
+        return new DefaultApplicationId((short) ID_DISPENSER.getAndIncrement(), name);
+    }
+
+}
diff --git a/core/net/src/main/java/org/onlab/onos/impl/DefaultApplicationId.java b/core/net/src/main/java/org/onlab/onos/impl/DefaultApplicationId.java
new file mode 100644
index 0000000..04012db
--- /dev/null
+++ b/core/net/src/main/java/org/onlab/onos/impl/DefaultApplicationId.java
@@ -0,0 +1,52 @@
+package org.onlab.onos.impl;
+
+import java.util.Objects;
+
+import org.onlab.onos.ApplicationId;
+
+/**
+ * Application id generator class.
+ */
+public class DefaultApplicationId implements ApplicationId {
+
+
+    private final short id;
+    private final String name;
+
+
+    // Ban public construction
+    protected DefaultApplicationId(Short id, String identifier) {
+        this.id = id;
+        this.name = identifier;
+    }
+
+    @Override
+    public short id() {
+        return id;
+    }
+
+    @Override
+    public String name() {
+        return name;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (!(obj instanceof DefaultApplicationId)) {
+            return false;
+        }
+        DefaultApplicationId other = (DefaultApplicationId) obj;
+        return Objects.equals(this.id, other.id);
+    }
+}
diff --git a/core/net/src/main/java/org/onlab/onos/impl/package-info.java b/core/net/src/main/java/org/onlab/onos/impl/package-info.java
new file mode 100644
index 0000000..bbe539f
--- /dev/null
+++ b/core/net/src/main/java/org/onlab/onos/impl/package-info.java
@@ -0,0 +1,4 @@
+/**
+ *
+ */
+package org.onlab.onos.impl;
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