1 files changed, 144 insertions, 0 deletions
diff --git a/vpp-api/java/jvpp/org/openvpp/jvpp/VppJNIConnection.java b/vpp-api/java/jvpp/org/openvpp/jvpp/VppJNIConnection.java
new file mode 100644
index 00000000..9e07cc76
--- /dev/null
+++ b/vpp-api/java/jvpp/org/openvpp/jvpp/VppJNIConnection.java
@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.openvpp.jvpp;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.nio.file.attribute.PosixFilePermission;
+import java.nio.file.attribute.PosixFilePermissions;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import java.util.logging.Logger;
+import org.openvpp.jvpp.callback.JVppCallback;
+
+/**
+ * JNI based representation of a management connection to VPP
+ */
+public final class VppJNIConnection implements VppConnection {
+    private final static Logger LOG = Logger.getLogger(VppJNIConnection.class.getName());
+    private static final String LIBNAME = "libjvpp.so.0.0.0";
+
+    static {
+        try {
+            loadLibrary();
+        } catch (Exception e) {
+            LOG.severe("Can't find vpp jni library: " + LIBNAME);
+            throw new ExceptionInInitializerError(e);
+        }
+    }
+
+    private static void loadStream(final InputStream is) throws IOException {
+        final Set<PosixFilePermission> perms = PosixFilePermissions.fromString("rwxr-x---");
+        final Path p = Files.createTempFile(LIBNAME, null, PosixFilePermissions.asFileAttribute(perms));
+        try {
+            Files.copy(is, p, StandardCopyOption.REPLACE_EXISTING);
+
+            try {
+                Runtime.getRuntime().load(p.toString());
+            } catch (UnsatisfiedLinkError e) {
+                throw new IOException("Failed to load library " + p, e);
+            }
+        } finally {
+            try {
+                Files.deleteIfExists(p);
+            } catch (IOException e) {
+            }
+        }
+    }
+
+    private static void loadLibrary() throws IOException {
+        try (final InputStream is = VppJNIConnection.class.getResourceAsStream('/' + LIBNAME)) {
+            if (is == null) {
+                throw new IOException("Failed to open library resource " + LIBNAME);
+            }
+            loadStream(is);
+        }
+    }
+
+    private final String clientName;
+    private volatile boolean disconnected = false;
+
+    private VppJNIConnection(final String clientName) {
+        if (clientName == null) {
+            throw new NullPointerException("Null clientName");
+        }
+        this.clientName = clientName;
+    }
+
+    /**
+     * Guarded by VppJNIConnection.class
+     */
+    private static final Map<String, VppJNIConnection> connections = new HashMap<>();
+
+    /**
+     * Create a new Vpp connection identified by clientName parameter.
+     *
+     * Multiple instances are allowed since this class is not a singleton
+     * (VPP allows multiple management connections).
+     *
+     * However only a single connection per clientName is allowed.
+     *
+     * @param clientName identifier of vpp connection
+     * @param callback global callback to receive response calls from vpp
+     *
+     * @return new Vpp connection
+     * @throws IOException in case the connection could not be established, or there already is a connection with the same name
+     */
+    public static VppJNIConnection create(final String clientName, final JVppCallback callback) throws IOException {
+        synchronized (VppJNIConnection.class) {
+            if(connections.containsKey(clientName)) {
+                throw new IOException("Client " + clientName + " already connected");
+            }
+
+            final VppJNIConnection vppJNIConnection = new VppJNIConnection(clientName);
+            final int ret = clientConnect(clientName, callback);
+            if (ret != 0) {
+                throw new IOException("Connection returned error " + ret);
+            }
+            connections.put(clientName, vppJNIConnection);
+            return vppJNIConnection;
+        }
+    }
+
+    @Override
+    public final void checkActive() {
+        if (disconnected) {
+            throw new IllegalStateException("Disconnected client " + clientName);
+        }
+    }
+
+    @Override
+    public synchronized final void close() {
+        if (!disconnected) {
+            disconnected = true;
+            try {
+                clientDisconnect();
+            } finally {
+                synchronized (VppJNIConnection.class) {
+                    connections.remove(clientName);
+                }
+            }
+        }
+    }
+
+    private static native int clientConnect(String clientName, JVppCallback callback);
+    private static native void clientDisconnect();
+}