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/*
* 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.Objects;
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) {
this.clientName = Objects.requireNonNull(clientName,"Null 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();
}
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