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/*
* Copyright (c) 2019 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 io.fd.jvpp.stats;
import io.fd.jvpp.VppConnection;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.logging.Level;
import java.util.logging.Logger;
import static io.fd.jvpp.NativeLibraryLoader.loadLibrary;
import static java.lang.String.format;
/**
* JNI based representation of a management connection to VPP.
*/
public final class VppStatsJNIConnection implements VppConnection {
private static final Logger LOG = Logger.getLogger(VppStatsJNIConnection.class.getName());
private StatsConnectionInfo connectionInfo;
private final String clientName;
private volatile boolean disconnected = false;
static {
final String libName = "libjvpp_stats_registry.so";
try {
loadLibrary(libName, VppStatsJNIConnection.class);
} catch (IOException e) {
LOG.log(Level.SEVERE, format("Can't find vpp jni library: %s", libName), e);
throw new ExceptionInInitializerError(e);
}
}
/**
* Create VPPStatsJNIConnection instance for client connecting to VPP.
*
* @param clientName client name instance to be used for communication. Single connection per clientName is
* allowed.
*/
public VppStatsJNIConnection(final String clientName) {
this.clientName = Objects.requireNonNull(clientName, "Null clientName");
}
/**
* Guarded by VppStatsJNIConnection.class
*/
private static final Map<String, VppStatsJNIConnection> connections = new HashMap<>();
/**
* Initiate VPP connection for current instance
* <p>
* Multiple instances are allowed since this class is not a singleton (VPP allows multiple management connections).
* <p>
* However only a single connection per clientName is allowed.
*
* @throws IOException in case the connection could not be established
*/
@Override
public void connect() throws IOException {
_connect();
}
private void _connect() throws IOException {
synchronized (VppStatsJNIConnection.class) {
if (connections.containsKey(clientName)) {
throw new IOException("Client " + clientName + " already connected");
}
connectionInfo = statsConnect(clientName);
if (connectionInfo.status != 0) {
throw new IOException("Connection returned error " + connectionInfo.status);
}
connections.put(clientName, this);
}
}
@Override
public final void checkActive() {
if (disconnected) {
throw new IllegalStateException("Disconnected client " + clientName);
}
}
@Override
public final synchronized void close() {
if (!disconnected) {
disconnected = true;
try {
statsDisconnect();
} finally {
synchronized (VppStatsJNIConnection.class) {
connections.remove(clientName);
}
}
}
}
public StatsConnectionInfo getStatsConnectionInfo() {
return connectionInfo;
}
/**
* VPP connection information used by plugins to reuse the connection.
*/
public static final class StatsConnectionInfo {
public final long queueAddress;
public final int clientIndex;
public final int status; // FIXME throw exception instead
public final int pid;
public StatsConnectionInfo(long queueAddress, int clientIndex, int status, int pid) {
this.queueAddress = queueAddress;
this.clientIndex = clientIndex;
this.status = status;
this.pid = pid;
}
}
private static native StatsConnectionInfo statsConnect(String clientName);
private static native void statsDisconnect();
}
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