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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.sshd.common.io.nio2;
import java.io.IOException;
import java.net.SocketOption;
import java.net.SocketTimeoutException;
import java.net.StandardSocketOptions;
import java.nio.channels.AsynchronousChannelGroup;
import java.nio.channels.NetworkChannel;
import java.time.Duration;
import java.util.AbstractMap.SimpleImmutableEntry;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.sshd.common.Closeable;
import org.apache.sshd.common.Property;
import org.apache.sshd.common.PropertyResolver;
import org.apache.sshd.common.io.IoHandler;
import org.apache.sshd.common.io.IoService;
import org.apache.sshd.common.io.IoServiceEventListener;
import org.apache.sshd.common.io.IoSession;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.closeable.AbstractInnerCloseable;
import org.apache.sshd.core.CoreModuleProperties;
/**
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public abstract class Nio2Service extends AbstractInnerCloseable implements IoService {
// Note: order may be important so that's why we use a LinkedHashMap
public static final Map<Property<?>, SimpleImmutableEntry<SocketOption<?>, Object>> CONFIGURABLE_OPTIONS;
static {
Map<Property<?>, SimpleImmutableEntry<SocketOption<?>, Object>> map = new LinkedHashMap<>();
map.put(CoreModuleProperties.SOCKET_KEEPALIVE, new SimpleImmutableEntry<>(StandardSocketOptions.SO_KEEPALIVE, null));
map.put(CoreModuleProperties.SOCKET_LINGER, new SimpleImmutableEntry<>(StandardSocketOptions.SO_LINGER, null));
map.put(CoreModuleProperties.SOCKET_RCVBUF, new SimpleImmutableEntry<>(StandardSocketOptions.SO_RCVBUF, null));
map.put(CoreModuleProperties.SOCKET_REUSEADDR,
new SimpleImmutableEntry<>(StandardSocketOptions.SO_REUSEADDR, DEFAULT_REUSE_ADDRESS));
map.put(CoreModuleProperties.SOCKET_SNDBUF, new SimpleImmutableEntry<>(StandardSocketOptions.SO_SNDBUF, null));
map.put(CoreModuleProperties.TCP_NODELAY, new SimpleImmutableEntry<>(StandardSocketOptions.TCP_NODELAY, null));
CONFIGURABLE_OPTIONS = Collections.unmodifiableMap(map);
}
protected final Map<Long, IoSession> sessions;
protected final AtomicBoolean disposing = new AtomicBoolean();
protected final PropertyResolver propertyResolver;
private final IoHandler handler;
private final AsynchronousChannelGroup group;
private final ExecutorService executor;
private IoServiceEventListener eventListener;
protected Nio2Service(PropertyResolver propertyResolver, IoHandler handler, AsynchronousChannelGroup group,
ExecutorService resumeTasks) {
if (log.isTraceEnabled()) {
log.trace("Creating {}", getClass().getSimpleName());
}
this.propertyResolver = Objects.requireNonNull(propertyResolver, "No property resolver provided");
this.handler = Objects.requireNonNull(handler, "No I/O handler provided");
this.group = Objects.requireNonNull(group, "No async. channel group provided");
this.executor = Objects.requireNonNull(resumeTasks, "No executor for resuming suspended sessions provided");
this.sessions = new ConcurrentHashMap<>();
}
@Override
public IoServiceEventListener getIoServiceEventListener() {
return eventListener;
}
@Override
public void setIoServiceEventListener(IoServiceEventListener listener) {
eventListener = listener;
}
protected AsynchronousChannelGroup getChannelGroup() {
return group;
}
protected ExecutorService getExecutorService() {
return executor;
}
public IoHandler getIoHandler() {
return handler;
}
public void dispose() {
try {
if (disposing.getAndSet(true)) {
log.warn("dispose({}) already disposing", this);
}
Duration maxWait = Closeable.getMaxCloseWaitTime(propertyResolver);
boolean successful = close(true).await(maxWait);
if (!successful) {
throw new SocketTimeoutException("Failed to receive closure confirmation within " + maxWait);
}
} catch (IOException e) {
warn("dispose({}) {} while stopping service: {}",
this, e.getClass().getSimpleName(), e.getMessage(), e);
}
}
@Override
protected Closeable getInnerCloseable() {
return builder()
.parallel(toString(), sessions.values())
.build();
}
@Override
public Map<Long, IoSession> getManagedSessions() {
return Collections.unmodifiableMap(sessions);
}
public void sessionClosed(Nio2Session session) {
unmapSession(session.getId());
}
protected void unmapSession(Long sessionId) {
if (sessionId != null) {
IoSession ioSession = sessions.remove(sessionId);
if (log.isDebugEnabled()) {
log.debug("unmapSession(id={}): {}", sessionId, ioSession);
}
}
}
@SuppressWarnings("unchecked")
protected <S extends NetworkChannel> S setSocketOptions(S socket) throws IOException {
Collection<? extends SocketOption<?>> supported = socket.supportedOptions();
if (GenericUtils.isEmpty(supported)) {
return socket;
}
for (Map.Entry<Property<?>, ? extends Map.Entry<SocketOption<?>, ?>> ce : CONFIGURABLE_OPTIONS.entrySet()) {
Property<?> property = ce.getKey();
Map.Entry<SocketOption<?>, ?> defConfig = ce.getValue();
@SuppressWarnings("rawtypes")
SocketOption option = defConfig.getKey();
setOption(socket, property, option, defConfig.getValue());
}
return socket;
}
protected <T> boolean setOption(
NetworkChannel socket, Property<?> property, SocketOption<T> option, T defaultValue)
throws IOException {
String valStr = propertyResolver.getString(property.getName());
T val = defaultValue;
if (!GenericUtils.isEmpty(valStr)) {
Class<T> type = option.type();
if (type == Integer.class) {
val = type.cast(Integer.valueOf(valStr));
} else if (type == Boolean.class) {
val = type.cast(Boolean.valueOf(valStr));
} else {
throw new IllegalStateException("Unsupported socket option type (" + type + ") " + property + "=" + valStr);
}
}
if (val == null) {
return false;
}
Collection<? extends SocketOption<?>> supported = socket.supportedOptions();
if (GenericUtils.isEmpty(supported) || (!supported.contains(option))) {
if (log.isDebugEnabled()) {
log.debug("Unsupported socket option ({}) to set using {}={}", option, property, val);
}
return false;
}
try {
socket.setOption(option, val);
if (log.isDebugEnabled()) {
log.debug("setOption({})[{}] from property={}", option, val, property);
}
return true;
} catch (IOException | RuntimeException e) {
log.warn("setOption({}): unable to set socket option {} via {}={}: {}", socket, option, property, val,
e.toString());
return false;
}
}
}