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rosnode kill support (shut down the node)#291

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rosnode kill support (shut down the node) #291

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2 changes: 1 addition & 1 deletion rosjava/src/main/java/org/ros/internal/node/DefaultNode.java
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Original file line numberDiff line numberDiff line change
Expand Up@@ -146,7 +146,7 @@ public DefaultNode(NodeConfiguration nodeConfiguration, Collection<NodeListener>
nodeConfiguration.getTcpRosAdvertiseAddress(),
nodeConfiguration.getXmlRpcBindAddress(),
nodeConfiguration.getXmlRpcAdvertiseAddress(), masterClient, topicParticipantManager,
serviceManager, parameterManager, scheduledExecutorService);
serviceManager, parameterManager, scheduledExecutorService, this);
slaveServer.start();

NodeIdentifier nodeIdentifier = slaveServer.toNodeIdentifier();
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16 changes: 15 additions & 1 deletion rosjava/src/main/java/org/ros/internal/node/server/SlaveServer.java
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Expand Up@@ -20,6 +20,7 @@

import org.ros.address.AdvertiseAddress;
import org.ros.address.BindAddress;
import org.ros.internal.node.DefaultNode;
import org.ros.internal.node.client.MasterClient;
import org.ros.internal.node.parameter.ParameterManager;
import org.ros.internal.node.service.ServiceManager;
Expand DownExpand Up@@ -52,12 +53,15 @@ public class SlaveServer extends XmlRpcServer {
private final TopicParticipantManager topicParticipantManager;
private final ParameterManager parameterManager;
private final TcpRosServer tcpRosServer;
private final DefaultNode defaultNode;

@jubeirajubeiraMar 28, 2019

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I'd suggest changing to Node instead of tying this to a particular implementation.
As we only need the shutdown method, we can use the base interface instead.

private boolean shutdownStarted;

public SlaveServer(GraphName nodeName, BindAddress tcpRosBindAddress,
AdvertiseAddress tcpRosAdvertiseAddress, BindAddress xmlRpcBindAddress,
AdvertiseAddress xmlRpcAdvertiseAddress, MasterClient master,
TopicParticipantManager topicParticipantManager, ServiceManager serviceManager,
ParameterManager parameterManager, ScheduledExecutorService executorService) {
ParameterManager parameterManager, ScheduledExecutorService executorService,
DefaultNode defaultNode) {
super(xmlRpcBindAddress, xmlRpcAdvertiseAddress);
this.nodeName = nodeName;
this.masterClient = master;
Expand All@@ -66,6 +70,7 @@ public SlaveServer(GraphName nodeName, BindAddress tcpRosBindAddress,
this.tcpRosServer =
new TcpRosServer(tcpRosBindAddress, tcpRosAdvertiseAddress, topicParticipantManager,
serviceManager, executorService);
this.defaultNode = defaultNode;
}

public AdvertiseAddress getTcpRosAdvertiseAddress() {
Expand All@@ -81,13 +86,22 @@ public void start() {
super.start(org.ros.internal.node.xmlrpc.SlaveXmlRpcEndpointImpl.class,
new SlaveXmlRpcEndpointImpl(this));
tcpRosServer.start();
shutdownStarted = false;
}

// TODO(damonkohler): This should also shut down the Node.

@jubeirajubeiraMar 28, 2019

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@Override
public void shutdown() {
// prevent recursive call of this method
if (shutdownStarted) {
return;
}
shutdownStarted = true;

@jubeirajubeiraMar 28, 2019

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About thread safety:
if shutdown is called a second time after the if statement is processed but before shutdownStarted is set to true, it will be called twice.
To be completely sure, I'd suggest placing all the code in both shutdown and start in a synchronized block using a dummy object as the lock. E.g.:

// In the constructor:shutdownLock = newObject();
// Then:@Overridepublicvoidshutdown() {
synchronized(shutdownLock) {
// current code goes here
}
}

And the same for start.

super.shutdown();
tcpRosServer.shutdown();
if (defaultNode != null) {
defaultNode.shutdown();
}
}

public List<Object> getBusStats(String callerId) {
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2 changes: 1 addition & 1 deletion rosjava/src/test/java/org/ros/internal/node/MasterSlaveIntegrationTest.java
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Expand Up@@ -62,7 +62,7 @@ public void setUp() {
new SlaveServer(GraphName.of("/foo"), BindAddress.newPrivate(),
AdvertiseAddress.newPrivate(), BindAddress.newPrivate(), AdvertiseAddress.newPrivate(),
masterClient, topicParticipantManager, serviceManager, parameterManager,
executorService);
executorService, null);
slaveServer.start();
slaveClient = new SlaveClient(GraphName.of("/bar"), slaveServer.getUri());
}
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