如何使用嵌入式tomcat会话集群设置Spring Boot应用程序?
我想用嵌入式tomcat会话集群设置一个Spring Boot" title="Spring Boot">Spring Boot应用程序。
由于嵌入式tomcat没有server.xml
文件,因此我创建了TomcatEmbeddedServletContainerFactory并以编程方式设置集群配置。代码如下:
@Configurationpublic class TomcatConfig
{
@Bean
public EmbeddedServletContainerFactory servletContainerFactory()
{
return new TomcatEmbeddedServletContainerFactory()
{
@Override
protected TomcatEmbeddedServletContainer getTomcatEmbeddedServletContainer(
Tomcat tomcat)
{
configureCluster(tomcat);
return super.getTomcatEmbeddedServletContainer(tomcat);
}
private void configureCluster(Tomcat tomcat)
{
// static membership cluster
SimpleTcpCluster cluster = new SimpleTcpCluster();
cluster.setChannelStartOptions(3);
{
DeltaManager manager = new DeltaManager();
manager.setNotifyListenersOnReplication(true);
cluster.setManagerTemplate(manager);
}
{
GroupChannel channel = new GroupChannel();
{
NioReceiver receiver = new NioReceiver();
receiver.setPort(localClusterMemberPort);
channel.setChannelReceiver(receiver);
}
{
ReplicationTransmitter sender = new ReplicationTransmitter();
sender.setTransport(new PooledParallelSender());
channel.setChannelSender(sender);
}
channel.addInterceptor(new TcpPingInterceptor());
channel.addInterceptor(new TcpFailureDetector());
channel.addInterceptor(new MessageDispatch15Interceptor());
{
StaticMembershipInterceptor membership =
new StaticMembershipInterceptor();
String[] memberSpecs = clusterMembers.split(",", -1);
for (String spec : memberSpecs)
{
ClusterMemberDesc memberDesc = new ClusterMemberDesc(spec);
StaticMember member = new StaticMember();
member.setHost(memberDesc.address);
member.setPort(memberDesc.port);
member.setDomain("MyWebAppDomain");
member.setUniqueId(memberDesc.uniqueId);
membership.addStaticMember(member);
}
channel.addInterceptor(membership);
}
cluster.setChannel(channel);
}
cluster.addValve(new ReplicationValve());
cluster.addValve(new JvmRouteBinderValve());
cluster.addClusterListener(new ClusterSessionListener());
tomcat.getEngine().setCluster(cluster);
}
};
}
private static class ClusterMemberDesc
{
public String address;
public int port;
public String uniqueId;
public ClusterMemberDesc(String spec) throws IllegalArgumentException
{
String[] values = spec.split(":", -1);
if (values.length != 3)
throw new IllegalArgumentException("clusterMembers element " +
"format must be address:port:uniqueIndex");
address = values[0];
port = Integer.parseInt(values[1]);
int index = Integer.parseInt(values[2]);
if ((index < 0) || (index > 255))
throw new IllegalArgumentException("invalid unique index: must be >= 0 and < 256");
uniqueId = "{";
for (int i = 0; i < 16; i++, index++)
{
if (i != 0)
uniqueId += ',';
uniqueId += index % 256;
}
uniqueId += '}';
}
};
// This is for example. In fact these are read from application.properties
private int localClusterMemberPort = 9991;
private String clusterMembers = "111.222.333.444:9992:1";
}
我在以下环境中测试了代码:
- 单Windows PC
- 2个具有不同localClusterMemberPort和clusterMembers的Spring Boot应用程序实例
由于cookie没有考虑端口,因此包含JSESSIONID的cookie在两个实例之间共享。
启动实例时,tomcat群集似乎可以正常工作,因为两个实例的请求的JSESSIONID值相同。但是,当我使用第一个实例登录后向第二个实例发出请求时,第二个实例找不到HttpSession。它记录以下消息:
w.c.HttpSessionSecurityContextRepository : No HttpSession currently existsw.c.HttpSessionSecurityContextRepository : No SecurityContext was available from the HttpSession: null. A new one will be created.
显然,HttpSession没有被共享。但是,当第二个实例创建新会话时,第一个实例的登录信息将被清除,并且登录无效。
这是怎么回事 会话是共享的,但是HttpSession不是共享的?
顺便说一句,我读过<distributed />
必须web.xml
为应用程序使用tomcat会话集群指定标记。但是我不知道如何在Spring
Boot的no-xml环境中指定它。这是问题的原因吗?那么如何指定呢?
我搜索并找到了一些显示使用Redis进行聚类的文档。但是目前,我不想在配置中添加其他活动部件。在我的配置中,最大3〜4个节点。
回答:
关键是使上下文可分发,并设置管理器。
当我按如下所示修改问题的代码时,会话集群起作用了。
@Configurationpublic class TomcatConfig
{
@Bean
public EmbeddedServletContainerFactory servletContainerFactory()
{
TomcatEmbeddedServletContainerFactory factory = new TomcatEmbeddedServletContainerFactory()
{
...
};
factory.addContextCustomizers(new TomcatContextCustomizer()
{
@Override
public void customize(Context context)
{
context.setManager(new DeltaManager());
context.setDistributable(true);
}
});
return factory;
}
...
}
对于Spring Boot 1.2.4,不需要context.setManager()。但是对于Spring Boot to
1.3.0,如果未调用context.setManager(),集群将失败并显示以下日志。
2015-11-18 19:59:42.882 WARN 9764 --- [ost-startStop-1] o.a.catalina.ha.tcp.SimpleTcpCluster : Manager [org.apache.catalina.session.StandardManager[]] does not implement ClusterManager, addition to cluster has been aborted.
我对此版本依赖性有些担心。因此,我为此打开了一个问题。
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