当使用Hazelcast进行Spring-Session集群时,可能会出现ViewScoped bean(视图作用域bean)的意外行为。这是因为Hazelcast默认将所有对象都序列化并存储在集群中,而视图作用域bean无法被序列化。
要解决这个问题,可以通过配置Hazelcast,将视图作用域bean排除在序列化之外。以下是一个示例代码,展示如何配置Hazelcast以解决此问题:
首先,在Spring Boot的配置文件application.properties中添加以下配置:
# 使用Hazelcast作为Spring-Session的集群方案
spring.session.store-type=hazelcast
# 配置Hazelcast的序列化
hazelcast.serialization.value.serializer=com.hazelcast.nio.serialization.PassthroughSerializer
然后,创建一个自定义的Hazelcast的序列化器,在其中排除视图作用域bean。例如,创建一个名为"PassThroughSerializer"的类:
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.StreamSerializer;
import java.io.IOException;
public class PassthroughSerializer implements StreamSerializer<Object> {
@Override
public void write(ObjectDataOutput out, Object object) throws IOException {
// 排除视图作用域bean的序列化
if (!(object instanceof ViewScopedBean)) {
out.writeObject(object);
}
}
@Override
public Object read(ObjectDataInput in) throws IOException {
return in.readObject();
}
@Override
public int getTypeId() {
return 1;
}
@Override
public void destroy() {
}
}
最后,在Spring Boot的配置类中添加以下代码,将自定义的序列化器添加到Hazelcast的配置中:
import org.springframework.context.annotation.Configuration;
import org.springframework.session.hazelcast.config.annotation.web.http.EnableHazelcastHttpSession;
import org.springframework.session.web.context.AbstractHttpSessionApplicationInitializer;
@Configuration
@EnableHazelcastHttpSession
public class HazelcastSessionConfig extends AbstractHttpSessionApplicationInitializer {
public HazelcastSessionConfig() {
super(HazelcastSessionConfig.class);
}
@Bean
public Config hazelcastConfig() {
Config config = new Config();
config.getSerializationConfig().addSerializerConfig(
new SerializerConfig().setTypeClass(Object.class).setImplementation(new PassthroughSerializer()));
return config;
}
}
通过以上配置,Hazelcast将不再尝试序列化视图作用域bean,并且可以正常使用Spring-Session集群。