这篇文章主要讲解了“spring cloud中CachingSpringLoadBalancerFactory的作用是什么”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“spring cloud中CachingSpringLoadBalancerFactory的作用是什么”吧！
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本文主要研究一下spring cloud的CachingSpringLoadBalancerFactory
spring-cloud-openfeign-core-2.2.0.M1-sources.jar!/org/springframework/cloud/openfeign/ribbon/CachingSpringLoadBalancerFactory.java
public class CachingSpringLoadBalancerFactory {
protected final SpringClientFactory factory;
protected LoadBalancedRetryFactory loadBalancedRetryFactory = null;
private volatile Map cache = new ConcurrentReferenceHashMap<>();
public CachingSpringLoadBalancerFactory(SpringClientFactory factory) {
this.factory = factory;
}
public CachingSpringLoadBalancerFactory(SpringClientFactory factory,
LoadBalancedRetryFactory loadBalancedRetryPolicyFactory) {
this.factory = factory;
this.loadBalancedRetryFactory = loadBalancedRetryPolicyFactory;
}
public FeignLoadBalancer create(String clientName) {
FeignLoadBalancer client = this.cache.get(clientName);
if (client != null) {
return client;
}
IClientConfig config = this.factory.getClientConfig(clientName);
ILoadBalancer lb = this.factory.getLoadBalancer(clientName);
ServerIntrospector serverIntrospector = this.factory.getInstance(clientName,
ServerIntrospector.class);
client = this.loadBalancedRetryFactory != null
? new RetryableFeignLoadBalancer(lb, config, serverIntrospector,
this.loadBalancedRetryFactory)
: new FeignLoadBalancer(lb, config, serverIntrospector);
this.cache.put(clientName, client);
return client;
}
} CachingSpringLoadBalancerFactory的构造器接收SpringClientFactory、LoadBalancedRetryFactory；它提供了create方法用于创建FeignLoadBalancer；其create方法使用ConcurrentReferenceHashMap来缓存每个client对应的FeignLoadBalancer
spring-cloud-openfeign-core-2.2.0.M1-sources.jar!/org/springframework/cloud/openfeign/ribbon/LoadBalancerFeignClient.java
public class LoadBalancerFeignClient implements Client {
static final Request.Options DEFAULT_OPTIONS = new Request.Options();
private final Client delegate;
private CachingSpringLoadBalancerFactory lbClientFactory;
private SpringClientFactory clientFactory;
public LoadBalancerFeignClient(Client delegate,
CachingSpringLoadBalancerFactory lbClientFactory,
SpringClientFactory clientFactory) {
this.delegate = delegate;
this.lbClientFactory = lbClientFactory;
this.clientFactory = clientFactory;
}
static URI cleanUrl(String originalUrl, String host) {
String newUrl = originalUrl;
if (originalUrl.startsWith("https://")) {
newUrl = originalUrl.substring(0, 8)
+ originalUrl.substring(8 + host.length());
}
else if (originalUrl.startsWith("http")) {
newUrl = originalUrl.substring(0, 7)
+ originalUrl.substring(7 + host.length());
}
StringBuffer buffer = new StringBuffer(newUrl);
if ((newUrl.startsWith("https://") && newUrl.length() == 8)
|| (newUrl.startsWith("http://") && newUrl.length() == 7)) {
buffer.append("/");
}
return URI.create(buffer.toString());
}
@Override
public Response execute(Request request, Request.Options options) throws IOException {
try {
URI asUri = URI.create(request.url());
String clientName = asUri.getHost();
URI uriWithoutHost = cleanUrl(request.url(), clientName);
FeignLoadBalancer.RibbonRequest ribbonRequest = new FeignLoadBalancer.RibbonRequest(
this.delegate, request, uriWithoutHost);
IClientConfig requestConfig = getClientConfig(options, clientName);
return lbClient(clientName)
.executeWithLoadBalancer(ribbonRequest, requestConfig).toResponse();
}
catch (ClientException e) {
IOException io = findIOException(e);
if (io != null) {
throw io;
}
throw new RuntimeException(e);
}
}
IClientConfig getClientConfig(Request.Options options, String clientName) {
IClientConfig requestConfig;
if (options == DEFAULT_OPTIONS) {
requestConfig = this.clientFactory.getClientConfig(clientName);
}
else {
requestConfig = new FeignOptionsClientConfig(options);
}
return requestConfig;
}
protected IOException findIOException(Throwable t) {
if (t == null) {
return null;
}
if (t instanceof IOException) {
return (IOException) t;
}
return findIOException(t.getCause());
}
public Client getDelegate() {
return this.delegate;
}
private FeignLoadBalancer lbClient(String clientName) {
return this.lbClientFactory.create(clientName);
}
static class FeignOptionsClientConfig extends DefaultClientConfigImpl {
FeignOptionsClientConfig(Request.Options options) {
setProperty(CommonClientConfigKey.ConnectTimeout,
options.connectTimeoutMillis());
setProperty(CommonClientConfigKey.ReadTimeout, options.readTimeoutMillis());
}
@Override
public void loadProperties(String clientName) {
}
@Override
public void loadDefaultValues() {
}
}
}LoadBalancerFeignClient的lbClient方法使用CachingSpringLoadBalancerFactory的create方法来创建FeignLoadBalancer；而execute方法则调用了lbClient方法来获取FeignLoadBalancer
CachingSpringLoadBalancerFactory的构造器接收SpringClientFactory、LoadBalancedRetryFactory；它提供了create方法用于创建FeignLoadBalancer；其create方法使用ConcurrentReferenceHashMap来缓存每个client对应的FeignLoadBalancer
感谢各位的阅读，以上就是“spring cloud中CachingSpringLoadBalancerFactory的作用是什么”的内容了，经过本文的学习后，相信大家对spring cloud中CachingSpringLoadBalancerFactory的作用是什么这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是创新互联，小编将为大家推送更多相关知识点的文章，欢迎关注！
