How to provide new rest-template for every request to int-http:outbound-gateway? - spring-integration

Question

I am facing issue with the int-http:outbound-gateway when I am passing a rest-template which holds the basic credentials at the initial time. But, if any one changes credentials in database, rest-template cannot get those updated credential dynamically.
My code,
<int-http:outbound-gateway id="OutboundGateway"
request-channel="sendDataToContentType"
url="http://localhost:8080"
expected-response-type="java.lang.String"
rest-template="restTemplate"/>
<bean id="httpComponentsMessageSender" class="org.springframework.ws.transport.http.HttpComponentsMessageSender">
<property name="credentials">
<bean class="org.apache.http.auth.UsernamePasswordCredentials">
<constructor-arg value="${fromDatabase.userName}"/>
<constructor-arg value="${fromDatabase.password}"/>
</bean>
</property>
<bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
<constructor-arg>
<bean class="org.springframework.http.client.HttpComponentsClientHttpRequestFactory">
<property name="httpClient" value="#{httpComponentsMessageSender.httpClient}"/>
</bean>
</constructor-arg>
Is there any solution for this?

Answer 1

You don't need to do anything with the rest-template. There is need really just update the credentials on the underlying HttpClient.
I'd do that similar to the org.springframework.ws.transport.http.HttpComponentsMessageSender code:
((org.apache.http.impl.client.DefaultHttpClient) getHttpClient())
.getCredentialsProvider().setCredentials(authScope, credentials);
I mean in case of changing credential in the DB you should retrieve that #{httpComponentsMessageSender.httpClient} in your service and call that code.
In fact the credentials are used for each request:
context.setAttribute(
ClientContext.CREDS_PROVIDER,
getCredentialsProvider());
return context;
where it is used from the AbstractHttpClient.doExecute().
So, update the credentials on the HttpClient in one place has effect for the next HTTP Request from the <int-http:outbound-gateway>.
UPDATE
But, in this approach a new httpClient instance is being passed
Right, you can use the HttpClientBuilder but only once, on the initialization phase. I mean you need it for the httpClient injection to the httpComponentsMessageSender.
And the reason for that is because you can pass there (HttpClientBuilder) your own CredentialsProvider. When the same setCredentials(authScope, credentials) can be used from your DB service.