CODEWITHSUNDEEP
javahttpclientresteasyapache-httpclient-4.x
Faiza Aslam
Faiza Aslam

Reputation: 77

getConnectionManager() when using ApacheHttpClient43Engine RestEasy client v3.6.3.Final

I migrated my WildFly server from 10 to 16. It now uses resteasy-client of version 3.6.3.Final which uses version 4.5.4 of http-client. The problem is I am unable to get connection manager being created internally when I create restEasyClient from builder as shown below:

this.resteasyClient = new ResteasyClientBuilder()
                .connectionPoolSize(DEFAULT_POOL_SIZE)
                .maxPooledPerRoute(DEFAULT_POOL_SIZE)
                .build();

How can I get connection manager from ApacheHttpClient43Engine engine? My ultimate goal is to get PoolStats from manager which should be PoolingHttpClientConnectionManager in my case [PoolingHttpClientConnectionManager#getTotalStats].

The code I am using to get the connection manager is as follows:

ApacheHttpClient43Engine engine = (ApacheHttpClient43Engine) resteasyClient.httpEngine();
ClientConnectionManager cm = engine.getHttpClient().getConnectionManager();

This method getConnectionManager() is deprecated and does not get HttpClientConnectionManager.

How can I get PoolStats from my restEasyClient?

Thanks in advance

Upvotes: 1

Views: 1980

Answers (2)

irieill
irieill

Reputation: 1252

You can create your own instance of PoolingHttpClientConnectionManager, configure it, keep a reference of it to work with and explicitly set it via setConnectionManager() of HttpClientBuilder to create a HttpClient as hinted on the deprecation.

Afterwards just instruct RESTEasy to use that HttpClient instance by creating your own ApacheHttpClient43Engine with the appropriate constructor and configure it via httpEngine() of ResteasyClientBuilder.

PoolingHttpClientConnectionManager connectionManager =
  new PoolingHttpClientConnectionManager();
connectionManager.setMaxTotal(DEFAULT_POOL_SIZE);
connectionManager.setDefaultMaxPerRoute(DEFAULT_POOL_SIZE);
HttpClient httpClient = HttpClientBuilder
  .create()
  .setConnectionManager(connectionManager)
  .build();

ApacheHttpClient43Engine engine = new ApacheHttpClient43Engine(httpClient);
ResteasyClient resteasyClient = new ResteasyClientBuilder()
  .httpEngine(engine)
  .build();

connectionManager.getTotalStats();

Upvotes: 1

Alessio Soldano
Alessio Soldano

Reputation: 671

You can't get the PoolingHttpClientConnectionManager instance created by RESTEasy when building the HTTP Client that way, the reason is that engine.getHttpClient().getConnectionManager() returns a different implementation of the deprecated ClientConnectionManager interface.

What you could do, instead, is:

  1. Creating your own implementation of the org.jboss.resteasy.client.jaxrs.ClientHttpEngineBuilder interface, extending org.jboss.resteasy.client.jaxrs.ClientHttpEngineBuilder43 and overriding the createEngine(..) method: you would simply delegate to super.createEngine(..), but you can store the HttpClientConnectionManager instance that's passed as first parameter and which should be what you're looking for.
  2. Then you can use the your new custom ClientHttpEngineBuilder to create the ClientHttpEngine to be provided when creating the client:

ResteasyClientBuilder builder = new ResteasyClientBuilder(); ClientHttpEngine customClientHttpEngine = newCustomClientHttpEngineBuilder().resteasyClientBuilder(builder).build(); this.resteasyClient = builder .httpEngine(customClientHttpEngine) .connectionPoolSize(DEFAULT_POOL_SIZE) .maxPooledPerRoute(DEFAULT_POOL_SIZE) .build();

  1. Later on, you can access the connection manager from the custom ClientHttpEngineBuilder

Hope this helps.

Upvotes: 1

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