added trace logging for requests

src/main/java/com/inteligr8/rs/Client.java

@@ -37,7 +37,8 @@ public abstract class Client {
 			provider.enable(DeserializationFeature.UNWRAP_ROOT_VALUE);
 		
 		ClientBuilder clientBuilder = ClientBuilder.newBuilder()
-				.register(provider);
+				.register(provider)
+				.register(new LoggingFilter());
 
 		if (authFilter == null)
 			authFilter = this.getConfig().createAuthorizationFilter();

src/main/java/com/inteligr8/rs/LoggingFilter.java

@@ -0,0 +1,52 @@
+package com.inteligr8.rs;
+
+import java.io.IOException;
+
+import javax.ws.rs.client.ClientRequestContext;
+import javax.ws.rs.client.ClientRequestFilter;
+import javax.ws.rs.client.ClientResponseContext;
+import javax.ws.rs.client.ClientResponseFilter;
+import javax.ws.rs.core.Form;
+import javax.ws.rs.core.MediaType;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+public class LoggingFilter implements ClientRequestFilter, ClientResponseFilter {
+	
+	private final Logger loggerRequest = LoggerFactory.getLogger("jaxrs.request");
+	private final Logger loggerResponse = LoggerFactory.getLogger("jaxrs.response");
+	
+	private final ObjectMapper om = new ObjectMapper();
+	
+	@Override
+	public void filter(ClientRequestContext requestContext) throws IOException {
+		if (this.loggerRequest.isTraceEnabled()) {
+			if (MediaType.APPLICATION_JSON_TYPE.equals(requestContext.getMediaType())) {
+				this.loggerRequest.trace("request: {} {}: {}", requestContext.getMethod(), requestContext.getUri(),
+						this.om.writeValueAsString(requestContext.getEntity()));
+			} else if (MediaType.APPLICATION_FORM_URLENCODED_TYPE.equals(requestContext.getMediaType())) {
+				if (requestContext.getEntity() instanceof Form) {
+					this.loggerRequest.trace("request: {} {}: {}", requestContext.getMethod(), requestContext.getUri(),
+							((Form)requestContext.getEntity()).asMap());
+				} else {
+					this.loggerRequest.trace("request: {} {}: failed to output form", requestContext.getMethod(), requestContext.getUri());
+				}
+			} else if (requestContext.getMediaType() != null) {
+				this.loggerRequest.trace("request '{}': {} {}", requestContext.getMediaType(), requestContext.getMethod(), requestContext.getUri());
+			} else {
+				this.loggerRequest.trace("request: {} {}", requestContext.getMethod(), requestContext.getUri());
+			}
+		}
+	}
+	
+	@Override
+	public void filter(ClientRequestContext requestContext, ClientResponseContext responseContext) throws IOException {
+		if (this.loggerResponse.isTraceEnabled()) {
+			this.loggerResponse.warn("response: NOT YET SUPPORTED");
+		}
+	}
+
+}