Resolve "Create missing service classes"

Closes #16 (closed)

src/main/java/cz/muni/ics/kypo/training/adaptive/service/api/SandboxServiceApi.java

 package cz.muni.ics.kypo.training.adaptive.service.api;
 
-import cz.muni.ics.kypo.training.adaptive.domain.training.TrainingRun;
 import cz.muni.ics.kypo.training.adaptive.dto.responses.LockedPoolInfo;
 import cz.muni.ics.kypo.training.adaptive.dto.responses.PoolInfoDTO;
+import cz.muni.ics.kypo.training.adaptive.dto.responses.SandboxDefinitionInfo;
 import cz.muni.ics.kypo.training.adaptive.dto.responses.SandboxInfo;
 import cz.muni.ics.kypo.training.adaptive.exceptions.CustomWebClientException;
 import cz.muni.ics.kypo.training.adaptive.exceptions.ForbiddenException;
 import cz.muni.ics.kypo.training.adaptive.exceptions.MicroserviceApiException;
+import cz.muni.ics.kypo.training.adaptive.exceptions.errors.PythonApiError;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Qualifier;
-import org.springframework.core.ParameterizedTypeReference;
 import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Service;
 import org.springframework.web.reactive.function.client.WebClient;
 import reactor.core.publisher.Mono;
 
-import java.util.List;
-import java.util.Map;
 
 /**
  * The type User service.
@@ -105,4 +103,26 @@ public class SandboxServiceApi {
             }
         }
     }
+
+    /**
+     * Gets sandbox definition id.
+     *
+     * @param poolId the pool id
+     * @return the sandbox definition id
+     */
+    public SandboxDefinitionInfo getSandboxDefinitionId(Long poolId) {
+        try {
+            return sandboxServiceWebClient
+                    .get()
+                    .uri("/pools/{poolId}/definition", poolId)
+                    .retrieve()
+                    .bodyToMono(SandboxDefinitionInfo.class)
+                    .block();
+        } catch (CustomWebClientException ex) {
+            if (ex.getStatusCode() == HttpStatus.CONFLICT) {
+                throw new ForbiddenException("There is no available sandbox definition for particular pool (ID: " + poolId + ").");
+            }
+            throw new MicroserviceApiException("Error when calling Python API to sandbox for particular pool (ID: " + poolId + ")", new PythonApiError(ex.getMessage()));
+        }
+    }
 }