Add retry in parameter in the Throttling exception, and take into acc…

…ount last execution duration

src/main/java/com/cp/compiler/exceptions/CompilerThrottlingException.java

@@ -22,4 +22,8 @@ public class CompilerThrottlingException extends MonitoredException {
     public CompilerThrottlingException(String message) {
         super(message, ErrorCode.THROTTLING_ERROR, ErrorType.WARNING, true, RETRY_IN);
     }
+
+    public CompilerThrottlingException(String message, int retryIn ) {
+        super(message, ErrorCode.THROTTLING_ERROR, ErrorType.WARNING, true, retryIn);
+    }
 }

src/main/java/com/cp/compiler/services/api/CompilerProxy.java

@@ -109,7 +109,7 @@ public ResponseEntity<RemoteCodeCompilerResponse> execute(Execution execution) {
         throttlingCounterMetric.increment();
         String errorMessage = "Request has been throttled, service reached maximum resources usage";
         log.warn(errorMessage);
-        throw new CompilerThrottlingException(errorMessage);
+        throw new CompilerThrottlingException(errorMessage, resources.lastExecutionDuration.intValue());
     }
 
     private ResponseEntity<RemoteCodeCompilerResponse> compileAndExecute(Execution execution) {

src/main/java/com/cp/compiler/services/businesslogic/strategies/CompiledLanguagesExecutionStrategy.java

@@ -30,7 +30,7 @@
  */
 @Slf4j
 @Component("compiled")
-public class CompiledLanguagesExecutionStrategy extends ExecutionStrategy {
+public class CompiledLanguagesExecutionStrategy extends ExecutionStrategyDecorator {
 
     // Note: this value should not be updated, once update don't forget to update build.sh script used to build these images.
     private static final String IMAGE_PREFIX_NAME = "compiler.";

src/main/java/com/cp/compiler/services/businesslogic/strategies/ExecutionStrategy.java

@@ -53,7 +53,7 @@ public abstract class ExecutionStrategy {
 
     private static final long EXECUTION_TIME_OUT = 20000; // in ms
 
-    private final Resources resources;
+    protected final Resources resources;
 
     private static final String TEST_CASE_ID_ENV_VARIABLE = "TEST_CASE_ID";
 

src/main/java/com/cp/compiler/services/businesslogic/strategies/ExecutionStrategyDecorator.java

@@ -0,0 +1,43 @@
+package com.cp.compiler.services.businesslogic.strategies;
+
+import com.cp.compiler.executions.Execution;
+import com.cp.compiler.models.ExecutionResponse;
+import com.cp.compiler.services.platform.containers.ContainerService;
+import com.cp.compiler.services.platform.resources.Resources;
+import io.micrometer.core.instrument.MeterRegistry;
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public abstract class ExecutionStrategyDecorator extends ExecutionStrategy {
+
+    /**
+     * Instantiates a new Execution strategy.
+     *
+     * @param containerService the container service
+     * @param meterRegistry    the meter registry
+     * @param resources        the resources
+     */
+    protected ExecutionStrategyDecorator(ContainerService containerService, MeterRegistry meterRegistry, Resources resources) {
+        super(containerService, meterRegistry, resources);
+    }
+
+    @Override
+    public ExecutionResponse run(Execution execution, boolean deleteImageAfterExecution) {
+
+        long startTime = System.nanoTime();
+
+        var executionResponse = super.run(execution, deleteImageAfterExecution);
+
+        long endTime = System.nanoTime();
+        long elapsedTime = endTime - startTime;
+
+        // Convert elapsed time to seconds
+        double elapsedTimeInMilliSeconds = (double) elapsedTime / 1_000_000;
+        log.info("Total execution duration took {} milliseconds", elapsedTimeInMilliSeconds);
+
+        // Update last execution time, used to suggest retry in case of a throttling.
+        resources.lastExecutionDuration.set(elapsedTimeInMilliSeconds);
+
+        return executionResponse;
+    }
+}

src/main/java/com/cp/compiler/services/businesslogic/strategies/InterpretedLanguagesExecutionStrategy.java

@@ -19,7 +19,7 @@
  */
 @Slf4j
 @Component("interpreted")
-public class InterpretedLanguagesExecutionStrategy extends ExecutionStrategy {
+public class InterpretedLanguagesExecutionStrategy extends ExecutionStrategyDecorator {
 
     private final MeterRegistry meterRegistry;
 

src/main/java/com/cp/compiler/services/platform/resources/Resources.java

@@ -1,14 +1,20 @@
 package com.cp.compiler.services.platform.resources;
 
 import com.cp.compiler.contract.resources.AvailableResources;
+import com.google.common.util.concurrent.AtomicDouble;
 
 /**
  * The interface Cpu resources.
  *
  * @author Zakaria Maaraki
  */
 public interface Resources {
-
+
+    /**
+     * Used for retry after.
+     */
+    AtomicDouble lastExecutionDuration = new AtomicDouble(-1);
+
     /**
      * Gets max cpus.
      *