X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;ds=sidebyside;f=engine%2Fcompbio%2Fengine%2FLoadBalancer.java;h=6185d424eb9ccfc0ca3037148cb7bdaa6bccff49;hb=HEAD;hp=b23b57c66bbabc322254209b6308c6ed82d96c25;hpb=535359a3d592ee41bda72e7356f0181f6cee9d07;p=jabaws.git

diff --git a/engine/compbio/engine/LoadBalancer.java b/engine/compbio/engine/LoadBalancer.java
index b23b57c..6185d42 100644
--- a/engine/compbio/engine/LoadBalancer.java
+++ b/engine/compbio/engine/LoadBalancer.java
@@ -20,21 +20,35 @@ package compbio.engine;
 
 import java.util.List;
 
+import org.apache.log4j.Logger;
+
 import compbio.data.sequence.FastaSequence;
 import compbio.engine.client.Executable;
 import compbio.engine.local.LocalExecutorService;
 import compbio.metadata.Limit;
 import compbio.metadata.PresetManager;
 
+/**
+ * This class decides where to execute the job. If the local engine is enabled
+ * in the configuration file and it has free threads and the size of the tasks
+ * permits the local execution, then the local execution will be favoured.
+ * 
+ * @author pvtroshin
+ * @version 1.0 March 2009
+ */
 public class LoadBalancer {
 
+	private static Logger log = Logger.getLogger(LoadBalancer.class);
+
 	private LoadBalancer() {
 	}
 
 	public static Executable.ExecProvider getEngine(Executable<?> executable) {
 		if (LocalExecutorService.getExecutor().canAcceptMoreWork()) {
+			log.debug("LOCAL engine HAS FREE threads will execute ... ");
 			return Executable.ExecProvider.Local;
 		}
+		log.debug("NO free threads on the LOCAL engine! Targeting for CLUSTER execution... ");
 		return Executable.ExecProvider.Cluster;
 	}
 
@@ -46,10 +60,13 @@ public class LoadBalancer {
 		// If limit is not defined then defaults to executing on the cluster
 		Limit<V> limit = executable
 				.getLimit(PresetManager.LOCAL_ENGINE_LIMIT_PRESET);
-
+		log.trace("Inspecting whether the job can be executed locally using limit: "
+				+ limit);
 		if (limit == null || limit.isExceeded(dataSet)) {
+			log.debug("Job EXCEEDS LOCAL execution LIMIT targeting for cluster execution! ");
 			return Executable.ExecProvider.Cluster;
 		}
+		log.debug("Job FITS into the LOCAL execution limit consulting load balancer... ");
 		// Even if the data satisfies criteria for local execution it may still
 		// be executed on the cluster as the maximum capacity for local engine
 		// may be reached.