Add support for running oltpbenchmark as an external executable cmd.

classpath.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
-echo -ne "build"
-for i in `ls lib/*.jar`; do
+echo -ne "$OLTPBENCH_HOME./build"
+for i in `ls $OLTPBENCH_HOME./lib/*.jar`; do
     # IMPORTANT: Make sure that we do not include hsqldb v1
     if [[ $i =~ .*hsqldb-1.* ]]; then
         continue

oltpbenchmark

@@ -1,3 +1,3 @@
 #!/bin/bash
-java -Xmx8G -cp `./classpath.sh bin` -Dlog4j.configuration=log4j.properties com.oltpbenchmark.DBWorkload $@
-
+# OLTPBENCH_HOME should be empty or end with "/"
+java -Xmx8G -cp `$OLTPBENCH_HOME./classpath.sh bin` -Dlog4j.configuration=$OLTPBENCH_HOME./log4j.properties com.oltpbenchmark.DBWorkload $@

src/com/oltpbenchmark/DBWorkload.java

@@ -84,7 +84,10 @@ public static void main(String[] args) throws Exception {
         CommandLineParser parser = new PosixParser();
         XMLConfiguration pluginConfig=null;
         try {
-            pluginConfig = new XMLConfiguration("config/plugin.xml");
+            String oltpbench_home = System.getenv("OLTPBENCH_HOME");
+            // OLTPBENCH_HOME should be empty or end with "/"
+            oltpbench_home = oltpbench_home == null ? "" : oltpbench_home + "/";
+            pluginConfig = new XMLConfiguration(oltpbench_home + "config/plugin.xml");
         } catch (ConfigurationException e1) {
             LOG.info("Plugin configuration file config/plugin.xml is missing");
             e1.printStackTrace();