v0.2.52..v0.2.53 changeset JavaEnvironment.cpp

diff --git a/hoot-josm/src/main/cpp/hoot/core/jni/JavaEnvironment.cpp b/hoot-josm/src/main/cpp/hoot/core/jni/JavaEnvironment.cpp
new file mode 100644
index 0000000..98a5d4b
--- /dev/null
+++ b/hoot-josm/src/main/cpp/hoot/core/jni/JavaEnvironment.cpp
@@ -0,0 +1,109 @@
+/*
+ * This file is part of Hootenanny.
+ *
+ * Hootenanny is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * --------------------------------------------------------------------
+ *
+ * The following copyright notices are generated automatically. If you
+ * have a new notice to add, please use the format:
+ * " * @copyright Copyright ..."
+ * This will properly maintain the copyright information. DigitalGlobe
+ * copyrights will be updated automatically.
+ *
+ * @copyright Copyright (C) 2019, 2020 DigitalGlobe (http://www.digitalglobe.com/)
+ */
+#include "JavaEnvironment.h"
+
+// hoot
+#include <hoot/core/util/ConfigOptions.h>
+#include <hoot/core/util/Log.h>
+#include <hoot/core/util/HootException.h>
+
+// Std
+#include <string.h>
+
+namespace hoot
+{
+
+JavaEnvironmentPtr JavaEnvironment::_theInstance;
+
+JavaEnvironment::JavaEnvironment() :
+_vm(0),
+_env(0)
+{
+}
+
+JavaEnvironment::~JavaEnvironment()
+{
+  if (_vm != 0)
+  {
+    _vm->DestroyJavaVM();
+  }
+}
+
+const JavaEnvironmentPtr& JavaEnvironment::getInstance()
+{
+  if (_theInstance.get() == 0)
+  {
+    _theInstance.reset(new JavaEnvironment());
+    _theInstance->_initVm();
+  }
+  return _theInstance;
+}
+
+void JavaEnvironment::_initVm()
+{
+  JavaVMInitArgs vm_args;
+  const int numOptions = 5;
+  JavaVMOption options[numOptions];
+
+  const QString classPathStr = "-Djava.class.path=" + ConfigOptions().getJniClassPath().join(":");
+  options[0].optionString = strdup(classPathStr.toStdString().c_str());
+  LOG_VART(options[0].optionString);
+
+  const QString minMemorySizeStr = "-Xms" + ConfigOptions().getJniInitialMemory();
+  options[1].optionString = strdup(minMemorySizeStr.toStdString().c_str());
+  LOG_VART(options[1].optionString);
+
+  const QString maxMemorySizeStr = "-Xms" + ConfigOptions().getJniMaxMemory();
+  options[2].optionString = strdup(maxMemorySizeStr.toStdString().c_str());
+  LOG_VART(options[2].optionString);
+
+  const QString maxPermMemorySizeStr = "-XX:MaxPermSize=" + ConfigOptions().getJniInitialMemory();
+  options[3].optionString = strdup(maxPermMemorySizeStr.toStdString().c_str());
+  LOG_VART(options[3].optionString);
+
+  const QString headlessStr = "-Djava.awt.headless=true";
+  options[4].optionString = strdup(headlessStr.toStdString().c_str());
+  LOG_VART(options[4].optionString);
+
+  // for debugging only
+//  const QString verboseStr = "-verbose:jni";
+//  options[5].optionString = strdup(verboseStr.toStdString().c_str());
+//  LOG_VART(options[5].optionString);
+
+  vm_args.version = JNI_VERSION_1_8;
+  vm_args.nOptions = numOptions;
+  vm_args.options = options;
+  vm_args.ignoreUnrecognized = 1;
+
+  jint res = JNI_CreateJavaVM(&_vm, (void**)&_env, &vm_args);
+  if (res != 0)
+  {
+    throw HootException("Unable to initialize JVM. Error code: " + QString::number(res));
+  }
+}
+
+}