/// <summary>
/// Determines whether we are on Java 9.
/// </summary>
private static bool IsJava9()
{
var args = new JvmInitArgs
{
version = JNI_VERSION_9
};
// Returns error on Java 8 and lower.
var res = JvmDll.Instance.GetDefaultJvmInitArgs(&args);
return(res == JniResult.Success);
}
/// <summary>
/// Gets the JVM pointer.
/// </summary>
private static IntPtr GetJvmPtr(IList <string> options)
{
IntPtr jvm;
int existingJvmCount;
// Use existing JVM if present.
var res = JvmDll.Instance.GetCreatedJvms(out jvm, 1, out existingJvmCount);
if (res != JniResult.Success)
{
throw new IgniteException("JNI_GetCreatedJavaVMs failed: " + res);
}
if (existingJvmCount > 0)
{
return(jvm);
}
var args = new JvmInitArgs
{
version = JNI_VERSION_1_6
};
if (options != null && options.Count > 0)
{
args.nOptions = options.Count;
var opt = new JvmOption[options.Count];
for (int i = 0; i < options.Count; i++)
{
opt[i].optionString = Marshal.StringToHGlobalAnsi(options[i]);
}
fixed(JvmOption *a = &opt[0])
{
args.options = a;
}
}
IntPtr env;
res = JvmDll.Instance.CreateJvm(out jvm, out env, &args);
if (res != JniResult.Success)
{
throw new IgniteException("JNI_CreateJavaVM failed: " + res);
}
return(jvm);
}
/// <summary>
/// Creates the JVM.
/// </summary>
private static IntPtr CreateJvm(IList <string> options)
{
if (IsJava9())
{
options = options == null
? Java9Options.ToList()
: new List <string>(options.Concat(Java9Options));
}
var args = new JvmInitArgs
{
version = JNI_VERSION_1_8,
nOptions = options.Count
};
var opts = GetJvmOptions(options);
try
{
JniResult res;
IntPtr jvm;
fixed(JvmOption *optPtr = &opts[0])
{
args.options = optPtr;
IntPtr unused;
res = JvmDll.Instance.CreateJvm(out jvm, out unused, &args);
}
if (res != JniResult.Success)
{
throw new IgniteException("JNI_CreateJavaVM failed: " + res);
}
return(jvm);
}
finally
{
foreach (var opt in opts)
{
Marshal.FreeHGlobal(opt.optionString);
}
}
}
