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package org.jruby.ext.ffi.jffi;
import com.kenai.jffi.CallingConvention;
import com.kenai.jffi.InvocationBuffer;
import org.jruby.RubyProc;
import org.jruby.ext.ffi.CallbackInfo;
import org.jruby.ext.ffi.Pointer;
import org.jruby.runtime.Block;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
/**
* Converts a ruby block or proc into a native callback.
*/
final class CallbackMarshaller implements ParameterMarshaller {
private final CallbackInfo cbInfo;
private final CallingConvention convention;
public CallbackMarshaller(CallbackInfo cbInfo, CallingConvention convention) {
this.cbInfo = cbInfo;
this.convention = convention;
}
public void marshal(Invocation invocation, InvocationBuffer buffer, IRubyObject value) {
marshal(invocation.getThreadContext(), buffer, value);
}
public void marshal(ThreadContext context, InvocationBuffer buffer, IRubyObject value) {
if (value.isNil()) {
buffer.putAddress(0);
} else if (value instanceof RubyProc || value.respondsTo("call")) {
marshalParam(context, buffer, value);
} else {
throw context.getRuntime().newTypeError("wrong argument type. Expected callable object");
}
}
private static final class CallbackReaper implements Runnable {
private final CallbackManager.Callback cb;
public CallbackReaper(CallbackManager.Callback cb) {
this.cb = cb;
}
public void run() {
cb.dispose();
}
}
void marshal(Invocation session, InvocationBuffer buffer, Block value) {
final CallbackManager.Callback cb = CallbackManager.getInstance().getCallback(session.getThreadContext().getRuntime(), cbInfo, value);
buffer.putAddress(cb.getAddress());
//
// Adding a post-invoke for the cb result serves to both keep it alive
// until after the function returns, and allows us to clean up the native
// trampoline early, instead of letting them accumulate until a GC run
//
session.addPostInvoke(new CallbackReaper(cb));
}
private void marshalParam(ThreadContext context, InvocationBuffer buffer, Object value) {
Pointer cb = CallbackManager.getInstance().getCallback(context.getRuntime(), cbInfo, value);
buffer.putAddress(cb.getAddress());
}
public boolean requiresPostInvoke() {
return true;
}
public boolean requiresReference() {
return false;
}
}