impl_holder.held = new ChannelMessageHandler(new bindings.LDKChannelMessageHandler() {
@Override public void handle_open_channel(byte[] their_node_id, long their_features, long msg) {
InitFeatures their_features_hu_conv = new InitFeatures(null, their_features);
+ their_features_hu_conv.ptrs_to.add(this);
OpenChannel msg_hu_conv = new OpenChannel(null, msg);
arg.handle_open_channel(their_node_id, their_features_hu_conv, msg_hu_conv);
}
@Override public void handle_accept_channel(byte[] their_node_id, long their_features, long msg) {
InitFeatures their_features_hu_conv = new InitFeatures(null, their_features);
+ their_features_hu_conv.ptrs_to.add(this);
AcceptChannel msg_hu_conv = new AcceptChannel(null, msg);
arg.handle_accept_channel(their_node_id, their_features_hu_conv, msg_hu_conv);
}
public void handle_open_channel(byte[] their_node_id, InitFeatures their_features, OpenChannel msg) {
bindings.ChannelMessageHandler_handle_open_channel(this.ptr, their_node_id, their_features == null ? 0 : their_features.ptr & ~1, msg == null ? 0 : msg.ptr & ~1);
this.ptrs_to.add(their_features);
+ // Due to rust's strict-ownership memory model, in some cases we need to "move"
+ // an object to pass exclusive ownership to the function being called.
+ // In most cases, we avoid this being visible in GC'd languages by cloning the object
+ // at the FFI layer, creating a new object which Rust can claim ownership of
+ // However, in some cases (eg here), there is no way to clone an object, and thus
+ // we actually have to pass full ownership to Rust.
+ // Thus, after this call, their_features is reset to null and is now a dummy object.
+ their_features.ptr = 0;
this.ptrs_to.add(msg);
}
public void handle_accept_channel(byte[] their_node_id, InitFeatures their_features, AcceptChannel msg) {
bindings.ChannelMessageHandler_handle_accept_channel(this.ptr, their_node_id, their_features == null ? 0 : their_features.ptr & ~1, msg == null ? 0 : msg.ptr & ~1);
this.ptrs_to.add(their_features);
+ // Due to rust's strict-ownership memory model, in some cases we need to "move"
+ // an object to pass exclusive ownership to the function being called.
+ // In most cases, we avoid this being visible in GC'd languages by cloning the object
+ // at the FFI layer, creating a new object which Rust can claim ownership of
+ // However, in some cases (eg here), there is no way to clone an object, and thus
+ // we actually have to pass full ownership to Rust.
+ // Thus, after this call, their_features is reset to null and is now a dummy object.
+ their_features.ptr = 0;
this.ptrs_to.add(msg);
}