1 package org.ldk.structs;
3 import org.ldk.impl.bindings;
4 import org.ldk.enums.*;
6 import java.util.Arrays;
7 import java.lang.ref.Reference;
8 import javax.annotation.Nullable;
11 * A trait which should be implemented to provide feerate information on a number of time
14 * If access to a local mempool is not feasible, feerate estimates should be fetched from a set of
15 * third-parties hosting them. Note that this enables them to affect the propagation of your
16 * pre-signed transactions at any time and therefore endangers the safety of channels funds. It
17 * should be considered carefully as a deployment.
19 * Note that all of the functions implemented here *must* be reentrant-safe (obviously - they're
20 * called from inside the library in response to chain events, P2P events, or timer events).
22 * LDK may generate a substantial number of fee-estimation calls in some cases. You should
23 * pre-calculate and cache the fee estimate results to ensure you don't substantially slow HTLC
26 @SuppressWarnings("unchecked") // We correctly assign various generic arrays
27 public class FeeEstimator extends CommonBase {
28 final bindings.LDKFeeEstimator bindings_instance;
29 FeeEstimator(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }
30 private FeeEstimator(bindings.LDKFeeEstimator arg) {
31 super(bindings.LDKFeeEstimator_new(arg));
32 this.ptrs_to.add(arg);
33 this.bindings_instance = arg;
35 @Override @SuppressWarnings("deprecation")
36 protected void finalize() throws Throwable {
37 if (ptr != 0) { bindings.FeeEstimator_free(ptr); } super.finalize();
40 * Destroys the object, freeing associated resources. After this call, any access
41 * to this object may result in a SEGFAULT or worse.
43 * You should generally NEVER call this method. You should let the garbage collector
44 * do this for you when it finalizes objects. However, it may be useful for types
45 * which represent locks and should be closed immediately to avoid holding locks
48 public void destroy() {
49 if (ptr != 0) { bindings.FeeEstimator_free(ptr); }
52 public static interface FeeEstimatorInterface {
54 * Gets estimated satoshis of fee required per 1000 Weight-Units.
56 * LDK will wrap this method and ensure that the value returned is no smaller than 253
57 * (ie 1 satoshi-per-byte rounded up to ensure later round-downs don't put us below 1 satoshi-per-byte).
59 * The following unit conversions can be used to convert to sats/KW:
60 * satoshis-per-byte * 250
61 * satoshis-per-kbyte / 4
63 int get_est_sat_per_1000_weight(ConfirmationTarget confirmation_target);
65 private static class LDKFeeEstimatorHolder { FeeEstimator held; }
66 public static FeeEstimator new_impl(FeeEstimatorInterface arg) {
67 final LDKFeeEstimatorHolder impl_holder = new LDKFeeEstimatorHolder();
68 impl_holder.held = new FeeEstimator(new bindings.LDKFeeEstimator() {
69 @Override public int get_est_sat_per_1000_weight(ConfirmationTarget confirmation_target) {
70 int ret = arg.get_est_sat_per_1000_weight(confirmation_target);
71 Reference.reachabilityFence(arg);
75 return impl_holder.held;
78 * Gets estimated satoshis of fee required per 1000 Weight-Units.
80 * LDK will wrap this method and ensure that the value returned is no smaller than 253
81 * (ie 1 satoshi-per-byte rounded up to ensure later round-downs don't put us below 1 satoshi-per-byte).
83 * The following unit conversions can be used to convert to sats/KW:
84 * satoshis-per-byte * 250
85 * satoshis-per-kbyte / 4
87 public int get_est_sat_per_1000_weight(org.ldk.enums.ConfirmationTarget confirmation_target) {
88 int ret = bindings.FeeEstimator_get_est_sat_per_1000_weight(this.ptr, confirmation_target);
89 Reference.reachabilityFence(this);
90 Reference.reachabilityFence(confirmation_target);