Method spawnWithResult

java/lib/src/main/java/io/github/ccxt/Exchange.java:1861–1876

Start an async method-name call on the virtual executor and return a Future that resolves with the result (or is rejected on failure). Used by WS transpile output to replace TS `this.spawn(this.method, ...args)` when the return value is captured (e.g., stored in a cache). Mirrors how the TS Promise

(String methodName, Object... args)

     * how the TS Promise returned by `this.spawn(...)` is consumed.
     */
    public io.github.ccxt.ws.Future spawnWithResult(String methodName, Object... args) {
        io.github.ccxt.ws.Future fut = new io.github.ccxt.ws.Future();
        this.spawn(() -> {
            try {
                Object result = Helpers.callDynamically(this, methodName, args);
                // callDynamically may return a CompletableFuture — unwrap
                if (result instanceof java.util.concurrent.CompletableFuture<?> cf) {
                    result = cf.join();
                }
                fut.resolve(result);
            } catch (Exception e) {
                fut.reject(e);
            }
        });
        return fut;
    }

    /**
     * Load order book snapshot from REST and merge with cached deltas.