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/*
 * Copyright 2018-2019 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.glowroot.instrumentation.kafka;

import org.apache.kafka.clients.producer.Callback;
import org.apache.kafka.clients.producer.RecordMetadata;

import org.glowroot.instrumentation.api.AsyncSpan;
import org.glowroot.instrumentation.api.AuxThreadContext;
import org.glowroot.instrumentation.api.Span;
import org.glowroot.instrumentation.api.checker.Nullable;

class CallbackWrapper implements Callback {

    private final Callback delegate;
    private final AsyncSpan span;
    private final AuxThreadContext auxContext;

    CallbackWrapper(Callback delegate, AsyncSpan span, AuxThreadContext auxContext) {
        this.delegate = delegate;
        this.span = span;
        this.auxContext = auxContext;
    }

    @Override
    public void onCompletion(@Nullable RecordMetadata metadata, @Nullable Exception exception) {
        if (exception == null) {
            span.end();
        } else {
            span.endWithError(exception);
        }
        Span span = auxContext.start();
        try {
            delegate.onCompletion(metadata, exception);
        } catch (Throwable t) {
            span.endWithError(t);
            throw rethrow(t);
        }
        span.end();
    }

    private static RuntimeException rethrow(Throwable t) {
        CallbackWrapper.throwsUnchecked(t);
        throw new AssertionError();
    }

    @SuppressWarnings("unchecked")
    private static  void throwsUnchecked(Throwable t) throws T {
        throw (T) t;
    }
}