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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * 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 io.gravitee.gateway.policy.impl.tracing;

import io.gravitee.gateway.api.ExecutionContext;
import io.gravitee.gateway.api.buffer.Buffer;
import io.gravitee.gateway.api.handler.Handler;
import io.gravitee.gateway.api.stream.ReadStream;
import io.gravitee.gateway.api.stream.ReadWriteStream;
import io.gravitee.gateway.api.stream.WriteStream;
import io.gravitee.gateway.policy.Policy;
import io.gravitee.tracing.api.Span;
import io.gravitee.tracing.api.Tracer;

/**
 * A traced {@link ReadWriteStream} used to trace beginning and ending of the policy execution.
 *
 * @author David BRASSELY (david.brassely at graviteesource.com)
 * @author GraviteeSource Team
 */
public class TracingReadWriteStream implements ReadWriteStream {

    private final Tracer tracer;
    private final ReadWriteStream stream;
    private final Policy policy;
    private Span span;

    public TracingReadWriteStream(final ExecutionContext context, final ReadWriteStream stream, final Policy policy) {
        this.policy = policy;
        this.tracer = context.getTracer();
        this.stream = stream;
    }

    @Override
    public ReadStream bodyHandler(Handler bodyHandler) {
        span = tracer.span(this.policy.id()).withAttribute(TracingPolicy.SPAN_ATTRIBUTE, this.policy.id());
        stream.bodyHandler(bodyHandler);

        return this;
    }

    @Override
    public ReadStream endHandler(Handler endHandler) {
        stream.endHandler(endHandler);

        return this;
    }

    @Override
    public ReadStream pause() {
        stream.pause();
        return this;
    }

    @Override
    public ReadStream resume() {
        stream.resume();
        return this;
    }

    @Override
    public WriteStream write(Buffer chunk) {
        stream.write(chunk);
        return this;
    }

    @Override
    public void end() {
        stream.end();
        span.end();
    }

    @Override
    public void end(Buffer chunk) {
        stream.end(chunk);
        span.end();
    }

    @Override
    public WriteStream drainHandler(Handler drainHandler) {
        stream.drainHandler(drainHandler);
        return this;
    }

    @Override
    public boolean writeQueueFull() {
        return stream.writeQueueFull();
    }
}