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/
ApiTracer.java
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/
ApiTracer.java
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/*
* Copyright 2018 Google LLC
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.google.api.gax.tracing;
import com.google.api.core.InternalApi;
import org.threeten.bp.Duration;
/**
* Implementations of this class trace the logical flow of a google cloud client.
*
* <p>A single instance of a tracer represents a logical operation that can be annotated throughout
* its lifecycle. Constructing an instance of a subclass will implicitly signal the start of a new
* operation.
*
* <p>For internal use only. google-cloud-java libraries should extend {@link BaseApiTracer}.
*/
@InternalApi
public interface ApiTracer {
/**
* Asks the underlying implementation to install itself as a thread local. This allows for interop
* between clients using gax and external resources to share the same implementation of the
* tracing. For example OpenCensus will install a thread local that can read by the GRPC.
*/
Scope inScope();
/**
* Signals that the overall operation has finished successfully. The tracer is now considered
* closed and should no longer be used.
*/
void operationSucceeded();
/**
* Signals that the operation was cancelled by the user. The tracer is now considered closed and
* should no longer be used.
*/
void operationCancelled();
/**
* Signals that the overall operation has failed and no further attempts will be made. The tracer
* is now considered closed and should no longer be used.
*
* @param error the final error that caused the operation to fail.
*/
void operationFailed(Throwable error);
/**
* Annotates the operation with selected connection id from the {@code ChannelPool}.
*
* @param id the local connection identifier of the selected connection.
*/
void connectionSelected(String id);
/**
* Adds an annotation that an attempt is about to start. In general this should occur at the very
* start of the operation. The attemptNumber is zero based. So the initial attempt will be 0.
*
* @param attemptNumber the zero based sequential attempt number.
* @deprecated Please use {@link #attemptStarted(Object, int)} instead.
*/
@Deprecated
void attemptStarted(int attemptNumber);
/**
* Adds an annotation that an attempt is about to start with additional information from the
* request. In general this should occur at the very start of the operation. The attemptNumber is
* zero based. So the initial attempt will be 0.
*
* @param attemptNumber the zero based sequential attempt number.
* @param request request of this attempt.
*/
void attemptStarted(Object request, int attemptNumber);
/** Adds an annotation that the attempt succeeded. */
void attemptSucceeded();
/** Add an annotation that the attempt was cancelled by the user. */
void attemptCancelled();
/**
* Adds an annotation that the attempt failed, but another attempt will be made after the delay.
*
* @param error the transient error that caused the attempt to fail.
* @param delay the amount of time to wait before the next attempt will start.
*/
void attemptFailed(Throwable error, Duration delay);
/**
* Adds an annotation that the attempt failed and that no further attempts will be made because
* retry limits have been reached.
*
* @param error the last error received before retries were exhausted.
*/
void attemptFailedRetriesExhausted(Throwable error);
/**
* Adds an annotation that the attempt failed and that no further attempts will be made because
* the last error was not retryable.
*
* @param error the error that caused the final attempt to fail.
*/
void attemptPermanentFailure(Throwable error);
/**
* Signals that the initial RPC for the long running operation failed.
*
* @param error the error that caused the long running operation fail.
*/
void lroStartFailed(Throwable error);
/**
* Signals that the initial RPC successfully started the long running operation. The long running
* operation will now be polled for completion.
*/
void lroStartSucceeded();
/** Adds an annotation that a streaming response has been received. */
void responseReceived();
/** Adds an annotation that a streaming request has been sent. */
void requestSent();
/**
* Adds an annotation that a batch of writes has been flushed.
*
* @param elementCount the number of elements in the batch.
* @param requestSize the size of the batch in bytes.
*/
void batchRequestSent(long elementCount, long requestSize);
/**
* A context class to be used with {@link #inScope()} and a try-with-resources block. Closing a
* {@link Scope} removes any context that the underlying implementation might've set in {@link
* #inScope()}.
*/
interface Scope extends AutoCloseable {
@Override
void close();
}
}