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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.documentapi;
import com.yahoo.messagebus.Error;
import com.yahoo.messagebus.ErrorCode;
/**
* The <i>synchronous</i> result of submitting an asynchronous operation.
* A result is either a success or not. If it is not a success, it will contain an explanation of why.
* Document repositories may return subclasses which contain more information.
*
* @author bratseth
*/
public class Result {
/** Null if this is a success, set to the error occurring if this is a failure */
private final Error error;
/** The id of this operation */
private final long requestId;
private final ResultType type;
/** Creates a successful result with requestId zero */
public Result() {
this(0);
}
/**
* Creates a successful result
*
* @param requestId the ID of the request
*/
public Result(long requestId) {
this.error = null;
this.requestId = requestId;
type = ResultType.SUCCESS;
}
/**
* Creates a unsuccessful result
*
* @param type the type of failure
* @param error the error to encapsulate in this Result
* @see com.yahoo.documentapi.Result.ResultType
*/
public Result(ResultType type, Error error) {
this.type = type;
this.error = error;
this.requestId = 0;
}
/**
* Returns whether this operation is a success.
* If it is a success, the operation is accepted and one or more responses are guaranteed
* to arrive within this sessions timeout limit.
* If this is not a success, this operation has no further consequences.
*
* @return true if success
*/
public boolean isSuccess() { return type == ResultType.SUCCESS; }
public Error error() { return error; }
/**
* Returns the id of this operation. The asynchronous response to this operation
* will contain the same id to allow clients who desire to, to match operations to responses.
*
* @return the id of this operation
*/
public long getRequestId() { return requestId; }
/**
* Returns the type of result.
*
* @return the type of result, typically if this is an error or a success, and what kind of error.
* @see com.yahoo.documentapi.Result.ResultType
*/
public ResultType type() { return type;}
/** The types that a Result can have. */
public enum ResultType {
/** The request was successful, no error information is attached. */
SUCCESS,
/** The request failed, but may be successful if retried at a later time. */
TRANSIENT_ERROR,
/** The request failed, and retrying is pointless. */
FATAL_ERROR
}
public static Error toError(ResultType result) {
switch (result) {
case TRANSIENT_ERROR:
return new Error(ErrorCode.TRANSIENT_ERROR, ResultType.TRANSIENT_ERROR.name());
case FATAL_ERROR:
return new Error(ErrorCode.FATAL_ERROR, ResultType.FATAL_ERROR.name());
}
return new Error(ErrorCode.NONE, "SUCCESS");
}
}
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