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aerospike
aerospike_scan.h
Go to the documentation of this file.
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/*
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* Copyright 2008-2014 Aerospike, Inc.
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*
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* Portions may be licensed to Aerospike, Inc. under one or more contributor
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* license agreements.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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#pragma once
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/**
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* @defgroup scan_operations Scan Operations
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* @ingroup client_operations
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*
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* Aerospike Scan Operations provide the ability to scan all record of a
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* namespace and set in an Aerospike database.
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*
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* ## Usage
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*
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* Before you can execute a scan, you first need to define a scan using
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* as_scan. See as_scan for details on defining scans.
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*
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* Once you have a scan defined, then you can execute the scan
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* using either:
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*
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* - aerospike_scan_foreach() — Execute a scan on the database, then process
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* the results.
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* - aerospike_scan_background() — Send a scan to the database, and not wait
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* for completed. The scan is given an id, which can be used to query the
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* scan status.
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*
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* When aerospike_scan_foreach() is executed, it will process the results
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* and create records on the stack. Because the records are on the stack,
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* they will only be available within the context of the callback function.
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*
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* When aerospike_scan_background() is executed, the client will not wait for
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* results from the database. Instead, the client will be given a scan_id,
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* which can be used to query the scan status on the database via
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* aerospike_scan_info().
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*
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* ## Walk-through
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*
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* First, we build a scan using as_scan. The scan will be on the "test"
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* namespace and "demo" set. We will select only bins "a" and "b" to be returned
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* for each record.
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*
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* ~~~~~~~~~~{.c}
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* as_scan scan;
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* as_scan_init(&scan, "test", "demo");
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*
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* as_scan_select_inita(&scan, 2);
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* as_scan_select(&scan, "a");
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* as_scan_select(&scan, "B");
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* ~~~~~~~~~~
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*
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* Now that we have a scan defined, we want to execute it using
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* aerospike_scan_foreach().
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*
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* ~~~~~~~~~~{.c}
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* if ( aerospike_scan_foreach(&as, &err, NULL, &scan, callback, NULL) != AEROSPIKE_OK ) {
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* fprintf(stderr, "error(%d) %s at [%s:%d]", err.code, err.message, err.file, err.line);
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* }
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* ~~~~~~~~~~
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*
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* The callback provided to the function above is implemented as:
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*
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* ~~~~~~~~~~{.c}
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* bool callback(const as_val * val, void * udata) {
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* as_record * rec = as_record_fromval(val);
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* if ( !rec ) return false;
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* fprintf("record contains %d bins", as_record_numbins(rec));
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* return true;
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* }
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* ~~~~~~~~~~
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*
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* An as_scan is simply a scan definition, so it does not contain any state,
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* allowing it to be reused for multiple scan operations.
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*
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* When you are finished with the scan, you should destroy the resources
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* allocated to it:
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*
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* ~~~~~~~~~~{.c}
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* as_scan_destroy(&scan);
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* ~~~~~~~~~~
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*/
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#include <
aerospike/aerospike.h
>
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#include <
aerospike/as_error.h
>
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#include <
aerospike/as_policy.h
>
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#include <
aerospike/as_scan.h
>
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#include <
aerospike/as_status.h
>
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#include <
aerospike/as_val.h
>
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/******************************************************************************
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* TYPES
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*****************************************************************************/
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/**
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* This callback will be called for each value or record returned from
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* a scan.
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*
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* The following functions accept the callback:
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* - aerospike_scan_foreach()
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* - aerospike_scan_node_foreach()
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*
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* ~~~~~~~~~~{.c}
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* bool my_callback(const as_val * val, void * udata) {
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* return true;
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* }
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* ~~~~~~~~~~
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*
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* @param val The value received from the query.
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* @param udata User-data provided to the calling function.
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*
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* @return `true` to continue to the next value. Otherwise, iteration will end.
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*
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* @ingroup scan_operations
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*/
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typedef
bool (*
aerospike_scan_foreach_callback
)(
const
as_val
* val,
void
* udata);
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/******************************************************************************
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* FUNCTIONS
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*****************************************************************************/
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/**
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* Scan the records in the specified namespace and set in the cluster.
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*
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* Scan will be run in the background by a thread on client side.
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* No callback will be called in this case.
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*
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* ~~~~~~~~~~{.c}
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* as_scan scan;
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* as_scan_init(&scan, "test", "demo");
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*
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* uint64_t scanid = 0;
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*
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* if ( aerospike_scan_background(&as, &err, NULL, &scan, &scanid) != AEROSPIKE_OK ) {
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* fprintf(stderr, "error(%d) %s at [%s:%d]", err.code, err.message, err.file, err.line);
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* }
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* else {
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* printf("Running background scan job: %ll", scanid);
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* }
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*
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* as_scan_destroy(&scan);
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* ~~~~~~~~~~
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*
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* The scanid can be used to query the status of the scan running in the
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* database via aerospike_scan_info().
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*
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* @param as The aerospike instance to use for this operation.
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* @param err The as_error to be populated if an error occurs.
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* @param policy The policy to use for this operation. If NULL, then the default policy will be used.
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* @param scan The scan to execute against the cluster.
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* @param scan_id The id for the scan job, which can be used for querying the status of the scan.
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*
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* @return AEROSPIKE_OK on success. Otherwise an error occurred.
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*
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* @ingroup scan_operations
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*/
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as_status
aerospike_scan_background
(
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aerospike
* as,
as_error
* err,
const
as_policy_scan
* policy,
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const
as_scan
* scan, uint64_t * scan_id
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);
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/**
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* Check the progress of a background scan running on the database. The status
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* of the scan running on the datatabse will be populated into an as_scan_info.
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*
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* ~~~~~~~~~~{.c}
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* uint64_t scan_id = 1234;
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* as_scan_info scan_info;
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*
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* if ( aerospike_scan_info(&as, &err, NULL, &scan, scan_id, &scan_info) != AEROSPIKE_OK ) {
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* fprintf(stderr, "error(%d) %s at [%s:%d]", err.code, err.message, err.file, err.line);
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* }
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* else {
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* printf("Scan id=%ll, status=%d percent=%d", scan_id, scan_info.status, scan_info.progress_pct);
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* }
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* ~~~~~~~~~~
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*
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*
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* @param as The aerospike instance to use for this operation.
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* @param err The as_error to be populated if an error occurs.
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* @param policy The policy to use for this operation. If NULL, then the default policy will be used.
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* @param scan_id The id for the scan job to check the status of.
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* @param info Information about this scan, to be populated by this operation.
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*
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* @return AEROSPIKE_OK on success. Otherwise an error occurred.
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*
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* @ingroup scan_operations
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*/
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as_status
aerospike_scan_info
(
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aerospike
* as,
as_error
* err,
const
as_policy_info
* policy,
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uint64_t scan_id,
as_scan_info
* info
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);
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/**
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* Scan the records in the specified namespace and set in the cluster.
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*
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* Call the callback function for each record scanned. When all records have
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* been scanned, then callback will be called with a NULL value for the record.
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*
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* ~~~~~~~~~~{.c}
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* as_scan scan;
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* as_scan_init(&scan, "test", "demo");
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*
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* if ( aerospike_scan_foreach(&as, &err, NULL, &scan, callback, NULL) != AEROSPIKE_OK ) {
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* fprintf(stderr, "error(%d) %s at [%s:%d]", err.code, err.message, err.file, err.line);
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* }
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*
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* as_scan_destroy(&scan);
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* ~~~~~~~~~~
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*
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*
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* @param as The aerospike instance to use for this operation.
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* @param err The as_error to be populated if an error occurs.
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* @param policy The policy to use for this operation. If NULL, then the default policy will be used.
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* @param scan The scan to execute against the cluster.
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* @param callback The function to be called for each record scanned.
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* @param udata User-data to be passed to the callback.
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*
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* @return AEROSPIKE_OK on success. Otherwise an error occurred.
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*
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* @ingroup scan_operations
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*/
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as_status
aerospike_scan_foreach
(
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aerospike
* as,
as_error
* err,
const
as_policy_scan
* policy,
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const
as_scan
* scan,
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aerospike_scan_foreach_callback
callback,
void
* udata
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);