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                <?php declare(strict_types=1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace OpenStack\BlockStorage\v2;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use OpenStack\BlockStorage\v2\Models\QuotaSet;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use OpenStack\BlockStorage\v2\Models\Snapshot;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use OpenStack\BlockStorage\v2\Models\Volume;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use OpenStack\BlockStorage\v2\Models\VolumeType;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use OpenStack\Common\Service\AbstractService;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @property \OpenStack\BlockStorage\v2\Api $api  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Service extends AbstractService  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Provisions a new bootable volume, based either on an existing volume, image or snapshot.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * You must have enough volume storage quota remaining to create a volume of size requested.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $userOptions {@see Api::postVolumes} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return Volume  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function createVolume(array $userOptions): Volume  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->model(Volume::class)->create($userOptions);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Lists all available volumes.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param bool  $detail      If set to TRUE, more information will be returned.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $userOptions {@see Api::getVolumes} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return \Generator  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function listVolumes(bool $detail = false, array $userOptions = []): \Generator  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $def = ($detail === true) ? $this->api->getVolumesDetail() : $this->api->getVolumes();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->model(Volume::class)->enumerate($def, $userOptions);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $volumeId The UUID of the volume being retrieved.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return Volume  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function getVolume(string $volumeId): Volume  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $volume = $this->model(Volume::class);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $volume->populateFromArray(['id' => $volumeId]);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return $volume;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $userOptions {@see Api::postTypes} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return VolumeType  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function createVolumeType(array $userOptions): VolumeType  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->model(VolumeType::class)->create($userOptions);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return \Generator  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function listVolumeTypes(): \Generator  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->model(VolumeType::class)->enumerate($this->api->getTypes(), []);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $typeId  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return VolumeType  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getVolumeType(string $typeId): VolumeType  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $type = $this->model(VolumeType::class);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $type->populateFromArray(['id' => $typeId]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $type;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $userOptions {@see Api::postSnapshots} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return Snapshot  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function createSnapshot(array $userOptions): Snapshot  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->model(Snapshot::class)->create($userOptions);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             1                          | 
                
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                     * @return \Generator  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function listSnapshots(bool $detail = false, array $userOptions = []): \Generator  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $def = ($detail === true) ? $this->api->getSnapshotsDetail() : $this->api->getSnapshots();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->model(Snapshot::class)->enumerate($def, $userOptions);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $snapshotId  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             1                          | 
                
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                     * @return Snapshot  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getSnapshot(string $snapshotId): Snapshot  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             1                          | 
                
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $snapshot = $this->model(Snapshot::class);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $snapshot->populateFromArray(['id' => $snapshotId]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $snapshot;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Shows A Quota for a tenant  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $tenantId  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return QuotaSet  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getQuotaSet(string $tenantId): QuotaSet  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $quotaSet = $this->model(QuotaSet::class);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $quotaSet->populateFromResponse($this->execute($this->api->getQuotaSet(), ['tenantId' => $tenantId]));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $quotaSet;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: