// This source code is dual-licensed under the Mozilla Public License ("MPL"),
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// version 1.1 and the Apache License ("ASL"), version 2.0.
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//
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// The ASL v2.0:
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//
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// ---------------------------------------------------------------------------
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// Copyright 2016 Pivotal Software, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// 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,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ---------------------------------------------------------------------------
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//
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// The MPL v1.1:
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//
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// ---------------------------------------------------------------------------
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// The contents of this file are subject to the Mozilla Public License
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// Version 1.1 (the "License"); you may not use this file except in
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// compliance with the License. You may obtain a copy of the License at
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// https://www.mozilla.org/MPL/
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//
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// Software distributed under the License is distributed on an "AS IS"
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// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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// License for the specific language governing rights and limitations
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// under the License.
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//
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// The Original Code is RabbitMQ
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//
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// The Initial Developer of the Original Code is Pivotal Software, Inc.
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// All Rights Reserved.
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//
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// Alternatively, the contents of this file may be used under the terms
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// of the Apache Standard license (the "ASL License"), in which case the
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// provisions of the ASL License are applicable instead of those
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// above. If you wish to allow use of your version of this file only
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// under the terms of the ASL License and not to allow others to use
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// your version of this file under the MPL, indicate your decision by
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// deleting the provisions above and replace them with the notice and
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// other provisions required by the ASL License. If you do not delete
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// the provisions above, a recipient may use your version of this file
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// under either the MPL or the ASL License.
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// ---------------------------------------------------------------------------
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#import "RMQTransactionalConfirmations.h"
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#import "RMQConfirmationTransaction.h"
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@interface RMQTransactionalConfirmations ()
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@property (nonatomic, readwrite) NSUInteger offset;
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@property (nonatomic, readwrite) NSUInteger nextPublishSequenceNumber;
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@property (nonatomic, readwrite) NSMutableArray *transactions;
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@property (nonatomic, readwrite) NSUInteger transactionIndex;
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@property (nonatomic, readwrite) id<RMQLocalSerialQueue> delayQueue;
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@end
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@implementation RMQTransactionalConfirmations
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- (instancetype)initWithDelayQueue:(id<RMQLocalSerialQueue>)queue {
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self = [super init];
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if (self) {
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self.offset = 0;
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self.nextPublishSequenceNumber = 0;
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self.transactions = [NSMutableArray new];
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self.delayQueue = queue;
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[self addTransaction];
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self.transactionIndex = 0;
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}
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return self;
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}
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- (instancetype)init {
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[self doesNotRecognizeSelector:_cmd];
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return nil;
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}
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- (void)enable {
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self.nextPublishSequenceNumber = 1;
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}
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- (BOOL)isEnabled {
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return self.nextPublishSequenceNumber > 0;
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}
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- (void)recover {
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self.offset = self.nextPublishSequenceNumber - 1;
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}
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- (NSNumber *)addPublication {
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NSNumber *publicationSequenceNumber = @(self.nextPublishSequenceNumber);
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if (self.isEnabled) {
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[self.currentTransaction addUnconfirmed:publicationSequenceNumber];
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self.nextPublishSequenceNumber++;
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}
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return publicationSequenceNumber;
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}
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- (void)addCallbackWithTimeout:(NSNumber *)timeoutInSecs
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callback:(RMQConfirmationCallback)callback {
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[self.currentTransaction setCallback:callback
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timeout:timeoutInSecs];
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[self.currentTransaction completeIfReady];
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[self addTransaction];
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}
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- (void)ack:(RMQBasicAck *)ack {
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for (NSNumber *tag in [self offsetTags:ack]) {
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[[self transactionForUnconfirmedTag:tag] ack:tag];
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}
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}
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- (void)nack:(RMQBasicNack *)nack {
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for (NSNumber *tag in [self offsetTags:nack]) {
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[[self transactionForUnconfirmedTag:tag] nack:tag];
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}
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}
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#pragma mark - Private
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- (RMQConfirmationTransaction *)transactionForUnconfirmedTag:(NSNumber *)tag {
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NSPredicate *pred = [NSPredicate predicateWithBlock:^BOOL(RMQConfirmationTransaction *tx, NSDictionary<NSString *,id> * bindings) {
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return [tx isUnconfirmed:tag];
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}];
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NSArray *filtered = [self.transactions filteredArrayUsingPredicate:pred];
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return filtered.count > 0 ? filtered[0] : nil;
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}
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- (RMQConfirmationTransaction *)currentTransaction {
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return self.transactions[self.transactionIndex];
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}
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- (void)addTransaction {
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[self.transactions addObject:[[RMQConfirmationTransaction alloc] initWithDelayQueue:self.delayQueue]];
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self.transactionIndex++;
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}
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- (NSArray *)offsetTags:(id)ackOrNack {
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RMQBasicAck *ack = (RMQBasicAck *)ackOrNack;
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uint64_t highestTag = ack.deliveryTag.integerValue;
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BOOL isMultiple = ack.options & RMQBasicAckMultiple;
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uint64_t lowestTag = isMultiple ? 1 : highestTag;
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NSMutableArray *tags = [NSMutableArray new];
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for (uint64_t tag = lowestTag; tag <= highestTag; tag++) {
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[tags addObject:@(tag + self.offset)];
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}
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return tags;
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}
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@end
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