// 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 "RMQSuspendResumeDispatcher.h"
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#import "RMQErrors.h"
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typedef NS_ENUM(NSUInteger, DispatcherState) {
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DispatcherStateOpen = 1,
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DispatcherStateClosedByClient,
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DispatcherStateClosedByServer,
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};
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@interface RMQSuspendResumeDispatcher ()
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@property (nonatomic, readwrite) id<RMQChannel> channel;
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@property (nonatomic, readwrite) id<RMQSender> sender;
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@property (nonatomic, readwrite) RMQFramesetValidator *validator;
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@property (nonatomic, readwrite) id<RMQLocalSerialQueue> commandQueue;
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@property (nonatomic, readwrite) id<RMQLocalSerialQueue> enablementQueue;
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@property (nonatomic, readwrite) NSNumber *enableDelay;
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@property (nonatomic, readwrite) id<RMQConnectionDelegate> delegate;
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@property (nonatomic, readwrite) DispatcherState state;
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@property (nonatomic, readwrite) BOOL disabled;
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@end
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@implementation RMQSuspendResumeDispatcher
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- (instancetype)initWithSender:(id<RMQSender>)sender
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commandQueue:(id<RMQLocalSerialQueue>)commandQueue
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enablementQueue:(id<RMQLocalSerialQueue>)enablementQueue
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enableDelay:(NSNumber *)enableDelay {
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self = [super init];
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if (self) {
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self.channel = nil;
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self.sender = sender;
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self.validator = [RMQFramesetValidator new];
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self.commandQueue = commandQueue;
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self.enablementQueue = enablementQueue;
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self.enableDelay = enableDelay;
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self.state = DispatcherStateOpen;
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self.disabled = NO;
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}
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return self;
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}
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- (instancetype)initWithSender:(id<RMQSender>)sender
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commandQueue:(id<RMQLocalSerialQueue>)commandQueue {
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return [self initWithSender:sender commandQueue:commandQueue enablementQueue:nil enableDelay:@0];
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}
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- (void)activateWithChannel:(id<RMQChannel>)channel
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delegate:(id<RMQConnectionDelegate>)delegate {
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self.channel = channel;
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self.delegate = delegate;
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[self.commandQueue resume];
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}
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- (void)blockingWaitOn:(Class)method {
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[self.commandQueue blockingEnqueue:^{
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[self processOutgoing:nil executeOrErr:^{
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[self.commandQueue suspend];
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}];
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}];
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[self.commandQueue blockingEnqueue:^{
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RMQFramesetValidationResult *result = [self.validator expect:method];
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if (result.error) {
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[self.delegate channel:self.channel error:result.error];
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}
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}];
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}
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- (void)sendSyncMethod:(id<RMQMethod>)method
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completionHandler:(void (^)(RMQFrameset *frameset))completionHandler {
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[self.commandQueue enqueue:^{
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[self processOutgoing:method executeOrErr:^{
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if ([self isClose:method]) {
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[self processClientClose];
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}
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RMQFrameset *outgoingFrameset = [[RMQFrameset alloc] initWithChannelNumber:self.channelNumber
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method:method];
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[self.commandQueue suspend];
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[self.sender sendFrameset:outgoingFrameset];
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}];
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}];
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[self.commandQueue enqueue:^{
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RMQFramesetValidationResult *result = [self.validator expect:method.syncResponse];
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if (self.channelIsOpen && result.error) {
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[self.delegate channel:self.channel error:result.error];
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} else if (self.channelIsOpen) {
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completionHandler(result.frameset);
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}
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}];
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}
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- (void)sendSyncMethod:(id<RMQMethod>)method {
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[self sendSyncMethod:method
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completionHandler:^(RMQFrameset *frameset) {}];
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}
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- (void)sendSyncMethodBlocking:(id<RMQMethod>)method {
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[self.commandQueue blockingEnqueue:^{
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[self processOutgoing:method executeOrErr:^{
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RMQFrameset *frameset = [[RMQFrameset alloc] initWithChannelNumber:self.channelNumber method:method];
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[self.commandQueue suspend];
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[self.sender sendFrameset:frameset];
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}];
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}];
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[self.commandQueue blockingEnqueue:^{
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RMQFramesetValidationResult *result = [self.validator expect:method.syncResponse];
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if (self.channelIsOpen && result.error) {
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[self.delegate channel:self.channel error:result.error];
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}
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}];
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}
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- (void)sendAsyncFrameset:(RMQFrameset *)frameset {
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[self.commandQueue enqueue:^{
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[self processOutgoing:frameset.method executeOrErr:^{
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[self.sender sendFrameset:frameset];
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}];
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}];
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}
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- (void)sendAsyncMethod:(id<RMQMethod>)method {
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[self sendAsyncFrameset:[[RMQFrameset alloc] initWithChannelNumber:self.channelNumber method:method]];
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}
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- (void)enqueue:(RMQOperation)operation {
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[self.commandQueue enqueue:operation];
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}
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- (void)disable {
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self.disabled = YES;
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[self.commandQueue suspend];
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}
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- (void)enable {
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[self.enablementQueue delayedBy:self.enableDelay enqueue:^{
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self.disabled = NO;
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[self.commandQueue resume];
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}];
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}
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- (void)handleFrameset:(RMQFrameset *)frameset {
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if (!self.channelAlreadyClosedByServer && [self isClose:frameset.method]) {
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[self processServerClose:(RMQChannelClose *)frameset.method];
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} else if (self.channelIsOpen) {
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[self.validator fulfill:frameset];
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}
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if (!self.disabled) {
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[self.commandQueue resume];
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}
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}
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# pragma mark - Private
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- (void)processOutgoing:(id<RMQMethod>)method
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executeOrErr:(void (^)())operation {
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if (self.channelIsOpen) {
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operation();
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} else if (![self isClose:method]) {
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[self sendChannelClosedError];
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}
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}
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- (void)processClientClose {
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self.state = DispatcherStateClosedByClient;
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}
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- (void)processServerClose:(RMQChannelClose *)close {
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self.state = DispatcherStateClosedByServer;
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NSError *error = [NSError errorWithDomain:RMQErrorDomain
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code:close.replyCode.integerValue
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userInfo:@{NSLocalizedDescriptionKey: close.replyText.stringValue}];
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[self.delegate channel:self.channel error:error];
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[self.sender sendFrameset:[[RMQFrameset alloc] initWithChannelNumber:self.channelNumber
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method:[RMQChannelCloseOk new]]];
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}
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- (void)sendChannelClosedError {
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NSError *error = [NSError errorWithDomain:RMQErrorDomain
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code:RMQErrorChannelClosed
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userInfo:@{NSLocalizedDescriptionKey: @"Cannot use channel after it has been closed."}];
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[self.delegate channel:self.channel error:error];
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}
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- (BOOL)channelIsOpen {
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return self.state == DispatcherStateOpen;
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}
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- (BOOL)channelAlreadyClosedByServer {
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return self.state == DispatcherStateClosedByServer;
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}
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- (BOOL)isClose:(id<RMQMethod>)method {
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return [method isKindOfClass:[RMQChannelClose class]];
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}
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- (NSNumber *)channelNumber {
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return self.channel.channelNumber;
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}
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@end
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