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Diffstat (limited to 'qpid/cpp/include/qmf/engine/Agent.h')
| -rw-r--r-- | qpid/cpp/include/qmf/engine/Agent.h | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/qpid/cpp/include/qmf/engine/Agent.h b/qpid/cpp/include/qmf/engine/Agent.h new file mode 100644 index 0000000000..71abf82254 --- /dev/null +++ b/qpid/cpp/include/qmf/engine/Agent.h @@ -0,0 +1,209 @@ +#ifndef _QmfEngineAgent_ +#define _QmfEngineAgent_ + +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +#include <qmf/engine/Schema.h> +#include <qmf/engine/ObjectId.h> +#include <qmf/engine/Object.h> +#include <qmf/engine/Event.h> +#include <qmf/engine/Query.h> +#include <qmf/engine/Value.h> +#include <qmf/engine/Message.h> + +namespace qmf { +namespace engine { + + /** + * AgentEvent + * + * This structure represents a QMF event coming from the agent to + * the application. + */ + struct AgentEvent { + enum EventKind { + GET_QUERY = 1, + START_SYNC = 2, + END_SYNC = 3, + METHOD_CALL = 4, + DECLARE_QUEUE = 5, + DELETE_QUEUE = 6, + BIND = 7, + UNBIND = 8, + SETUP_COMPLETE = 9 + }; + + EventKind kind; + uint32_t sequence; // Protocol sequence (for all kinds) + char* authUserId; // Authenticated user ID (for all kinds) + char* authToken; // Authentication token if issued (for all kinds) + char* name; // Name of the method/sync query + // (METHOD_CALL, START_SYNC, END_SYNC, DECLARE_QUEUE, BIND, UNBIND) + Object* object; // Object involved in method call (METHOD_CALL) + ObjectId* objectId; // ObjectId for method call (METHOD_CALL) + Query* query; // Query parameters (GET_QUERY, START_SYNC) + Value* arguments; // Method parameters (METHOD_CALL) + char* exchange; // Exchange for bind (BIND, UNBIND) + char* bindingKey; // Key for bind (BIND, UNBIND) + const SchemaObjectClass* objectClass; // (METHOD_CALL) + }; + + class AgentImpl; + + /** + * Agent - Protocol engine for the QMF agent + */ + class Agent { + public: + Agent(char* label, bool internalStore=true); + ~Agent(); + + /** + * Configure the directory path for storing persistent data. + *@param path Null-terminated string containing a directory path where files can be + * created, written, and read. If NULL, no persistent storage will be + * attempted. + */ + void setStoreDir(const char* path); + + /** + * Configure the directory path for files transferred over QMF. + *@param path Null-terminated string containing a directory path where files can be + * created, deleted, written, and read. If NULL, file transfers shall not + * be permitted. + */ + void setTransferDir(const char* path); + + /** + * Pass messages received from the AMQP session to the Agent engine. + *@param message AMQP messages received on the agent session. + */ + void handleRcvMessage(Message& message); + + /** + * Get the next message to be sent to the AMQP network. + *@param item The Message structure describing the message to be produced. + *@return true if the Message is valid, false if there are no messages to send. + */ + bool getXmtMessage(Message& item) const; + + /** + * Remove and discard one message from the head of the transmit queue. + */ + void popXmt(); + + /** + * Get the next application event from the agent engine. + *@param event The event iff the return value is true + *@return true if event is valid, false if there are no events to process + */ + bool getEvent(AgentEvent& event) const; + + /** + * Remove and discard one event from the head of the event queue. + */ + void popEvent(); + + /** + * A new AMQP session has been established for Agent communication. + */ + void newSession(); + + /** + * Start the QMF Agent protocol. This should be invoked after a SETUP_COMPLETE event + * is received from the Agent engine. + */ + void startProtocol(); + + /** + * This method is called periodically so the agent can supply a heartbeat. + */ + void heartbeat(); + + /** + * Respond to a method request. + *@param sequence The sequence number from the method request event. + *@param status The method's completion status. + *@param text Status text ("OK" or an error message) + *@param arguments The list of output arguments from the method call. + */ + void methodResponse(uint32_t sequence, uint32_t status, char* text, const Value& arguments); + + /** + * Send a content indication to the QMF bus. This is only needed for objects that are + * managed by the application. This is *NOT* needed for objects managed by the Agent + * (inserted using addObject). + *@param sequence The sequence number of the GET request or the SYNC_START request. + *@param object The object (annotated with "changed" flags) for publication. + *@param prop If true, changed object properties are transmitted. + *@param stat If true, changed object statistics are transmitted. + */ + void queryResponse(uint32_t sequence, Object& object, bool prop = true, bool stat = true); + + /** + * Indicate the completion of a query. This is not used for SYNC_START requests. + *@param sequence The sequence number of the GET request. + */ + void queryComplete(uint32_t sequence); + + /** + * Register a schema class with the Agent. + *@param cls A SchemaObejctClass object that defines data managed by the agent. + */ + void registerClass(SchemaObjectClass* cls); + + /** + * Register a schema class with the Agent. + *@param cls A SchemaEventClass object that defines events sent by the agent. + */ + void registerClass(SchemaEventClass* cls); + + /** + * Give an object to the Agent for storage and management. Once added, the agent takes + * responsibility for the life cycle of the object. + *@param obj The object to be managed by the Agent. + *@param persistId A unique non-zero value if the object-id is to be persistent. + *@return The objectId of the managed object. + */ + const ObjectId* addObject(Object& obj, uint64_t persistId); + // const ObjectId* addObject(Object& obj, uint32_t persistIdLo, uint32_t persistIdHi); + + /** + * Allocate an object-id for an object that will be managed by the application. + *@param persistId A unique non-zero value if the object-id is to be persistent. + *@return The objectId structure for the allocated ID. + */ + const ObjectId* allocObjectId(uint64_t persistId); + const ObjectId* allocObjectId(uint32_t persistIdLo, uint32_t persistIdHi); + + /** + * Raise an event into the QMF network.. + *@param event The event object for the event to be raised. + */ + void raiseEvent(Event& event); + + private: + AgentImpl* impl; + }; +} +} + +#endif + |