pvData/pvDataApp/misc/StatusCreateFactory.cpp

/*StatusCreateFactory.cpp*/
/**
 * Copyright - See the COPYRIGHT that is included with this distribution.
 * EPICS pvDataCPP is distributed subject to a Software License Agreement found
 * in file LICENSE that is included with this distribution.
 */
#include <cstddef>
#include <cstdlib>
#include <string>
#include <cstdio>
#include "lock.h"
#include "factory.h"
#include "byteBuffer.h"
#include "showConstructDestruct.h"
#include "status.h"
#include "serializeHelper.h"

#include <epicsThread.h>

namespace epics { namespace pvData {

PVDATA_REFCOUNT_MONITOR_DEFINE(status);

class StatusImpl : public Status
{
    public:
    
    StatusImpl(StatusType type, String message) :
        m_type(type), m_message(message)
    {
        PVDATA_REFCOUNT_MONITOR_CONSTRUCT(status);
    }

    StatusImpl(StatusType type, String message, String stackDump) :
        m_type(type), m_message(message), m_stackDump(stackDump)
    {
        PVDATA_REFCOUNT_MONITOR_CONSTRUCT(status);
    }
    
    virtual ~StatusImpl() {
        PVDATA_REFCOUNT_MONITOR_DESTRUCT(status);
    }
    
    virtual StatusType getType()
    {
        return m_type;    
    }
    

    virtual epics::pvData::String getMessage()
    {
        return m_message;
    }
    
    virtual epics::pvData::String getStackDump()
    {
        return m_stackDump;
    }
    
    virtual bool isOK()
    {
	   return (m_type == STATUSTYPE_OK);
    }
    
    virtual bool isSuccess()
    {
        return (m_type == STATUSTYPE_OK || m_type == STATUSTYPE_WARNING);
    }

    virtual void serialize(ByteBuffer *buffer, SerializableControl *flusher)
    {
		flusher->ensureBuffer(1);
		if (this == getStatusCreate()->getStatusOK())
		{
			// special code for okStatus (optimization)
			buffer->putByte((int8)-1);
		}
		else
		{
			buffer->putByte((int8)m_type);
			SerializeHelper::serializeString(m_message, buffer, flusher);
			SerializeHelper::serializeString(m_stackDump, buffer, flusher);
		}
    }
    
    virtual void deserialize(ByteBuffer *pbuffer, DeserializableControl *pflusher)
    {
	   throw new std::runtime_error("use getStatusCreate()->deserialize()");
    }

    virtual String toString()
    {
        String str;
        toString(&str, 0);
        return str;
    }

    virtual void toString(StringBuilder buffer, int indentLevel)
    {
        *buffer += "StatusImpl [type=";
        *buffer += StatusTypeName[m_type];
        if (!m_message.empty())
        {
            *buffer += ", message=";
            *buffer += m_message;
        }
        if (!m_stackDump.empty())
        {
            *buffer += ", stackDump=";
            *buffer += '\n';
            *buffer += m_stackDump;
        }
        *buffer += ']';
    }

    private:
    
    StatusType m_type;
    String m_message;
    String m_stackDump;
    
};



static epicsThreadOnceId statusFactoryInit = EPICS_THREAD_ONCE_INIT;


class StatusCreateImpl : public StatusCreate {
    public:
    
    StatusCreateImpl()
    {
        m_ok = createStatus(STATUSTYPE_OK, "OK", 0);
    }

    ~StatusCreateImpl()
    {
        delete m_ok;
    }
    
    virtual Status* getStatusOK() {
        return m_ok;
    }
        	
    virtual Status* createStatus(StatusType type, String message, BaseException* cause) {
        if (cause == 0)
            return new StatusImpl(type, message);
        else
        {
            return new StatusImpl(type, message, cause->what());
        }
    }
        	
    virtual Status* deserializeStatus(ByteBuffer* buffer, DeserializableControl* control) {
		control->ensureData(1);
		int8 typeCode = buffer->getByte();
		if (typeCode == (int8)-1)
			return m_ok;
		else {
			String message = SerializeHelper::deserializeString(buffer, control);
			String stackDump = SerializeHelper::deserializeString(buffer, control);
			return new StatusImpl((StatusType)typeCode, message, stackDump);
		}
    }

    static StatusCreateImpl* getInstance()
    {
        epicsThreadOnce(&statusFactoryInit, &StatusCreateImpl::init, 0);
        assert(singleton);
        return singleton;
    }

    private:
    
    Status* m_ok;
    
    static StatusCreateImpl *singleton;
    
    static void init(void*) {
        singleton = new StatusCreateImpl();
    }
    
};




StatusCreateImpl* StatusCreateImpl::singleton = 0;

StatusCreate* getStatusCreate() {
    return StatusCreateImpl::getInstance();
}

}}