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polardbxengine/storage/ndb/ndbapi-examples/ndbapi_event/ndbapi_event.cpp

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/*
Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* ndbapi_event.cpp: Using API level events in NDB API
*
* Classes and methods used in this example:
*
* Ndb_cluster_connection
* connect()
* wait_until_ready()
*
* Ndb
* init()
* getDictionary()
* createEventOperation()
* dropEventOperation()
* pollEvents()
* nextEvent()
*
* NdbDictionary
* createEvent()
* dropEvent()
*
* NdbDictionary::Event
* setTable()
* addTableEvent()
* addEventColumn()
*
* NdbEventOperation
* getValue()
* getPreValue()
* execute()
* getEventType()
*
*/
#include <NdbApi.hpp>
#include <stdlib.h>
#include <string.h>
// Used for cout
#include <stdio.h>
#include <iostream>
#ifdef VM_TRACE
#include <my_dbug.h>
#endif
#ifndef assert
#include <assert.h>
#endif
/**
* Assume that there is a table which is being updated by
* another process (e.g. flexBench -l 0 -stdtables).
* We want to monitor what happens with column values.
*
* Or using the mysql client:
*
* shell> mysql -u root
* mysql> create database ndb_examples;
* mysql> use ndb_examples;
* mysql> create table t0
(c0 int, c1 int, c2 char(4), c3 char(4), c4 text,
primary key(c0, c2)) engine ndb charset latin1;
*
* In another window start ndbapi_event, wait until properly started
insert into t0 values (1, 2, 'a', 'b', null);
insert into t0 values (3, 4, 'c', 'd', null);
update t0 set c3 = 'e' where c0 = 1 and c2 = 'a'; -- use pk
update t0 set c3 = 'f'; -- use scan
update t0 set c3 = 'F'; -- use scan update to 'same'
update t0 set c2 = 'g' where c0 = 1; -- update pk part
update t0 set c2 = 'G' where c0 = 1; -- update pk part to 'same'
update t0 set c0 = 5, c2 = 'H' where c0 = 3; -- update full PK
delete from t0;
insert ...; update ...; -- see events w/ same pk merged (if -m option)
delete ...; insert ...; -- there are 5 combinations ID IU DI UD UU
update ...; update ...;
-- text requires -m flag
set @a = repeat('a',256); -- inline size
set @b = repeat('b',2000); -- part size
set @c = repeat('c',2000*30); -- 30 parts
-- update the text field using combinations of @a, @b, @c ...
* you should see the data popping up in the example window
*
*/
#define APIERROR(error) \
{ std::cout << "Error in " << __FILE__ << ", line:" << __LINE__ << ", code:" \
<< error.code << ", msg: " << error.message << "." << std::endl; \
exit(-1); }
int myCreateEvent(Ndb* myNdb,
const char *eventName,
const char *eventTableName,
const char **eventColumnName,
const int noEventColumnName,
bool merge_events);
int main(int argc, char** argv)
{
if (argc < 3)
{
std::cout << "Arguments are <connect_string cluster> <timeout> [m(merge events)|d(debug)].\n";
exit(-1);
}
const char *connectstring = argv[1];
int timeout = atoi(argv[2]);
ndb_init();
bool merge_events = argc > 3 && strchr(argv[3], 'm') != 0;
#ifdef VM_TRACE
bool dbug = argc > 3 && strchr(argv[3], 'd') != 0;
if (dbug)
{
// Turn on dbug tracing
DBUG_PUSH("d:t:");
// Print signals to stdout
static char env[100];
strcpy(env, "API_SIGNAL_LOG=-");
putenv(env);
}
#endif
Ndb_cluster_connection *cluster_connection=
new Ndb_cluster_connection(connectstring); // Object representing the cluster
int r= cluster_connection->connect(5 /* retries */,
3 /* delay between retries */,
1 /* verbose */);
if (r > 0)
{
std::cout
<< "Cluster connect failed, possibly resolved with more retries.\n";
exit(-1);
}
else if (r < 0)
{
std::cout
<< "Cluster connect failed.\n";
exit(-1);
}
if (cluster_connection->wait_until_ready(30,30))
{
std::cout << "Cluster was not ready within 30 secs." << std::endl;
exit(-1);
}
Ndb* myNdb= new Ndb(cluster_connection,
"ndb_examples"); // Object representing the database
if (myNdb->init() == -1) APIERROR(myNdb->getNdbError());
const char *eventName= "CHNG_IN_t0";
const char *eventTableName= "t0";
const int noEventColumnName= 5;
const char *eventColumnName[noEventColumnName]=
{"c0",
"c1",
"c2",
"c3",
"c4"
};
// Create events
myCreateEvent(myNdb,
eventName,
eventTableName,
eventColumnName,
noEventColumnName,
merge_events);
// Normal values and blobs are unfortunately handled differently..
typedef union { NdbRecAttr* ra; NdbBlob* bh; } RA_BH;
int i, j, k, l;
j = 0;
while (j < timeout) {
// Start "transaction" for handling events
NdbEventOperation* op;
printf("create EventOperation\n");
if ((op = myNdb->createEventOperation(eventName)) == NULL)
APIERROR(myNdb->getNdbError());
op->mergeEvents(merge_events);
printf("get values\n");
RA_BH recAttr[noEventColumnName];
RA_BH recAttrPre[noEventColumnName];
// primary keys should always be a part of the result
for (i = 0; i < noEventColumnName; i++) {
if (i < 4) {
recAttr[i].ra = op->getValue(eventColumnName[i]);
recAttrPre[i].ra = op->getPreValue(eventColumnName[i]);
} else if (merge_events) {
recAttr[i].bh = op->getBlobHandle(eventColumnName[i]);
recAttrPre[i].bh = op->getPreBlobHandle(eventColumnName[i]);
}
}
// set up the callbacks
printf("execute\n");
// This starts changes to "start flowing"
if (op->execute())
APIERROR(op->getNdbError());
NdbEventOperation* the_op = op;
i= 0;
while (i < timeout) {
// printf("now waiting for event...\n");
int r = myNdb->pollEvents(1000); // wait for event or 1000 ms
if (r > 0) {
// printf("got data! %d\n", r);
while ((op= myNdb->nextEvent())) {
assert(the_op == op);
i++;
switch (op->getEventType()) {
case NdbDictionary::Event::TE_INSERT:
printf("%u INSERT", i);
break;
case NdbDictionary::Event::TE_DELETE:
printf("%u DELETE", i);
break;
case NdbDictionary::Event::TE_UPDATE:
printf("%u UPDATE", i);
break;
default:
abort(); // should not happen
}
printf(" gci=%d\n", (int)op->getGCI());
for (k = 0; k <= 1; k++) {
printf(k == 0 ? "post: " : "pre : ");
for (l = 0; l < noEventColumnName; l++) {
if (l < 4) {
NdbRecAttr* ra = k == 0 ? recAttr[l].ra : recAttrPre[l].ra;
if (ra->isNULL() >= 0) { // we have a value
if (ra->isNULL() == 0) { // we have a non-null value
if (l < 2)
printf("%-5u", ra->u_32_value());
else
printf("%-5.4s", ra->aRef());
} else
printf("%-5s", "NULL");
} else
printf("%-5s", "-"); // no value
} else if (merge_events) {
int isNull;
NdbBlob* bh = k == 0 ? recAttr[l].bh : recAttrPre[l].bh;
bh->getDefined(isNull);
if (isNull >= 0) { // we have a value
if (! isNull) { // we have a non-null value
Uint64 length = 0;
bh->getLength(length);
// read into buffer
unsigned char* buf = new unsigned char [length];
memset(buf, 'X', length);
Uint32 n = length;
bh->readData(buf, n); // n is in/out
assert(n == length);
// pretty-print
bool first = true;
Uint32 i = 0;
while (i < n) {
unsigned char c = buf[i++];
Uint32 m = 1;
while (i < n && buf[i] == c)
i++, m++;
if (! first)
printf("+");
printf("%u%c", m, c);
first = false;
}
printf("[%u]", n);
delete [] buf;
} else
printf("%-5s", "NULL");
} else
printf("%-5s", "-"); // no value
}
}
printf("\n");
}
}
} // else printf("timed out (%i)\n", timeout);
}
// don't want to listen to events anymore
if (myNdb->dropEventOperation(the_op)) APIERROR(myNdb->getNdbError());
the_op = 0;
j++;
}
{
NdbDictionary::Dictionary *myDict = myNdb->getDictionary();
if (!myDict) APIERROR(myNdb->getNdbError());
// remove event from database
if (myDict->dropEvent(eventName)) APIERROR(myDict->getNdbError());
}
delete myNdb;
delete cluster_connection;
ndb_end(0);
return 0;
}
int myCreateEvent(Ndb* myNdb,
const char *eventName,
const char *eventTableName,
const char **eventColumnNames,
const int noEventColumnNames,
bool merge_events)
{
NdbDictionary::Dictionary *myDict= myNdb->getDictionary();
if (!myDict) APIERROR(myNdb->getNdbError());
const NdbDictionary::Table *table= myDict->getTable(eventTableName);
if (!table) APIERROR(myDict->getNdbError());
NdbDictionary::Event myEvent(eventName, *table);
myEvent.addTableEvent(NdbDictionary::Event::TE_ALL);
// myEvent.addTableEvent(NdbDictionary::Event::TE_INSERT);
// myEvent.addTableEvent(NdbDictionary::Event::TE_UPDATE);
// myEvent.addTableEvent(NdbDictionary::Event::TE_DELETE);
myEvent.addEventColumns(noEventColumnNames, eventColumnNames);
myEvent.mergeEvents(merge_events);
// Add event to database
if (myDict->createEvent(myEvent) == 0)
myEvent.print();
else if (myDict->getNdbError().classification ==
NdbError::SchemaObjectExists) {
printf("Event creation failed, event exists\n");
printf("dropping Event...\n");
if (myDict->dropEvent(eventName)) APIERROR(myDict->getNdbError());
// try again
// Add event to database
if ( myDict->createEvent(myEvent)) APIERROR(myDict->getNdbError());
} else
APIERROR(myDict->getNdbError());
return 0;
}
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