/**
* Prints every word a phrase on different nodes.
*
* @param phrase Phrase from which to print words on different nodes.
* @throws GridException If failed.
*/
private static void spreadWordsClosure(String phrase) throws GridException {
X.println(">>> Starting spreadWordsClosure() example...");
// Splits the passed in phrase into words and prints every word
// on a individual grid node. If there are more words than nodes -
// some nodes will print more than one word.
G.grid()
.run(
SPREAD,
F.yield(
phrase.split(" "),
new GridInClosure<String>() {
@Override
public void apply(String word) {
X.println(word);
}
}));
// NOTE:
//
// Alternatively, you can use existing closure 'F.println()' to
// print any yield result in 'F.yield()' like so:
//
// G.grid().run(SPREAD, F.yield(phrase.split(" "), F.println()));
//
X.println(">>>");
X.println(
">>> Finished printing individual words on different nodes based on GridGain 3.0 API.");
X.println(">>> Check all nodes for output (this node is also part of the grid).");
X.println(">>>");
}
/**
* Broadcasts a give phrase to all nodes.
*
* @param phrase Phrase to broadcast.
* @throws GridException If failed.
*/
private static void broadcastWordsClosure(final String phrase) throws GridException {
X.println(">>> Starting broadcastWordsClosure() example...");
G.grid()
.run(
BROADCAST,
new GridAbsClosure() {
@Override
public void apply() {
X.println(">>> Printing phrase: " + phrase);
}
});
// NOTE:
//
// Alternatively, you can use existing closure 'F.println()' to
// print any text like so:
//
// G.grid().run(BROADCAST, F.println(">>> Printing phrase: " + phrase));
//
X.println(">>>");
X.println(">>> Finished broadcasting a phrase to all grid nodes based on GridGain 3.0 API.");
X.println(">>> Check all nodes for output (this node is also part of the grid).");
X.println(">>>");
}
/**
* Method grid-enabled with {@link Gridify} annotation and will be executed on the grid. Simply
* prints out the argument passed in and returns its length.
*
* <p>Note that in this case instead of using default task, we provide our own task which will
* split the passed in string into separate words to be printed on remote nodes. The timeout
* parameter tells grid that method execution should fail if no result is received in 5 seconds.
*
* @param phrase Phrase string to print.
* @return Number of characters in the phrase.
*/
@Gridify(taskClass = GridifyHelloWorldTask.class, timeout = 5000)
public static int sayIt(String phrase) {
// Simply print out the argument.
X.println(">>>");
X.println(">>> Printing '" + phrase + "' on this node from grid-enabled method.");
X.println(">>>");
return phrase.length();
}
/**
* Queries all persons and shows their names.
*
* @param conn JDBC connection.
* @throws SQLException In case of SQL error.
*/
private static void queryAllPersons(Connection conn) throws SQLException {
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("select name from Person");
X.println(">>> All persons:");
while (rs.next()) X.println(">>> " + rs.getString(1));
}
/** {@inheritDoc} */
@Override
public Object onReceive(@Nullable Object obj) {
if (obj instanceof byte[]) {
X.println(">>> Byte array received over REST: " + Arrays.toString((byte[]) obj));
BigInteger val = new BigInteger((byte[]) obj);
X.println(">>> Unpacked a BigInteger from byte array received over REST: " + val);
return val;
} else return obj;
}
/**
* Queries persons older than provided age.
*
* @param conn JDBC connection.
* @param minAge Minimum age.
* @throws SQLException In case of SQL error.
*/
private static void queryPersons(Connection conn, int minAge) throws SQLException {
PreparedStatement stmt = conn.prepareStatement("select name, age from Person where age >= ?");
stmt.setInt(1, minAge);
ResultSet rs = stmt.executeQuery();
X.println(">>> Persons older than " + minAge + ":");
while (rs.next())
X.println(">>> " + rs.getString("NAME") + " (" + rs.getInt("AGE") + " years old)");
}
/** {@inheritDoc} */
@Override
public Object onSend(Object obj) {
if (obj instanceof BigInteger) {
X.println(">>> Creating byte array from BigInteger to send over REST: " + obj);
byte[] bytes = ((BigInteger) obj).toByteArray();
X.println(
">>> Created byte array from BigInteger to send over REST: " + Arrays.toString(bytes));
return bytes;
} else return obj;
}
/**
* Queries persons working in provided organization.
*
* @param conn JDBC
* @param orgName Organization name.
* @throws SQLException In case of SQL error.
*/
private static void queryPersonsInOrganization(Connection conn, String orgName)
throws SQLException {
PreparedStatement stmt =
conn.prepareStatement(
"select p.name from Person p, Organization o where p.orgId = o.id and o.name = ?");
stmt.setString(1, orgName);
ResultSet rs = stmt.executeQuery();
X.println(">>> Persons working in " + orgName + ":");
while (rs.next()) X.println(">>> " + rs.getString(1));
}
/**
* Prints a phrase on the grid nodes running anonymous callable objects and calculating total
* number of letters.
*
* @param phrase Phrase to print on of the grid nodes.
* @throws GridException If failed.
*/
private static void countLettersCallable(String phrase) throws GridException {
X.println(">>> Starting countLettersCallable() example...");
Collection<Callable<Integer>> calls = new HashSet<Callable<Integer>>();
for (final String word : phrase.split(" "))
calls.add(
new GridCallable<Integer>() { // Create executable logic.
@Override
public Integer call() throws Exception {
// Print out a given word, just so we can
// see which node is doing what.
X.println(">>> Executing word: " + word);
// Return the length of a given word, i.e. number of letters.
return word.length();
}
});
// Explicitly execute the collection of callable objects and receive a result.
Collection<Integer> results = G.grid().call(SPREAD, calls);
// Add up all results using convenience 'sum()' method on GridFunc class.
int letterCnt = F.sum(results);
X.println(">>>");
X.println(
">>> Finished execution of counting letters with callables based on GridGain 3.0 API.");
X.println(">>> You should see the phrase '" + phrase + "' printed out on the nodes.");
X.println(">>> Total number of letters in the phrase is '" + letterCnt + "'.");
X.println(">>> Check all nodes for output (this node is also part of the grid).");
X.println(">>>");
}
/**
* Prints a phrase on the grid nodes running anonymous closure objects and calculating total
* number of letters.
*
* @param phrase Phrase to print on of the grid nodes.
* @throws GridException If failed.
*/
private static void countLettersClosure(String phrase) throws GridException {
X.println(">>> Starting countLettersClosure() example...");
// Explicitly execute the collection of callable objects and receive a result.
Collection<Integer> results =
G.grid()
.call(
SPREAD,
new GridClosure<String, Integer>() { // Create executable logic.
@Override
public Integer apply(String word) {
// Print out a given word, just so we can
// see which node is doing what.
X.println(">>> Executing word: " + word);
// Return the length of a given word, i.e. number of letters.
return word.length();
}
},
Arrays.asList(phrase.split(" "))); // Collection of arguments for closures.
// Add up all results using convenience 'sum()' method.
int letterCnt = F.sum(results);
X.println(">>>");
X.println(">>> Finished execution of counting letters with closure based on GridGain 3.0 API.");
X.println(">>> You should see the phrase '" + phrase + "' printed out on the nodes.");
X.println(">>> Total number of letters in the phrase is '" + letterCnt + "'.");
X.println(">>> Check all nodes for output (this node is also part of the grid).");
X.println(">>>");
}
/**
* Execute {@code HelloWorld} example on the grid.
*
* @param args Command line arguments, none required but if provided first one should point to the
* Spring XML configuration file. See {@code "examples/config/"} for configuration file
* examples.
* @throws GridException If example execution failed.
*/
public static void main(String[] args) throws GridException {
if (args.length == 0) {
G.start();
} else {
G.start(args[0]);
}
try {
Grid grid = G.grid();
// Execute Hello World task.
GridTaskFuture<Integer> fut = grid.execute(GridHelloWorldTask.class, "Hello World");
// Wait for task completion.
int phraseLen = fut.get();
X.println(">>>");
X.println(">>> Finished executing Grid \"Hello World\" example with custom task.");
X.println(">>> Total number of characters in the phrase is '" + phraseLen + "'.");
X.println(">>> You should see print out of 'Hello' on one node and 'World' on another node.");
X.println(">>> Check all nodes for output (this node is also part of the grid).");
X.println(">>>");
} finally {
G.stop(true);
}
}
/**
* Prints a phrase on one of the grid nodes running anonymous runnable.
*
* @param phrase Phrase to print on one of the grid nodes.
* @throws GridException If failed.
*/
private static void unicastWordsRunnable(final String phrase) throws GridException {
X.println(">>> Starting unicastWordsRunnable() example...");
G.grid()
.run(
UNICAST,
new GridRunnable() {
@Override
public void run() {
X.println(">>> Printing phrase: " + phrase);
}
});
// NOTE:
//
// Alternatively, you can use existing closure 'F.println()' to
// print any text like so:
//
// G.grid().run(UNICAST, F.println(">>> Printing phrase: " + phrase));
//
X.println(">>>");
X.println(">>> Finished execution of runnable object based on GridGain 3.0 API.");
X.println(">>> You should see the phrase '" + phrase + "' printed out on one of the nodes.");
X.println(">>> Check all nodes for output (this node is also part of the grid).");
X.println(">>>");
}
/**
* Execute {@code HelloWorld} example grid-enabled with {@code Gridify} annotation.
*
* @param args Command line arguments, none required but if provided first one should point to the
* Spring XML configuration file. See {@code "examples/config/"} for configuration file
* examples.
* @throws GridException If example execution failed.
*/
public static void main(String[] args) throws GridException {
if (args.length == 0) {
G.start();
} else {
G.start(args[0]);
}
try {
// Simple example stateful instance to demonstrate
// how object state can be handled with grid-enabled methods.
GridifyHelloWorld helloWorld = new GridifyHelloWorld();
// Set simple state.
helloWorld.setState("Hello World");
// This method is grid-enabled and
// will be executed on remote grid nodes.
int phraseLen = helloWorld.sayIt();
X.println(">>>");
X.println(">>> Finished executing Gridify \"Hello World\" stateful example.");
X.println(">>> Total number of characters in the phrase is '" + phraseLen + "'.");
X.println(">>> You should see print out of 'Hello' on one node and 'World' on another node.");
X.println(">>> Check all nodes for output (this node is also part of the grid).");
X.println(">>>");
} finally {
G.stop(true);
}
}
/**
* Runs JDBC example.
*
* @param args Command line arguments.
* @throws Exception In case of error.
*/
public static void main(String[] args) throws Exception {
Grid grid = G.start("examples/config/spring-cache.xml");
Connection conn = null;
try {
// Populate cache with data.
populate(grid.cache(CACHE_NAME));
// Register JDBC driver.
Class.forName("org.gridgain.jdbc.GridJdbcDriver");
// Open JDBC connection.
conn =
DriverManager.getConnection("jdbc:gridgain://localhost/" + CACHE_NAME, configuration());
X.println(">>>");
// Query all persons.
queryAllPersons(conn);
X.println(">>>");
// Query person older than 30 years.
queryPersons(conn, 30);
X.println(">>>");
// Query persons working in GridGain.
queryPersonsInOrganization(conn, "GridGain");
X.println(">>>");
} finally {
// Close JDBC connection.
if (conn != null) conn.close();
G.stop(true);
}
}
/**
* Calculates length of a given phrase on the grid.
*
* @param phrase Phrase to count the number of letters in.
* @throws GridException If failed.
*/
private static void countLettersReducer(String phrase) throws GridException {
X.println(">>> Starting countLettersReducer() example...");
Grid grid = G.grid();
// Logger to use in your closure. Note that even though we assign it
// to a local variable, GridGain still allows to use it from remotely
// executed code.
final GridLogger log = grid.log();
// Execute Hello World task.
int letterCnt =
grid.reduce(
BALANCE,
new GridClosure<String, Integer>() { // Create executable logic.
@Override
public Integer apply(String word) {
// Print out a given word, just so we can
// see which node is doing what.
log.info(">>> Calculating for word: " + word);
// Return the length of a given word, i.e. number of letters.
return word.length();
}
},
Arrays.asList(phrase.split(" ")), // Collection of words.
// Create custom reducer.
// NOTE: Alternatively, you can use existing reducer: F.sumIntReducer()
new GridReducer<Integer, Integer>() {
private int sum;
@Override
public boolean collect(Integer res) {
sum += res;
return true; // True means continue collecting until last result.
}
@Override
public Integer apply() {
return sum;
}
});
X.println(">>>");
X.println(">>> Finished execution of counting letters with reducer based on GridGain 3.0 API.");
X.println(">>> Total number of letters in the phrase is '" + letterCnt + "'.");
X.println(">>> You should see individual words printed out on different nodes.");
X.println(">>> Check all nodes for output (this node is also part of the grid).");
X.println(">>>");
}
/**
* Execute {@code HelloWorld} example grid-enabled with {@code Gridify} annotation.
*
* @param args Command line arguments, none required but if provided first one should point to the
* Spring XML configuration file. See {@code "examples/config/"} for configuration file
* examples.
* @throws GridException If example execution failed.
*/
public static void main(String[] args) throws GridException {
if (args.length == 0) {
G.start();
} else {
G.start(args[0]);
}
try {
// This method will be executed on a remote grid nodes.
int phraseLen = sayIt("Hello World");
X.println(">>>");
X.println(">>> Finished executing Gridify \"Hello World\" example with custom task.");
X.println(">>> Total number of characters in the phrase is '" + phraseLen + "'.");
X.println(">>> You should see print out of 'Hello' on one node and 'World' on another node.");
X.println(">>> Check all nodes for output (this node is also part of the grid).");
X.println(">>>");
} finally {
G.stop(true);
}
}
/**
* Executes {@link GridSegmentATask} and {@link GridSegmentBTask} tasks on the grid.
*
* @param args Command line arguments, none required or used.
* @throws GridException If example execution failed.
*/
public static void main(String[] args) throws GridException {
AbstractApplicationContext ctx =
new ClassPathXmlApplicationContext("org/gridgain/examples/multispi/master.xml");
// Get configuration from Spring.
GridConfiguration cfg = ctx.getBean("grid.cfg", GridConfiguration.class);
G.start(cfg);
try {
Grid grid = G.grid();
// Execute task on segment "A".
GridTaskFuture<Integer> futA = grid.execute(GridSegmentATask.class, null);
// Execute task on segment "B".
GridTaskFuture<Integer> futB = grid.execute(GridSegmentBTask.class, null);
// Wait for task completion.
futA.get();
futB.get();
X.println(">>>");
X.println(">>> Finished executing Grid \"Multiple Topology\" example with custom tasks.");
X.println(
">>> You should see print out of 'Executing job on node that is from segment A.'"
+ "on node that has attribute \"segment=A\"");
X.println(
">>> and 'Executing job on node that is from segment B.' on node that has "
+ "attribute \"segment=B\"");
X.println(">>> Check all nodes for output (this node is not a part of the grid).");
X.println(">>>");
} finally {
G.stop(true);
}
}
/**
* Starts up grid and checks all provided values for prime.
*
* @param args Command line arguments, none required but if provided first one should point to the
* Spring XML configuration file. See {@code "examples/config/"} for configuration file
* examples.
* @throws GridException If example execution failed.
*/
public static void main(String[] args) throws GridException {
// Starts grid.
Grid grid = args.length == 0 ? G.start() : G.start(args[0]);
// Values we want to check for prime.
long[] checkVals = {32452841, 32452843, 32452847, 32452849, 236887699, 217645199};
X.println(">>>");
X.println(
">>> Starting to check the following numbers for primes: " + Arrays.toString(checkVals));
try {
long start = System.currentTimeMillis();
for (long checkVal : checkVals) {
// This method will be executed on the Grid as it is
// annotated with @Gridify annotation.
Long divisor = GridPrimeChecker.checkPrime(checkVal, 2, checkVal);
// If divisor is null, then the number is prime.
if (divisor == null) {
X.println("Value '" + checkVal + "'is a prime number.");
} else {
X.println("Value '" + checkVal + "' is divisible by '" + divisor + '\'');
}
}
long totalTime = System.currentTimeMillis() - start;
X.println(">>> Total time to calculate all primes (milliseconds): " + totalTime);
X.println(">>>");
} finally {
// Stops grid.
G.stop(grid.name(), true);
}
}
/**
* @param args Command arguments.
* @throws GridException If failed.
*/
public static void main(String[] args) throws GridException {
// Starts grid.
Grid grid = args.length == 0 ? G.start() : G.start(args[0]);
try {
// Create portfolio.
GridCredit[] portfolio = new GridCredit[5000];
Random rnd = new Random();
// Generate some test portfolio items.
for (int i = 0; i < portfolio.length; i++) {
portfolio[i] =
new GridCredit(
50000 * rnd.nextDouble(), // Credit amount.
rnd.nextInt(1000), // Credit term in days.
rnd.nextDouble() / 10, // APR.
rnd.nextDouble() / 20 + 0.02 // EDF.
);
}
// Forecast horizon in days.
int horizon = 365;
// Number of Monte-Carlo iterations.
int iter = 10000;
// Percentile.
double percentile = 0.95;
// Mark the stopwatch.
long start = System.currentTimeMillis();
// Calculate credit risk and print it out.
// As you can see the grid enabling is completely hidden from the caller
// and it is fully transparent to him. In fact, the caller is never directly
// aware if method was executed just locally or on the 100s of grid nodes.
// Credit risk crdRisk is the minimal amount that creditor has to have
// available to cover possible defaults.
double crdRisk =
grid.reduce(
SPREAD,
closures(grid.size(), portfolio, horizon, iter, percentile),
new R1<Double, Double>() {
/** Collected values sum. */
private double sum;
/** Collected values count. */
private int count;
/** {@inheritDoc} */
@Override
public boolean collect(Double e) {
sum += e;
count++;
return true;
}
/** {@inheritDoc} */
@Override
public Double apply() {
return sum / count;
}
});
X.println(
"Credit risk [crdRisk="
+ crdRisk
+ ", duration="
+ (System.currentTimeMillis() - start)
+ "ms]");
}
// We specifically don't do any error handling here to
// simplify the example. Real application may want to
// add error handling and application specific recovery.
finally {
// Stops grid.
G.stop(true);
}
}
/** {@inheritDoc} */
@Override
public void printMemoryStats() {
X.println(">>>");
X.println(">>> Task session processor memory stats [grid=" + ctx.gridName() + ']');
X.println(">>> sesMapSize: " + sesMap.size());
}
/**
* Runs basic cache example.
*
* @param args Command line arguments, none required.
* @throws Exception If example execution failed.
*/
public static void main(String[] args) throws Exception {
final Grid g =
args.length == 0 ? G.start("examples/config/spring-cache.xml") : G.start(args[0]);
try {
// Subscribe to events on every node, so we can visualize what's
// happening in remote caches.
g.run(
BROADCAST,
new CA() {
@Override
public void apply() {
GridLocalEventListener lsnr =
new GridLocalEventListener() {
@Override
public void onEvent(GridEvent event) {
switch (event.type()) {
case EVT_CACHE_OBJECT_PUT:
case EVT_CACHE_OBJECT_READ:
case EVT_CACHE_OBJECT_REMOVED:
{
GridCacheEvent e = (GridCacheEvent) event;
X.println("Cache event [name=" + e.name() + ", key=" + e.key() + ']');
}
}
}
};
GridNodeLocal<String, GridLocalEventListener> loc = g.nodeLocal();
GridLocalEventListener prev = loc.remove("lsnr");
// If there is a listener subscribed from previous runs, unsubscribe it.
if (prev != null) g.removeLocalEventListener(prev);
// Record new listener, so we can check it on next run.
loc.put("lsnr", lsnr);
// Subscribe listener.
g.addLocalEventListener(lsnr, EVTS_CACHE);
}
});
final GridCacheProjection<Integer, String> cache =
g.cache(CACHE_NAME).projection(Integer.class, String.class);
final int keyCnt = 20;
// Store keys in cache.
for (int i = 0; i < keyCnt; i++) cache.putx(i, Integer.toString(i));
// Peek and get on local node.
for (int i = 0; i < keyCnt; i++) {
X.println("Peeked [key=" + i + ", val=" + cache.peek(i) + ']');
X.println("Got [key=" + i + ", val=" + cache.get(i) + ']');
}
// Projection (view) for remote nodes.
GridProjection rmts = g.remoteProjection();
if (!rmts.isEmpty()) {
// Peek and get on remote nodes (comment it out if output gets too crowded).
g.remoteProjection()
.run(
BROADCAST,
new GridAbsClosureX() {
@Override
public void applyx() throws GridException {
for (int i = 0; i < keyCnt; i++) {
X.println("Peeked [key=" + i + ", val=" + cache.peek(i) + ']');
X.println("Got [key=" + i + ", val=" + cache.get(i) + ']');
}
}
});
}
} finally {
G.stop(true);
}
}