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UCPManager.java
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/* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.*/
/*
* DESCRIPTION
*
* This code sample illustrates how applications use UCP manager's
* administration functions. These include:
*
* 1) createConnectionPool
* 2) stopConnectionPool
* 3) startConnectionPool
* 4) refreshConnectionPool
* 5) recycleConnectionPool
* 6) purgeConnectionPool
* 7) getConnectionPool
* 8) getConnectionPoolNames
* 9) destoryConnectionPool
*
* It is required that applications have both ucp.jar and Oracle JDBC
* driver jar(s) (such as ojdbc8.jar or ojdbc7.jar) on the classpath,
* and that the database backend supports SQL (this sample uses an
* Oracle Database and the default HR schema).
*
* To run the sample, you must provide non-default and working values
* for ALL 3 of user, password, and URL. This can be done by either updating
* this file directly or supplying the 3 values as command-line options
* and user input. The password is read from console or standard input.
* java UCPManager -l <url> -u <user>
* If you do not update all the defaults, the program proceeds but
* will hit error when connecting.
*/
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.sql.Connection;
import java.sql.SQLException;
import oracle.ucp.UniversalConnectionPool;
import oracle.ucp.UniversalConnectionPoolException;
import oracle.ucp.admin.UniversalConnectionPoolManager;
import oracle.ucp.admin.UniversalConnectionPoolManagerImpl;
import oracle.ucp.jdbc.PoolDataSource;
import oracle.ucp.jdbc.PoolDataSourceFactory;
import oracle.ucp.jdbc.PoolDataSourceImpl;
public class UCPManager {
final static String DEFAULT_URL = "jdbc:oracle:thin:@//myhost:myport/myservice";
final static String DEFAULT_USER = "myuser";
final static String DEFAULT_PASSWORD = "mypassword";
final static String CONN_FACTORY_CLASS = "oracle.jdbc.pool.OracleDataSource";
// You must provide non-default values for ALL 3 to execute the program
static String url = DEFAULT_URL;
static String user = DEFAULT_USER;
static String password = DEFAULT_PASSWORD;
// Shared by all methods
private PoolDataSource pds = null;
// Shared by all methods
private static UniversalConnectionPoolManager mgr = null;
final static String POOL_NAME = "UCPManager_pool";
public static void main(String args[]) throws Exception {
UCPManager sample = new UCPManager();
getRealUserPasswordUrl(args);
sample.run();
}
void run() throws Exception {
mgr = UniversalConnectionPoolManagerImpl.getUniversalConnectionPoolManager();
pds = createPoolDataSource(POOL_NAME);
demoCreateConnectionPool();
demoStartConnectionPool();
demoStopConnectionPool();
demoRefreshConnectionPool();
demoRecycleConnectionPool();
demoPurgeConnectionPool();
demoGetConnectionPool();
demoGetConnectionPoolNames();
demoDestroyConnectionPool();
}
private void demoCreateConnectionPool() {
try {
show("\n-- demoCreateConnectionPool -- ");
// Creates the embedded connection pool instance in the data source.
mgr.createConnectionPool((PoolDataSourceImpl) pds);
show("\nConnection pool " + POOL_NAME + " is created from manager");
} catch (Exception e) {
showError("demoCreateConnectionPool", e);
}
}
private void demoStartConnectionPool() {
try {
show("\n-- demoStartConnectionPool -- ");
// Starts the embedded connection pool instance.
mgr.startConnectionPool(POOL_NAME);
show("\nConnection pool " + POOL_NAME + " is started from manager");
showPoolStatistics("After pool start", pds);
} catch(Exception e) {
showError("demoStartConnectionPool", e);
}
}
private void demoStopConnectionPool() {
try {
show("\n-- demoStopConnectionPool -- ");
// Stops the embedded connection pool instance.
mgr.stopConnectionPool(POOL_NAME);
show("\nConnection pool " + POOL_NAME + " is stopped from manager");
showPoolStatistics("After pool stop", pds);
} catch (Exception e) {
showError("demoStopConnectionPool", e);
}
}
// Refreshing a connection pool replaces every connection in the pool
// with a new connection. Any borrowed connection is marked for removal
// only, and will be refreshed after the connection is returned to the pool.
private void demoRefreshConnectionPool() {
try {
show("\n-- demoRefreshConnectionPool -- ");
show("\nSets the initial pool size to 10");
pds.setInitialPoolSize(10);
show("\nBorrow a connection from the pool");
Connection con = pds.getConnection();
// There will be 9 available connections and 1 borrowed connection.
showPoolStatistics("After borrow and before pool refresh", pds);
// Refreshes the embedded connection pool instance.
mgr.refreshConnectionPool(POOL_NAME);
show("\nConnection pool " + POOL_NAME + " is refreshed from manager");
// Only available connections are immediately refreshed, so there
// will still be 9 available connections and 1 borrowed connection.
showPoolStatistics("After pool refresh", pds);
// This last connection will be refreshed after returned to pool.
show("\nReturn the borrowed connection to the pool");
con.close();
// Wait for pool to asynchronously replace connection.
Thread.sleep(20000);
showPoolStatistics("After last return", pds);
} catch (Exception e) {
showError("demoRefreshConnectionPool", e);
}
}
// Recycling a connection pool replaces only invalid connections in the pool
// with new connections and does not replace borrowed connections.
private void demoRecycleConnectionPool() {
try {
show("\n-- demoRecycleConnectionPool -- ");
showPoolStatistics("Before any action", pds);
show("\nBorrow a connection from the pool");
Connection con = pds.getConnection();
// There will be 9 available connections and 1 borrowed connection.
showPoolStatistics("After borrow and before pool recycle", pds);
// Recycles the embedded connection pool instance.
mgr.recycleConnectionPool(POOL_NAME);
show("\nConnection pool " + POOL_NAME + " is recycled from manager");
// Only invalid connections are recycled, so there will still be
// 9 available connections and 1 borrowed connection.
showPoolStatistics("After pool recycle", pds);
// Return last borrowed connection to the pool.
con.close();
// Wait for pool to asynchronously validate returned connection.
Thread.sleep(20000);
} catch (Exception e) {
showError("demoRecycleConnectionPool", e);
}
}
// Purging a connection pool removes every connection (available and
// borrowed) from the connection pool and leaves the pool empty.
private void demoPurgeConnectionPool() {
try {
show("\n-- demoPurgeConnectionPool -- ");
showPoolStatistics("Before any action", pds);
show("\nBorrow a connection from the pool");
Connection con = pds.getConnection();
// There will be 9 available connections and 1 borrowed connection.
showPoolStatistics("After borrow and before pool purge", pds);
// Purges the embedded connection pool instance.
mgr.purgeConnectionPool(POOL_NAME);
show("\nConnection pool " + POOL_NAME + " is purged from manager");
// All connections are removed, so 0 for both available and borrowed.
showPoolStatistics("After pool purge", pds);
} catch (Exception e) {
showError("demoPurgeConnectionPool", e);
}
}
private void demoGetConnectionPool() {
try {
show("\n-- demoGetConnectionPool -- ");
UniversalConnectionPool pool = mgr.getConnectionPool(POOL_NAME);
show("\nObtained UCP pool object for " + POOL_NAME +
": " + pool);
} catch (Exception e) {
showError("demoGetConnectionPool", e);
}
}
private void demoGetConnectionPoolNames() {
try {
show("\n-- demoGetConnectionPoolNames -- ");
String names[] = mgr.getConnectionPoolNames();
show("\nObtained all pool names in this UCP manager:");
for (int i = 0; i < names.length; i++) {
show("Pool [" +i +"] : " + names[i]);
}
} catch (Exception e) {
showError("demoGetConnectionPoolNames", e);
}
}
private void demoDestroyConnectionPool() {
try {
show("\n-- demoDestroyConnectionPool -- ");
showPoolStatistics("Before any action", pds);
show("\nBorrow a connection from the pool");
Connection con = pds.getConnection();
showPoolStatistics("After borrow", pds);
show("\nReturn the connection to pool");
con.close();
showPoolStatistics("After return and before pool destroy", pds);
// Destroys the embedded connection pool instance.
mgr.destroyConnectionPool(POOL_NAME);
show("\nConnection pool " + POOL_NAME + " is destroyed from manager");
try {
show("\nTry to borrow another connection from the pool ");
pds.getConnection();
} catch (Exception e) {
show("\nGot expected error, cannot borrow since pool is destroyed");
}
} catch (Exception e) {
showError("demoDestroyConnectionPool", e);
}
}
// See sample UCPBasic.java for basic steps to set up a connection pool.
PoolDataSource createPoolDataSource(String poolName) throws Exception {
PoolDataSource pds = PoolDataSourceFactory.getPoolDataSource();
pds.setConnectionFactoryClassName(CONN_FACTORY_CLASS);
pds.setURL(url);
pds.setUser(user);
pds.setPassword(password);
pds.setConnectionPoolName(poolName);
return pds;
}
void showPoolStatistics(String prompt, PoolDataSource pds)
throws SQLException {
show(prompt + " -");
show(" Available connections: " + pds.getAvailableConnectionsCount());
show(" Borrowed connections: " + pds.getBorrowedConnectionsCount());
}
static void show(String msg) {
System.out.println(msg);
}
static void showError(String msg, Throwable exc) {
System.out.println(msg + " hit error: " + exc.getMessage());
}
static void getRealUserPasswordUrl(String args[]) throws Exception {
// URL can be modified in file, or taken from command-line
url = getOptionValue(args, "-l", DEFAULT_URL);
// DB user can be modified in file, or taken from command-line
user = getOptionValue(args, "-u", DEFAULT_USER);
// DB user's password can be modified in file, or explicitly entered
readPassword(" Password for " + user + ": ");
}
// Get specified option value from command-line.
static String getOptionValue(
String args[], String optionName, String defaultVal) {
String argValue = "";
try {
int i = 0;
String arg = "";
boolean found = false;
while (i < args.length) {
arg = args[i++];
if (arg.equals(optionName)) {
if (i < args.length)
argValue = args[i++];
if (argValue.startsWith("-") || argValue.equals("")) {
argValue = defaultVal;
}
found = true;
}
}
if (!found) {
argValue = defaultVal;
}
} catch (Exception e) {
showError("getOptionValue", e);
}
return argValue;
}
static void readPassword(String prompt) throws Exception {
if (System.console() != null) {
char[] pchars = System.console().readPassword("\n[%s]", prompt);
if (pchars != null) {
password = new String(pchars);
java.util.Arrays.fill(pchars, ' ');
}
} else {
BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
show(prompt);
password = r.readLine();
}
}
}