Learning Java 8

Reading Mastering JBoss Drools 6

Reading PL/SQL Language Reference 12c Release 1 (12.1)

Learning LPIC-1

Jcache vs Memcache

Jcache

import javax.cache.Cache;
import javax.cache.CacheException;
import javax.cache.CacheFactory;
import javax.cache.CacheManager;

try {
    CacheFactory cacheFactory = CacheManager.getInstance().getCacheFactory();
    Cache cache = cacheFactory.createCache(Collections.emptyMap());
    key = "p";
    if (cache.containsKey(key)) {
        pList = (List<p>) cache.get(key);
    } else {
        pList = ofy().load().type(p.class).list();
        cache.put(key, pList);
    }
} catch (CacheException e) {
}

Memcache

import com.google.appengine.api.memcache.ErrorHandlers;
import com.google.appengine.api.memcache.MemcacheService;
import com.google.appengine.api.memcache.MemcacheServiceFactory;

MemcacheService cache = MemcacheServiceFactory.getMemcacheService();
cache.setErrorHandler(ErrorHandlers.getConsistentLogAndContinue(Level.INFO));
key = "p";
if (cache.contains(key)) {
    pList = (List<p>) cache.get(key);
} else {
    pList = ofy().load().type(p.class).list();
    cache.put(key, pList);
}

XCOPY

Copy new/updated files from source folder on D to destination folder on K

xcopy D:\Documents\Pictures K:\Documents\Pictures /s /d

Linux Notes

uname -r: shows kernel version
lsb_release -a: shows operating system/distribution
free -m: shows memory
Ubuntu/Lubuntu/Centos/Raspberry Pi (Raspbian, Debian based distribution)

Joda-Time DateTimeFormat

import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

DateTimeFormatter formatter = DateTimeFormat.forPattern("dd/MM/yyyy HH:mm:ss");
DateTime showDate = formatter.parseDateTime("02/02/2016 08:02:00");

facebook4j Events

import facebook4j.Event;
import facebook4j.Facebook;
import facebook4j.FacebookException;
import facebook4j.FacebookFactory;
import facebook4j.ResponseList;
import facebook4j.auth.AccessToken;

Facebook facebook = new FacebookFactory().getInstance();
facebook.setOAuthAppId(appId, appSecret);
facebook.setOAuthPermissions(commaSeparetedPermissions);
facebook.setOAuthAccessToken(new AccessToken(accessToken, null));

ResponseList<Event> events;
int count;
try {
events = facebook.getEvents();
count = events.size();
} catch (FacebookException e) {
e.printStackTrace();
}

Installing MobaXterm

Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more

New Read: Understanding ECMAScript 6

Eclipse Unlimited Console Output

Eclipse UTF-8 Console

Today I Read: How to use Servlets and Ajax

 How to use Servlets and Ajax
 http://stackoverflow.com/questions/4112686/how-to-use-servlets-and-ajax/

MemcacheService, BigInteger, and Byte Array

MemcacheService syncCache = MemcacheServiceFactory.getMemcacheService();
IdentifiableValue oldValue = syncCache.getIdentifiable(key);
BigInteger.valueOf(0).toByteArray()
byte[] newValue = increment((byte[]) oldValue.getValue());
new BigInteger(newValue).intValue()
syncCache.putIfUntouched(key, oldValue, newValue)
break;
Thread.sleep(delayMs);

private byte[] increment(byte[] oldValue) {
    long val = new BigInteger(oldValue).intValue();
    val++;
    return BigInteger.valueOf(val).toByteArray();
}

Oracle decode() and sign() functions and count(*) - count(COLUMN_NAME)

decode(sign(count(*) - count(COLUMN_NAME)), 1, 'Y', 'N')

1) count(*) - count(COLUMN_NAME): returns a count of non-null records, used with group by
2) sign(NUMBER): returns sign of NUMBER
    If NUMBER < 0, then sign returns -1
    If NUMBER = 0, then sign returns 0
    If NUMBER > 0, then sign returns 1
3) decode(sign(NUMBER), 1, 'Y', 'N'): if NUMBER is greater than 0, then returns 'Y', otherwise returns 'N'

.NET Oracle Client

Method 1: Web.config
<configuration>
  <configSections>
    <section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null"/>
    <section name="oracle.dataaccess.client" type="System.Data.Common.DbProviderConfigurationHandler, System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
    <section name="oracle.manageddataaccess.client" type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342"/>
  </configSections>
  <dataConfiguration defaultDatabase="DefaultDatabase">
    <providerMappings>
      <add databaseType="Microsoft.Practices.EnterpriseLibrary.Data.DDTekOracle.OracleDatabase, Microsoft.Practices.EnterpriseLibrary.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null" name="DDTek.Oracle"/>
      <add databaseType="Microsoft.Practices.EnterpriseLibrary.Data.Oracle.OracleDatabase, Microsoft.Practices.EnterpriseLibrary.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null" name="Oracle.DataAccess.Client" />
    </providerMappings>
  </dataConfiguration>
  <connectionStrings>
    <add name="ConnectionString1" providerName="Oracle.DataAccess.Client" connectionString="User Id=;Password=;Data Source=; Pooling=true; Min Pool Size=1; Max Pool Size=50; Incr Pool Size=10; Decr Pool Size=10; Connection Timeout=50; Validate Connection=true;"/>
  </connectionStrings>
</configuration>

Method 2: Web.config
<connectionStrings>
    <add name="ConnectionString1" providerName="Oracle.ManagedDataAccess.Client" connectionString="User Id=;Password=;Data Source=; Pooling=true; Min Pool Size=1; Max Pool Size=50; Incr Pool Size=10; Decr Pool Size=10; Connection Timeout=50; Validate Connection=true;"/>
  </connectionStrings>
<system.data>
    <DbProviderFactories>
      <remove invariant="Oracle.ManagedDataAccess.Client" />
      <remove invariant="Oracle.DataAccess.Client" />
      <add name="Oracle Data Provider for .NET"
           invariant="Oracle.DataAccess.Client"
           description="Oracle Data Provider for .NET"
           type="Oracle.DataAccess.Client.OracleClientFactory, Oracle.DataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
      <add name="ODP.NET, Managed Driver"
           invariant="Oracle.ManagedDataAccess.Client"
           description="Oracle Data Provider for .NET, Managed Driver"
           type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
    </DbProviderFactories>
  </system.data>

Method 3: Machine.config
<system.data>
    <DbProviderFactories>
    <add name="ODP.NET, Managed Driver" invariant="Oracle.ManagedDataAccess.Client" description="Oracle Data Provider for .NET, Managed Driver" type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
    </DbProviderFactories>   
</system.data>

Issue: Unable to fetch transient dependency com.google.http-client:google-http-client:[1.19.0,2.0)

Issue:

Unable to fetch transient dependency com.google.http-client:google-http-client:[1.19.0,2.0)

Solution

<dependency>
        <groupId>com.google.appengine.tools</groupId>
        <artifactId>appengine-gcs-client</artifactId>
        <version>0.6</version>
        <exclusions>
            <exclusion>
                <!-- TODO remove me after the issue is fixed https://github.com/google/google-http-java-client/issues/330 -->
                <groupId>com.google.http-client</groupId>
                <artifactId>google-http-client</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

    <!-- Add the transitive dependency explicity  -->
    <dependency>
        <groupId>com.google.http-client</groupId>
        <artifactId>google-http-client</artifactId>
        <version>1.22.0</version>
    </dependency>

Bootstrap Carousel

http://www.tutorialrepublic.com/codelab.php?topic=bootstrap&file=carousel
https://bootstrapbay.com/blog/bootstrap-3-carousel-tutorial/

GAE URLFetchService, JDOM2, Amazon ItemSearch, Bytes Array to String

https://github.com/GoogleCloudPlatform/java-docs-samples/tree/master/appengine/urlfetch
http://docs.aws.amazon.com/AWSECommerceService/latest/DG/ItemSearch.html
http://stackoverflow.com/questions/4661680/how-to-read-fetch-the-xml-file-from-an-url-using-java
http://stackoverflow.com/posts/4661726/revisions
http://www.tutorialspoint.com/java_xml/java_jdom_query_document.htm
http://www.studytrails.com/java/xml/jdom2/java-xml-jdom2-xpath.jsp
http://www.tutorialspoint.com/java_xml/java_jdom_parse_document.htm
https://ikaisays.com/2010/06/29/using-asynchronous-urlfetch-on-java-app-engine/
byte[] bytes = example.getBytes();
String decoded = new String(bytes, "UTF-8");

.NET 4.5.2 TLS1.2

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319]
"SchUseStrongCrypto"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v4.0.30319]
"SchUseStrongCrypto"=dword:00000001

GAE Modules/Services

http://stackoverflow.com/questions/23055616/appengine-modules-dispatch-xml-routing-with-custom-domain
https://cloud.google.com/appengine/docs/java/config/dispatchref
https://github.com/GoogleCloudPlatform/appengine-modules-sample-java
https://cloud.google.com/appengine/docs/java/microservices-on-app-engine
https://cloud.google.com/appengine/docs/java/modules/converting

Java HashMap

Map<Integer,String> uniqueMap = new HashMap<Integer,String>();

List<Value> list = new ArrayList<Value>(map.values());

map.size() 

Installing WebLogic Server 12c

New Read: Java Cookbook, 3rd Edition