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An EIS may provide a simple form of an adapter, where the adapter maps an API that is specific to the EIS to a reusable, standard API. Often, such an adapter is developed as a library, whereby the application developer can use the same programming language to access the adapter as she uses to write the application, and no modifications are required to the EIS. For example, a Java application developer can use a Java-based adapter an adapter written in the Java programming language to access an EIS that is based on some non-Java language or platform. An EIS adapter may be developed as a C library. For example, the code in Figure 6-2 illustrates a Java application that uses a JNI to access this C library or C-based resource adapter. The JNI is the native programming interface for Java, and it is part of the Java Developers Kit (JDK). The JNI allows Java code that runs within a Java Virtual Machine (JVM) to operate with applications and libraries written in other languages, such as C and C++. Programmers typically use the JNI to write native methods when they cannot write the entire application in Java. This is the case when a Java application needs to access an existing library or application written in another
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FIGURE 6-2
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programming language. While the JNI was especially useful before the advent of the JEE platform, some of its uses may now be replaced by the JEE Connector Architecture. As you can see in Figure 6-2, the JNI to the resource adapter enables the Java application to communicate with the adapter s C library. While this approach does work, it is complex to use. The Java application has to understand how to invoke methods through the JNI. This approach also provides none of the JEE support for transactions, security, and scalability. The developer is exposed to the complexity of managing these systemlevel services, and must do so through the complex JNI.
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public class lbUtilAd01 { public native String createUser (String pszUIDName, String pszUIDPassword, String pszFirstName,String pszLastName, String pszOrg,String pszRoot, String pszAdminName, String pszAdminPassword); static { // Load the C++ DLL System.loadLibrary("lbUtilAD01"); } public static void main(String args[]) { lbUtilAd01 AD01 = new lbUtilAd01(); AD01.createUser("Jbambara", "test1234", "Joe", "Bambara", "ou=Test OU", "dc=TRADING, dc=bank, dc=com", "administrator", "pw1234$!"); Output of JAVAH compiler: javah lbUtilad01 /* DO NOT EDIT THIS FILE - it is machine generated */ #include <jni.h> /* Header for class tacadapter_lbUtilAd01 */ #ifndef _Included_tacadapter_lbUtilAd01 #define _Included_tacadapter_lbUtilAd01 #ifdef __cplusplus
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extern "C" { #endif JNIEXPORT jstring JNICALL Java_tacadapter_lbUtilAd01_createUser (JNIEnv *, jobject, jstring, jstring, jstring, jstring, jstring, jstring, jstring, string);
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Here s the C++ program lbUtilAD01.cpp, which is called by lbUtilAD01.java:
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// lbUtilAD01.cpp: implementation of the lbUtilAD01 class. // This will CREATE user WINNT account for MS ADSI . #include "tacadapter_lbUtilAd01.h" #define _WIN32_WINNT 0x0500 extern "C" __declspec( dllexport ) LPWSTR CharStringToUnicodeString (const char *string); char *GetSID(const char *szDomainName,LPWSTR,LPWSTR,const char *szUserName,VARIANT *); // JAVA JNI interface call signature JNIEXPORT jstring JNICALL Java_tacadapter_lbUtilAd01_createUser (JNIEnv *env, jobject obj, jstring pszUIDName, jstring pszUIDPassword,jstring szFirstName,jstring pszLastName,jstring pszOrg,jstring pszRoot,jstring pszAdminName, jstring pszAdminPassword) { char strORG[1024],strRDN[1024], strFullName[1024]; HRESULT result; jstring rMessage; // convert call signature args to use in program const char *szUIDName = env -> GetStringUTFChars(pszUIDName, 0); const char *szUIDPassword = env -> GetStringUTFChars(pszUIDPassword, 0); const char *szOrg = env -> GetStringUTFChars(pszOrg, 0); const char *szRoot = env -> GetStringUTFChars(pszRoot, 0); const char *szAdminName = env -> GetStringUTFChars(pszAdminName, 0); const char *szAdminPassword = env -> GetStringUTFChars(pszAdminPassword, 0); const char *szFirstName = env -> GetStringUTFChars(pszFirstName, 0); const char *szLastName = env -> GetStringUTFChars(pszLastName, 0); IADsContainer *pContainer; IADs *pServer=NULL; IADsUser *pADuserpw=NULL; IDispatch *pDisp=NULL; LPWSTR lpADSIPath,lpUIDName,lpUIDPasswd,lpFirstName,lpLastName; LPWSTR lpOrg,lpFullName, lpRDNName; // GET ADSIPATH lpADSIPath = CharStringToUnicodeString(strORG); result = ADsOpenObject(lpADSIPath,lpAdminID,lpAdminPasswd,
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