HADOOP-9802. Merging change r1512872 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1512874 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -70,6 +70,8 @@ Release 2.1.1-beta - UNRELEASED
     HADOOP-8814. Replace string equals "" by String#isEmpty().
     (Brandon Li via suresh)
 
+    HADOOP-9802. Support Snappy codec on Windows. (cnauroth)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-common-project/hadoop-common/pom.xml

@@ -592,6 +592,13 @@
           <family>Windows</family>
         </os>
       </activation>
+      <properties>
+        <snappy.prefix></snappy.prefix>
+        <snappy.lib></snappy.lib>
+        <snappy.include></snappy.include>
+        <require.snappy>false</require.snappy>
+        <bundle.snappy.in.bin>true</bundle.snappy.in.bin>
+      </properties>
       <build>
         <plugins>
           <plugin>
@@ -676,6 +683,10 @@
                     <argument>/nologo</argument>
                     <argument>/p:Configuration=Release</argument>
                     <argument>/p:OutDir=${project.build.directory}/bin/</argument>
+                    <argument>/p:CustomSnappyPrefix=${snappy.prefix}</argument>
+                    <argument>/p:CustomSnappyLib=${snappy.lib}</argument>
+                    <argument>/p:CustomSnappyInclude=${snappy.include}</argument>
+                    <argument>/p:RequireSnappy=${require.snappy}</argument>
                   </arguments>
                 </configuration>
               </execution>

hadoop-common-project/hadoop-common/src/main/native/native.vcxproj

@@ -17,7 +17,7 @@
    limitations under the License.
 -->
 
-<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project DefaultTargets="CheckRequireSnappy;Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Release|x64">
       <Configuration>Release</Configuration>
@@ -49,6 +49,21 @@
     <IntDir>..\..\..\target\native\$(Configuration)\</IntDir>
     <TargetName>hadoop</TargetName>
   </PropertyGroup>
+  <PropertyGroup>
+    <SnappyLib Condition="Exists('$(CustomSnappyPrefix)\snappy.dll')">$(CustomSnappyPrefix)</SnappyLib>
+    <SnappyLib Condition="Exists('$(CustomSnappyPrefix)\lib\snappy.dll') And '$(SnappyLib)' == ''">$(CustomSnappyPrefix)\lib</SnappyLib>
+    <SnappyLib Condition="Exists('$(CustomSnappyLib)') And '$(SnappyLib)' == ''">$(CustomSnappyLib)</SnappyLib>
+    <SnappyInclude Condition="Exists('$(CustomSnappyPrefix)\snappy.h')">$(CustomSnappyPrefix)</SnappyInclude>
+    <SnappyInclude Condition="Exists('$(CustomSnappyPrefix)\include\snappy.h') And '$(SnappyInclude)' == ''">$(CustomSnappyPrefix)\include</SnappyInclude>
+    <SnappyInclude Condition="Exists('$(CustomSnappyInclude)') And '$(SnappyInclude)' == ''">$(CustomSnappyInclude)</SnappyInclude>
+    <SnappyEnabled Condition="'$(SnappyLib)' != '' And '$(SnappyInclude)' != ''">true</SnappyEnabled>
+    <IncludePath Condition="'$(SnappyEnabled)' == 'true'">$(SnappyInclude);$(IncludePath)</IncludePath>
+  </PropertyGroup>
+  <Target Name="CheckRequireSnappy">
+    <Error
+      Text="Required snappy library could not be found.  SnappyLibrary=$(SnappyLibrary), SnappyInclude=$(SnappyInclude), CustomSnappyLib=$(CustomSnappyLib), CustomSnappyInclude=$(CustomSnappyInclude), CustomSnappyPrefix=$(CustomSnappyPrefix)"
+      Condition="'$(RequireSnappy)' == 'true' And '$(SnappyEnabled)' != 'true'" />
+  </Target>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -71,6 +86,12 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClCompile Include="src\org\apache\hadoop\io\compress\snappy\SnappyCompressor.c" Condition="'$(SnappyEnabled)' == 'true'">
+      <AdditionalOptions>/D HADOOP_SNAPPY_LIBRARY=L\"snappy.dll\"</AdditionalOptions>
+    </ClCompile>
+    <ClCompile Include="src\org\apache\hadoop\io\compress\snappy\SnappyDecompressor.c" Condition="'$(SnappyEnabled)' == 'true'">
+      <AdditionalOptions>/D HADOOP_SNAPPY_LIBRARY=L\"snappy.dll\"</AdditionalOptions>
+    </ClCompile>
     <ClCompile Include="src\org\apache\hadoop\io\compress\lz4\lz4.c" />
     <ClCompile Include="src\org\apache\hadoop\io\compress\lz4\lz4hc.c" />
     <ClCompile Include="src\org\apache\hadoop\io\compress\lz4\Lz4Compressor.c" />
@@ -79,12 +100,15 @@
     <ClCompile Include="src\org\apache\hadoop\io\nativeio\NativeIO.c" />
     <ClCompile Include="src\org\apache\hadoop\security\JniBasedUnixGroupsMappingWin.c" />
     <ClCompile Include="src\org\apache\hadoop\util\bulk_crc32.c" />
-    <ClCompile Include="src\org\apache\hadoop\util\NativeCodeLoader.c" />
+    <ClCompile Include="src\org\apache\hadoop\util\NativeCodeLoader.c">
+      <AdditionalOptions Condition="'$(SnappyEnabled)' == 'true'">/D HADOOP_SNAPPY_LIBRARY=L\"snappy.dll\"</AdditionalOptions>
+    </ClCompile>
     <ClCompile Include="src\org\apache\hadoop\util\NativeCrc32.c" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\src\org\apache\hadoop\util\crc32c_tables.h" />
     <ClInclude Include="..\src\org\apache\hadoop\util\crc32_zlib_polynomial_tables.h" />
+    <ClInclude Include="src\org\apache\hadoop\io\compress\snappy\org_apache_hadoop_io_compress_snappy.h" />
     <ClInclude Include="src\org\apache\hadoop\io\nativeio\file_descriptor.h" />
     <ClInclude Include="src\org\apache\hadoop\util\bulk_crc32.h" />
     <ClInclude Include="src\org\apache\hadoop\util\crc32c_tables.h" />

hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/snappy/SnappyCompressor.c

@@ -30,6 +30,10 @@
 #include "config.h"
 #endif // UNIX
 
+#ifdef WINDOWS
+#include "winutils.h"
+#endif
+
 #include "org_apache_hadoop_io_compress_snappy_SnappyCompressor.h"
 
 #define JINT_MAX 0x7fffffff
@@ -40,11 +44,18 @@ static jfieldID SnappyCompressor_uncompressedDirectBufLen;
 static jfieldID SnappyCompressor_compressedDirectBuf;
 static jfieldID SnappyCompressor_directBufferSize;
 
+#ifdef UNIX
 static snappy_status (*dlsym_snappy_compress)(const char*, size_t, char*, size_t*);
+#endif
+
+#ifdef WINDOWS
+typedef snappy_status (__cdecl *__dlsym_snappy_compress)(const char*, size_t, char*, size_t*);
+static __dlsym_snappy_compress dlsym_snappy_compress;
+#endif
 
 JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_snappy_SnappyCompressor_initIDs
 (JNIEnv *env, jclass clazz){
-
+#ifdef UNIX
   // Load libsnappy.so
   void *libsnappy = dlopen(HADOOP_SNAPPY_LIBRARY, RTLD_LAZY | RTLD_GLOBAL);
   if (!libsnappy) {
@@ -53,10 +64,25 @@ JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_snappy_SnappyCompresso
     THROW(env, "java/lang/UnsatisfiedLinkError", msg);
     return;
   }
+#endif
+
+#ifdef WINDOWS
+  HMODULE libsnappy = LoadLibrary(HADOOP_SNAPPY_LIBRARY);
+  if (!libsnappy) {
+    THROW(env, "java/lang/UnsatisfiedLinkError", "Cannot load snappy.dll");
+    return;
+  }
+#endif
 
   // Locate the requisite symbols from libsnappy.so
+#ifdef UNIX
   dlerror();                                 // Clear any existing error
   LOAD_DYNAMIC_SYMBOL(dlsym_snappy_compress, env, libsnappy, "snappy_compress");
+#endif
+
+#ifdef WINDOWS
+  LOAD_DYNAMIC_SYMBOL(__dlsym_snappy_compress, dlsym_snappy_compress, env, libsnappy, "snappy_compress");
+#endif
 
   SnappyCompressor_clazz = (*env)->GetStaticFieldID(env, clazz, "clazz",
                                                  "Ljava/lang/Class;");
@@ -74,6 +100,9 @@ JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_snappy_SnappyCompresso
 
 JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_snappy_SnappyCompressor_compressBytesDirect
 (JNIEnv *env, jobject thisj){
+  const char* uncompressed_bytes;
+  char* compressed_bytes;
+  snappy_status ret;
   // Get members of SnappyCompressor
   jobject clazz = (*env)->GetStaticObjectField(env, thisj, SnappyCompressor_clazz);
   jobject uncompressed_direct_buf = (*env)->GetObjectField(env, thisj, SnappyCompressor_uncompressedDirectBuf);
@@ -84,7 +113,7 @@ JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_snappy_SnappyCompresso
 
   // Get the input direct buffer
   LOCK_CLASS(env, clazz, "SnappyCompressor");
-  const char* uncompressed_bytes = (const char*)(*env)->GetDirectBufferAddress(env, uncompressed_direct_buf);
+  uncompressed_bytes = (const char*)(*env)->GetDirectBufferAddress(env, uncompressed_direct_buf);
   UNLOCK_CLASS(env, clazz, "SnappyCompressor");
 
   if (uncompressed_bytes == 0) {
@@ -93,7 +122,7 @@ JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_snappy_SnappyCompresso
 
   // Get the output direct buffer
   LOCK_CLASS(env, clazz, "SnappyCompressor");
-  char* compressed_bytes = (char *)(*env)->GetDirectBufferAddress(env, compressed_direct_buf);
+  compressed_bytes = (char *)(*env)->GetDirectBufferAddress(env, compressed_direct_buf);
   UNLOCK_CLASS(env, clazz, "SnappyCompressor");
 
   if (compressed_bytes == 0) {
@@ -102,8 +131,8 @@ JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_snappy_SnappyCompresso
 
   /* size_t should always be 4 bytes or larger. */
   buf_len = (size_t)compressed_direct_buf_len;
-  snappy_status ret = dlsym_snappy_compress(uncompressed_bytes,
+  ret = dlsym_snappy_compress(uncompressed_bytes, uncompressed_direct_buf_len,
-        uncompressed_direct_buf_len, compressed_bytes, &buf_len);
+        compressed_bytes, &buf_len);
   if (ret != SNAPPY_OK){
     THROW(env, "Ljava/lang/InternalError", "Could not compress data. Buffer length is too small.");
     return 0;
@@ -128,8 +157,18 @@ Java_org_apache_hadoop_io_compress_snappy_SnappyCompressor_getLibraryName(JNIEnv
       return (*env)->NewStringUTF(env, dl_info.dli_fname);
     }
   }
-#endif
-  return (*env)->NewStringUTF(env, HADOOP_SNAPPY_LIBRARY);
-}
 
+  return (*env)->NewStringUTF(env, HADOOP_SNAPPY_LIBRARY);
+#endif
+
+#ifdef WINDOWS
+  LPWSTR filename = NULL;
+  GetLibraryName(dlsym_snappy_compress, &filename);
+  if (filename != NULL) {
+    return (*env)->NewString(env, filename, (jsize) wcslen(filename));
+  } else {
+    return (*env)->NewStringUTF(env, "Unavailable");
+  }
+#endif
+}
 #endif //define HADOOP_SNAPPY_LIBRARY

hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/snappy/SnappyDecompressor.c

@@ -37,12 +37,20 @@ static jfieldID SnappyDecompressor_compressedDirectBufLen;
 static jfieldID SnappyDecompressor_uncompressedDirectBuf;
 static jfieldID SnappyDecompressor_directBufferSize;
 
+#ifdef UNIX
 static snappy_status (*dlsym_snappy_uncompress)(const char*, size_t, char*, size_t*);
+#endif
+
+#ifdef WINDOWS
+typedef snappy_status (__cdecl *__dlsym_snappy_uncompress)(const char*, size_t, char*, size_t*);
+static __dlsym_snappy_uncompress dlsym_snappy_uncompress;
+#endif
 
 JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_snappy_SnappyDecompressor_initIDs
 (JNIEnv *env, jclass clazz){
 
   // Load libsnappy.so
+#ifdef UNIX
   void *libsnappy = dlopen(HADOOP_SNAPPY_LIBRARY, RTLD_LAZY | RTLD_GLOBAL);
   if (!libsnappy) {
     char* msg = (char*)malloc(1000);
@@ -50,11 +58,27 @@ JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_snappy_SnappyDecompres
     THROW(env, "java/lang/UnsatisfiedLinkError", msg);
     return;
   }
+#endif
+
+#ifdef WINDOWS
+  HMODULE libsnappy = LoadLibrary(HADOOP_SNAPPY_LIBRARY);
+  if (!libsnappy) {
+    THROW(env, "java/lang/UnsatisfiedLinkError", "Cannot load snappy.dll");
+    return;
+  }
+#endif
 
   // Locate the requisite symbols from libsnappy.so
+#ifdef UNIX
   dlerror();                                 // Clear any existing error
   LOAD_DYNAMIC_SYMBOL(dlsym_snappy_uncompress, env, libsnappy, "snappy_uncompress");
 
+#endif
+
+#ifdef WINDOWS
+  LOAD_DYNAMIC_SYMBOL(__dlsym_snappy_uncompress, dlsym_snappy_uncompress, env, libsnappy, "snappy_uncompress");
+#endif
+
   SnappyDecompressor_clazz = (*env)->GetStaticFieldID(env, clazz, "clazz",
                                                    "Ljava/lang/Class;");
   SnappyDecompressor_compressedDirectBuf = (*env)->GetFieldID(env,clazz,
@@ -71,6 +95,9 @@ JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_snappy_SnappyDecompres
 
 JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_snappy_SnappyDecompressor_decompressBytesDirect
 (JNIEnv *env, jobject thisj){
+  const char* compressed_bytes = NULL;
+  char* uncompressed_bytes = NULL;
+  snappy_status ret;
   // Get members of SnappyDecompressor
   jobject clazz = (*env)->GetStaticObjectField(env,thisj, SnappyDecompressor_clazz);
   jobject compressed_direct_buf = (*env)->GetObjectField(env,thisj, SnappyDecompressor_compressedDirectBuf);
@@ -80,7 +107,7 @@ JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_snappy_SnappyDecompres
 
   // Get the input direct buffer
   LOCK_CLASS(env, clazz, "SnappyDecompressor");
-  const char* compressed_bytes = (const char*)(*env)->GetDirectBufferAddress(env, compressed_direct_buf);
+  compressed_bytes = (const char*)(*env)->GetDirectBufferAddress(env, compressed_direct_buf);
   UNLOCK_CLASS(env, clazz, "SnappyDecompressor");
 
   if (compressed_bytes == 0) {
@@ -89,14 +116,15 @@ JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_snappy_SnappyDecompres
 
   // Get the output direct buffer
   LOCK_CLASS(env, clazz, "SnappyDecompressor");
-  char* uncompressed_bytes = (char *)(*env)->GetDirectBufferAddress(env, uncompressed_direct_buf);
+  uncompressed_bytes = (char *)(*env)->GetDirectBufferAddress(env, uncompressed_direct_buf);
   UNLOCK_CLASS(env, clazz, "SnappyDecompressor");
 
   if (uncompressed_bytes == 0) {
     return (jint)0;
   }
 
-  snappy_status ret = dlsym_snappy_uncompress(compressed_bytes, compressed_direct_buf_len, uncompressed_bytes, &uncompressed_direct_buf_len);
+  ret = dlsym_snappy_uncompress(compressed_bytes, compressed_direct_buf_len,
+        uncompressed_bytes, &uncompressed_direct_buf_len);
   if (ret == SNAPPY_BUFFER_TOO_SMALL){
     THROW(env, "Ljava/lang/InternalError", "Could not decompress data. Buffer length is too small.");
   } else if (ret == SNAPPY_INVALID_INPUT){

hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/snappy/org_apache_hadoop_io_compress_snappy.h

@@ -21,7 +21,11 @@
 #define ORG_APACHE_HADOOP_IO_COMPRESS_SNAPPY_SNAPPY_H
 
 #include "org_apache_hadoop.h"
+
+#ifdef UNIX
 #include <dlfcn.h>
+#endif
+
 #include <jni.h>
 #include <snappy-c.h>
 #include <stddef.h>

hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/util/NativeCodeLoader.c

@@ -23,6 +23,10 @@
 #include "config.h"
 #endif // UNIX
 
+#ifdef WINDOWS
+#include "winutils.h"
+#endif
+
 #include <jni.h>
 
 JNIEXPORT jboolean JNICALL Java_org_apache_hadoop_util_NativeCodeLoader_buildSupportsSnappy
@@ -47,32 +51,16 @@ JNIEXPORT jstring JNICALL Java_org_apache_hadoop_util_NativeCodeLoader_getLibrar
 #endif
 
 #ifdef WINDOWS
-  SIZE_T ret = 0;
-  DWORD size = MAX_PATH;
   LPWSTR filename = NULL;
-  HMODULE mod = NULL;
+  GetLibraryName(Java_org_apache_hadoop_util_NativeCodeLoader_getLibraryName,
-  DWORD err = ERROR_SUCCESS;
+    &filename);
-
+  if (filename != NULL)
-  MEMORY_BASIC_INFORMATION mbi;
+  {
-  ret = VirtualQuery(Java_org_apache_hadoop_util_NativeCodeLoader_getLibraryName,
+    return (*env)->NewString(env, filename, (jsize) wcslen(filename));
-    &mbi, sizeof(mbi));
+  }
-  if (ret == 0) goto cleanup;
+  else
-  mod = mbi.AllocationBase;
+  {
-
+    return (*env)->NewStringUTF(env, "Unavailable");
-  do {
+  }
-    filename = (LPWSTR) realloc(filename, size * sizeof(WCHAR));
-    if (filename == NULL) goto cleanup;
-    GetModuleFileName(mod, filename, size);
-    size <<= 1;
-    err = GetLastError();
-  } while (err == ERROR_INSUFFICIENT_BUFFER);
-  
-  if (err != ERROR_SUCCESS) goto cleanup;
-
-  return (*env)->NewString(env, filename, (jsize) wcslen(filename));
-
-cleanup:
-  if (filename != NULL) free(filename);
-  return (*env)->NewStringUTF(env, "Unavailable");
 #endif
 }

hadoop-common-project/hadoop-common/src/main/winutils/include/winutils.h

@@ -153,4 +153,6 @@ DWORD ChangeFileModeByMask(__in LPCWSTR path, INT mode);
 DWORD GetLocalGroupsForUser(__in LPCWSTR user,
   __out LPLOCALGROUP_USERS_INFO_0 *groups, __out LPDWORD entries);
 
-BOOL EnablePrivilege(__in LPCWSTR privilegeName);
+BOOL EnablePrivilege(__in LPCWSTR privilegeName);
+
+void GetLibraryName(__in LPCVOID lpAddress, __out LPWSTR *filename);

hadoop-common-project/hadoop-common/src/main/winutils/libwinutils.c

@@ -1709,3 +1709,51 @@ void ReportErrorCode(LPCWSTR func, DWORD err)
   }
   if (msg != NULL) LocalFree(msg);
 }
+
+//----------------------------------------------------------------------------
+// Function: GetLibraryName
+//
+// Description:
+//  Given an address, get the file name of the library from which it was loaded.
+//
+// Returns:
+//  None
+//
+// Notes:
+// - The function allocates heap memory and points the filename out parameter to
+//   the newly allocated memory, which will contain the name of the file.
+//
+// - If there is any failure, then the function frees the heap memory it
+//   allocated and sets the filename out parameter to NULL.
+//
+void GetLibraryName(LPCVOID lpAddress, LPWSTR *filename)
+{
+  SIZE_T ret = 0;
+  DWORD size = MAX_PATH;
+  HMODULE mod = NULL;
+  DWORD err = ERROR_SUCCESS;
+
+  MEMORY_BASIC_INFORMATION mbi;
+  ret = VirtualQuery(lpAddress, &mbi, sizeof(mbi));
+  if (ret == 0) goto cleanup;
+  mod = mbi.AllocationBase;
+
+  do {
+    *filename = (LPWSTR) realloc(*filename, size * sizeof(WCHAR));
+    if (*filename == NULL) goto cleanup;
+    GetModuleFileName(mod, *filename, size);
+    size <<= 1;
+    err = GetLastError();
+  } while (err == ERROR_INSUFFICIENT_BUFFER);
+
+  if (err != ERROR_SUCCESS) goto cleanup;
+
+  return;
+
+cleanup:
+  if (*filename != NULL)
+  {
+    free(*filename);
+    *filename = NULL;
+  }
+}

hadoop-project-dist/pom.xml

@@ -40,6 +40,7 @@
 
     <hadoop.component>UNDEF</hadoop.component>
     <bundle.snappy>false</bundle.snappy>
+    <bundle.snappy.in.bin>false</bundle.snappy.in.bin>
   </properties>
   
   <dependencies>
@@ -355,6 +356,12 @@
                         mkdir -p $${TARGET_BIN_DIR}
                         cd $${BIN_DIR}
                         $$TAR * | (cd $${TARGET_BIN_DIR}/; $$UNTAR)
+                        if [ "${bundle.snappy.in.bin}" = "true" ] ; then
+                          if [ "${bundle.snappy}" = "true" ] ; then
+                            cd ${snappy.lib}
+                            $$TAR *snappy* | (cd $${TARGET_BIN_DIR}/; $$UNTAR)
+                          fi
+                        fi
                       fi
                     </echo>
                     <exec executable="sh" dir="${project.build.directory}" failonerror="true">

hadoop-project/pom.xml

@@ -929,6 +929,7 @@
         <!-- will use a native entropy provider.  This will not really -->
         <!-- attempt to open a file at this path. -->
         <java.security.egd>file:/dev/urandom</java.security.egd>
+        <bundle.snappy.in.bin>true</bundle.snappy.in.bin>
       </properties>
       <build>
         <plugins>
@@ -938,7 +939,7 @@
             <configuration>
               <environmentVariables>
                 <!-- Specify where to look for the native DLL on Windows -->
-                <PATH>${env.PATH};${hadoop.common.build.dir}/bin</PATH>
+                <PATH>${env.PATH};${hadoop.common.build.dir}/bin;${snappy.lib}</PATH>
               </environmentVariables>
             </configuration>
           </plugin>