automake: setup autotools to build cephfs-java

Adds --enable-cephfs-java and --with-jdk to build
the libcephfs Java bindings and specify the default
JDK directory, respectively.

Also adds default JDK paths to avoid --with-jdk in
the common case. Currently setup for the default
provided by Debian's default-jdk package, but other
default search paths can easily be added.

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>

configure.ac

@@ -244,7 +244,80 @@ AS_IF([test "x$with_tcmalloc" != xno],
 		  [no tcmalloc found (use --without-tcmalloc to disable)])])])
 AM_CONDITIONAL(WITH_TCMALLOC, [test "$HAVE_LIBTCMALLOC" = "1"])
 
+#
+# Java is painful
+#   - adapted from OMPI wrappers package
+#   - this might become bigger. maybe should be own m4 file
+#
+AC_ARG_ENABLE(cephfs-java,
+    AC_HELP_STRING([--enable-cephfs-java], [build libcephfs Java bindings]),
+    [], [enable_cephfs_java=no])
+
+AM_CONDITIONAL(ENABLE_CEPHFS_JAVA, test "x$enable_cephfs_java" = "xyes")
+
+AC_ARG_WITH(jdk-dir,
+    AC_HELP_STRING([--with-jdk-dir(=DIR)], [Path to JDK directory]))
+
+AC_DEFUN([JAVA_DNE],
+	AC_MSG_ERROR([Cannot find $1 '$2'. Try setting --with-jdk-dir]))
+
+AS_IF([test "x$enable_cephfs_java" = "xyes"], [
+
+	# setup bin/include dirs from --with-jdk-dir (search for jni.h, javac)
+	AS_IF([test -n "$with_jdk_dir"], [
+		   javac_prog=`find $with_jdk_dir/ -name javac | head -n 1`
+		   AS_IF([test -x "$javac_prog"], [
+				  EXTRA_JDK_BIN_DIR=`dirname $javac_prog`])
+		   jnih=`find $with_jdk_dir/ -name jni.h | head -n 1`
+		   AS_IF([test -r "$jnih"], [
+				  EXTRA_JDK_INC_DIR=`dirname $jnih`])])
+
+	# setup defaults for Debian default-jdk package (without --with-jdk-dir)
+	AS_IF([test -z "$with_jdk_dir"], [
+		   # This works with Debian's default-jdk package
+		   dir='/usr/lib/jvm/default-java/'
+		   javac_prog=`find $dir -name javac | head -n 1`
+		   AS_IF([test -x "$javac_prog"], [
+				  EXTRA_JDK_BIN_DIR=`dirname $javac_prog`])
+		   jnih=`find $dir -name jni.h | head -n 1`
+		   AS_IF([test -r "$jnih"], [
+				  EXTRA_JDK_INC_DIR=`dirname $jnih`])])
+
+	# Check for Java programs: javac, javah, jar
+    PATH_save=$PATH
+	PATH="$PATH:$EXTRA_JDK_BIN_DIR"
+	AC_PATH_PROG(JAVAC, javac)
+    AC_PATH_PROG(JAVAH, javah)
+    AC_PATH_PROG(JAR, jar)
+    PATH=$PATH_save
+
+    # Ensure we have them...
+    AS_IF([test -z "$JAVAC"], JAVA_DNE(program, javac))
+    AS_IF([test -z "$JAVAH"], JAVA_DNE(program, javah))
+    AS_IF([test -z "$JAR"], JAVA_DNE(program, jar))
+
+    # Check for jni.h
+	CPPFLAGS_save=$CPPFLAGS
+
+	AS_IF([test -n "$EXTRA_JDK_INC_DIR"],
+		  [JDK_CPPFLAGS="-I$EXTRA_JDK_INC_DIR"
+		   AS_IF([test -d "$EXTRA_JDK_INC_DIR/linux"],
+				 [JDK_CPPFLAGS="$JDK_CPPFLAGS -I$EXTRA_JDK_INC_DIR/linux"])
+		   CPPFLAGS="$CPPFLAGS $JDK_CPPFLAGS"])
+
+	AC_CHECK_HEADER([jni.h], [], JAVA_DNE(header, jni.h))
+
+	CPPFLAGS=$CPPFLAGS_save
+
+	# Setup output var
+	AC_SUBST(JDK_CPPFLAGS)
+])
+
 # jni?
+# clear cache (from java above) -- this whole thing will get
+# folded into the bigger java package later -- for now maintain
+# backward compat
+AS_UNSET(ac_cv_header_jni_h)
 AC_ARG_WITH([hadoop],
             [AS_HELP_STRING([--with-hadoop], [build hadoop client])],
             [],
@@ -443,6 +516,7 @@ AC_CONFIG_FILES([Makefile
 	src/ocf/Makefile
 	src/ocf/ceph
 	src/ocf/rbd
+	src/java/Makefile
 	man/Makefile
 	ceph.spec])
 AC_OUTPUT

src/Makefile.am

@@ -1,5 +1,5 @@
 AUTOMAKE_OPTIONS = gnu
-SUBDIRS = ocf
+SUBDIRS = ocf java
 DIST_SUBDIRS = gtest ocf leveldb libs3
 
 EXTRA_DIST = \
@@ -506,6 +506,19 @@ libhadoopcephfs_la_CFLAGS = ${AM_CFLAGS}
 libhadoopcephfs_la_CXXFLAGS = ${AM_CXXFLAGS}
 libhadoopcephfs_la_LDFLAGS = ${AM_LDFLAGS} -version-info 1:0:0 -export-symbols-regex 'hadoopcephfs_.*'
 lib_LTLIBRARIES += libhadoopcephfs.la
+
+endif
+
+## CephFS Java Wrappers
+##  - The JNI library is here
+##  - The Java source Makefile.am is in src/java
+if ENABLE_CEPHFS_JAVA
+libcephfs_jni_la_SOURCES = java/native/libcephfs_jni.cc
+libcephfs_jni_la_LIBADD = libcephfs.la
+libcephfs_jni_la_CFLAGS = $(JDK_CPPFLAGS) ${AM_CFLAGS}
+libcephfs_jni_la_CXXFLAGS = $(JDK_CPPFLAGS) ${AM_CXXFLAGS}
+libcephfs_jni_la_LDFLAGS = ${AM_LDFLAGS} -version-info 1:0:0
+lib_LTLIBRARIES += libcephfs_jni.la
 endif
 
 ## key_value_store classes

src/java/.gitignore

@@ -0,0 +1,4 @@
+*.class
+libcephfs.jar
+native/com_ceph_fs_CephMount.h
+TEST-*.txt

src/java/Makefile.am

@@ -0,0 +1,43 @@
+# automake technique adapted from OpenMPI Java
+
+JAVA_SRC = \
+	java/com/ceph/fs/CephMount.java \
+	java/com/ceph/fs/CephStat.java \
+	java/com/ceph/fs/CephStatVFS.java \
+	java/com/ceph/fs/CephNativeLoader.java \
+	java/com/ceph/fs/CephNotMountedException.java
+
+EXTRA_DIST = $(JAVA_SRC)
+
+if ENABLE_CEPHFS_JAVA
+
+JAVA_CLASSES = $(JAVA_SRC:java/%.java=%.class)
+# This is dumb -- It might be better to split some work
+# between Make and Ant or Maven
+#ESCAPED_JAVA_CLASSES = \
+#	com/ceph/fs/CephMount\$$State.class
+
+JAVA_H = native/com_ceph_fs_CephMount.h
+
+# target to make automake happy
+CEPH_PROXY=java/com/ceph/fs/CephMount.class
+
+$(CEPH_PROXY): $(JAVA_SRC)
+	export CLASSPATH=java/ ;
+	$(JAVAC) java/com/ceph/fs/*.java
+
+$(JAVA_H): $(CEPH_PROXY)
+	export CLASSPATH=java/ ; \
+	$(JAVAH) -jni -o $@ com.ceph.fs.CephMount
+
+libcephfs.jar: $(CEPH_PROXY)
+	$(JAR) cf $@ $(JAVA_CLASSES:%=-C java %) # $(ESCAPED_JAVA_CLASSES:%=-C java %)
+
+javadir = $(libdir)
+java_DATA = libcephfs.jar
+
+BUILT_SOURCES = $(JAVA_H)
+
+CLEANFILES = -rf java/com/ceph/fs/*.class $(JAVA_H) libcephfs.jar
+
+endif

src/java/java/com/ceph/fs/CephException.java

@@ -1,40 +0,0 @@
-/*
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
- */
-package com.ceph.fs;
-
-/**
- * Class that represents generic Ceph exception.
- */
-public class CephException extends Exception {
-
-  /**
-   * Create basic CephException.
-   */
-  public CephException() {
-    super();
-  }
-
-  /**
-   * Create CephException with message.
-   */
-  public CephException(String s) {
-    super(s);
-  }
-}