build: migrate from maven to gradle

.gitignore

@@ -4,6 +4,10 @@ target/
 dependency-reduced-pom.xml
 pom.xml.versionsBackup
 
+# Gradle
+build/
+.gradle
+
 # Mobile Tools for Java (J2ME)
 .mtj.tmp/
 

.travis.yml

@@ -1,13 +1,17 @@
-sudo: required
+sudo: false
 dist: trusty
-
+env:
+  global:
+    - GRADLE_USER_HOME=gradle-cache
 language: java
 jdk:
-- oraclejdk8
+  - oraclejdk8
 
 cache:
   directories:
-  - $HOME/.m2/repository
+    - gradle-cache
+    - $HOME/.gradle/caches/
+    - $HOME/.gradle/wrapper/
 
 before_install:
   # allocate commits to CI, not the owner of the deploy key
@@ -18,13 +22,16 @@ before_install:
   - git config credential.helper "store --file=.git/credentials"
   - echo "https://$GH_TOKEN:@github.com" > .git/credentials
 
+branches:
+  except:
+    - /^[0-9]/
+
 install:
-  # Override default travis to use the maven wrapper
-  - ./mvnw install -DskipTests=true -Dmaven.javadoc.skip=true -B -V
+  - ./gradlew assemble
 
 script:
-  - ./travis/publish.sh
+  - ./gradlew check
+
+#after_success:
+#  - '[ -n "$TRAVIS_TAG" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ] && ./gradlew bintrayUpload || :'
 
-branches:
-  except:
-    - /^[0-9]/

build.gradle

@@ -0,0 +1,78 @@
+//------------------------------------------------------------------------------
+// Global
+// content of this section could be placed in an other script
+//------------------------------------------------------------------------------
+plugins {
+  id "com.github.hierynomus.license" version "0.14.0"
+  id "com.jfrog.bintray" version "1.7.3"
+}
+
+
+
+allprojects {
+  apply plugin: 'license'
+  //apply plugin: 'nebula.lint'
+  //gradleLint.rules = ['all-dependency']
+
+  project.version = "git describe --always --dirty".execute().text.trim()
+  println("version : '${project.version}'")
+  group = "io.opentracing.contrib"
+  project.ext.description="OpenTracing Tracer that report traces (on logs, metrics,...)"
+  project.ext.website_url="https://github.com/opentracing-contrib/${project.name}"
+  project.ext.scm_url="https://github.com/opentracing-contrib/${project.name}"
+  project.ext.license_name="Apache-2.0" // use value of bintray license enum
+  project.ext.license_url="https://www.apache.org/licenses/LICENSE-2.0.txt"
+  project.ext.license_year=Calendar.getInstance().get(Calendar.YEAR)
+  project.ext.license_owner="The OpenTracing Authors"
+}
+
+subprojects {
+  apply plugin: 'java'
+  apply plugin: 'maven'
+
+  repositories {
+    jcenter()
+    //maven { url "https://jitpack.io" }
+  }
+
+  sourceCompatibility = JavaVersion.VERSION_1_8
+  targetCompatibility = JavaVersion.VERSION_1_8
+  [compileJava, compileTestJava]*.options*.encoding = 'UTF-8'
+
+  task sourcesJar(type: Jar) {
+    from sourceSets.main.allSource
+    classifier = 'sources'
+  }
+
+  license {
+    header = rootProject.file("src/etc/header.txt")
+    strictCheck = true
+    ext.license_year = project.license_year
+    ext.license_owner = license_owner
+    excludes(['src/test/resources/**', 'src/main/resources/**'])
+  }
+
+  task writeNewPom { doLast {
+    pom {
+      project {
+        inceptionYear project.license_year
+        description project.description
+        url project.website_url
+        licenses {
+          license {
+            name project.license_name
+            url project.license_url
+            distribution "repo"
+          }
+        }
+        developers {
+          developer {
+            id "davidB"
+            name "David Bernard"
+            url "https://github.com/davidB"
+          }
+        }
+      }
+    }.writeTo("$buildDir/newpom.xml")
+  }}
+}

gradle.properties

@@ -0,0 +1,3 @@
+v_opentracing=0.20.10
+
+

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Sat Jun 03 16:09:09 CEST 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.5-bin.zip

gradlew

@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save ( ) {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"