Add default cache implementation (BasicMemoryCache)
This commit is contained in:
FyloZ
commit
8060ded947
GPG Key ID:
835378AE9AF4AE97
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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## Other directories
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.gradle/
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build/
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logs/
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data/
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dokka/
|
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dist/
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out/
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## Prevent ignoring the gradle wrapper
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!gradle-wrapper.jar
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group = "dev.fyloz"
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version = "1.0"
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plugins {
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id("org.jetbrains.kotlin.jvm") version "1.6.10"
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}
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|
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repositories {
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mavenCentral()
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|
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maven {
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url = uri("https://archiva.fyloz.dev/repository/internal")
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}
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}
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dependencies {
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implementation("org.jetbrains.kotlin:kotlin-stdlib:1.6.10")
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testImplementation("io.kotest:kotest-runner-junit5:5.1.0")
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testImplementation("io.kotest:kotest-assertions-core:5.1.0")
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testImplementation("io.mockk:mockk:1.12.2")
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}
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tasks.withType<Test> {
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useJUnitPlatform()
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}
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kotlin.code.style=official
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Binary file not shown.
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@ -0,0 +1,5 @@
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distributionBase=GRADLE_USER_HOME
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distributionPath=wrapper/dists
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distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
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zipStoreBase=GRADLE_USER_HOME
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zipStorePath=wrapper/dists
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@ -0,0 +1,185 @@
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#!/usr/bin/env sh
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#
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# Copyright 2015 the original author or authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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##############################################################################
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##
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## Gradle start up script for UN*X
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##
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##############################################################################
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# Attempt to set APP_HOME
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# Resolve links: $0 may be a link
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PRG="$0"
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# Need this for relative symlinks.
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while [ -h "$PRG" ] ; do
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ls=`ls -ld "$PRG"`
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link=`expr "$ls" : '.*-> \(.*\)$'`
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if expr "$link" : '/.*' > /dev/null; then
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PRG="$link"
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else
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PRG=`dirname "$PRG"`"/$link"
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fi
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done
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SAVED="`pwd`"
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cd "`dirname \"$PRG\"`/" >/dev/null
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APP_HOME="`pwd -P`"
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cd "$SAVED" >/dev/null
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APP_NAME="Gradle"
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APP_BASE_NAME=`basename "$0"`
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# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
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DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
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# Use the maximum available, or set MAX_FD != -1 to use that value.
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MAX_FD="maximum"
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warn () {
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echo "$*"
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}
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die () {
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echo
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echo "$*"
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echo
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exit 1
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}
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# OS specific support (must be 'true' or 'false').
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cygwin=false
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msys=false
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darwin=false
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nonstop=false
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case "`uname`" in
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CYGWIN* )
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cygwin=true
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;;
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Darwin* )
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darwin=true
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;;
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MSYS* | MINGW* )
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msys=true
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;;
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NONSTOP* )
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nonstop=true
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;;
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esac
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CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
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# Determine the Java command to use to start the JVM.
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if [ -n "$JAVA_HOME" ] ; then
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if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
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# IBM's JDK on AIX uses strange locations for the executables
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JAVACMD="$JAVA_HOME/jre/sh/java"
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else
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JAVACMD="$JAVA_HOME/bin/java"
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fi
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if [ ! -x "$JAVACMD" ] ; then
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die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
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Please set the JAVA_HOME variable in your environment to match the
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location of your Java installation."
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fi
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else
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JAVACMD="java"
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which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
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Please set the JAVA_HOME variable in your environment to match the
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location of your Java installation."
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fi
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# Increase the maximum file descriptors if we can.
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if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
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MAX_FD_LIMIT=`ulimit -H -n`
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if [ $? -eq 0 ] ; then
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if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
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MAX_FD="$MAX_FD_LIMIT"
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fi
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ulimit -n $MAX_FD
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if [ $? -ne 0 ] ; then
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warn "Could not set maximum file descriptor limit: $MAX_FD"
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fi
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else
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warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
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fi
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fi
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# For Darwin, add options to specify how the application appears in the dock
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if $darwin; then
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GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
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fi
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# For Cygwin or MSYS, switch paths to Windows format before running java
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if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
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APP_HOME=`cygpath --path --mixed "$APP_HOME"`
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CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
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JAVACMD=`cygpath --unix "$JAVACMD"`
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# We build the pattern for arguments to be converted via cygpath
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ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
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SEP=""
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for dir in $ROOTDIRSRAW ; do
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ROOTDIRS="$ROOTDIRS$SEP$dir"
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SEP="|"
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done
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OURCYGPATTERN="(^($ROOTDIRS))"
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# Add a user-defined pattern to the cygpath arguments
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if [ "$GRADLE_CYGPATTERN" != "" ] ; then
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OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
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fi
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# Now convert the arguments - kludge to limit ourselves to /bin/sh
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i=0
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for arg in "$@" ; do
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CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
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CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
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if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
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eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
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else
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eval `echo args$i`="\"$arg\""
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fi
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i=`expr $i + 1`
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done
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case $i in
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0) set -- ;;
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1) set -- "$args0" ;;
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2) set -- "$args0" "$args1" ;;
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3) set -- "$args0" "$args1" "$args2" ;;
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4) set -- "$args0" "$args1" "$args2" "$args3" ;;
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5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
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6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
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7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
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8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
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9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
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esac
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fi
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# Escape application args
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save () {
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for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
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echo " "
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}
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APP_ARGS=`save "$@"`
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# Collect all arguments for the java command, following the shell quoting and substitution rules
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eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
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exec "$JAVACMD" "$@"
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@ -0,0 +1,89 @@
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@rem
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@rem Copyright 2015 the original author or authors.
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@rem
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@rem Licensed under the Apache License, Version 2.0 (the "License");
|
||||
@rem you may not use this file except in compliance with the License.
|
||||
@rem You may obtain a copy of the License at
|
||||
@rem
|
||||
@rem https://www.apache.org/licenses/LICENSE-2.0
|
||||
@rem
|
||||
@rem Unless required by applicable law or agreed to in writing, software
|
||||
@rem distributed under the License is distributed on an "AS IS" BASIS,
|
||||
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
@rem See the License for the specific language governing permissions and
|
||||
@rem limitations under the License.
|
||||
@rem
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|
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@if "%DEBUG%" == "" @echo off
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@rem ##########################################################################
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@rem
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@rem Gradle startup script for Windows
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@rem
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@rem ##########################################################################
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@rem Set local scope for the variables with windows NT shell
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if "%OS%"=="Windows_NT" setlocal
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set DIRNAME=%~dp0
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if "%DIRNAME%" == "" set DIRNAME=.
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set APP_BASE_NAME=%~n0
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set APP_HOME=%DIRNAME%
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@rem Resolve any "." and ".." in APP_HOME to make it shorter.
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for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
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@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
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set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
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@rem Find java.exe
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if defined JAVA_HOME goto findJavaFromJavaHome
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set JAVA_EXE=java.exe
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%JAVA_EXE% -version >NUL 2>&1
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if "%ERRORLEVEL%" == "0" goto execute
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|
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echo.
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echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
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echo.
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echo Please set the JAVA_HOME variable in your environment to match the
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echo location of your Java installation.
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goto fail
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:findJavaFromJavaHome
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set JAVA_HOME=%JAVA_HOME:"=%
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set JAVA_EXE=%JAVA_HOME%/bin/java.exe
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if exist "%JAVA_EXE%" goto execute
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|
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echo.
|
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echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
|
||||
echo.
|
||||
echo Please set the JAVA_HOME variable in your environment to match the
|
||||
echo location of your Java installation.
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|
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goto fail
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|
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:execute
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@rem Setup the command line
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set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
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|
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@rem Execute Gradle
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"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
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|
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:end
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@rem End local scope for the variables with windows NT shell
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||||
if "%ERRORLEVEL%"=="0" goto mainEnd
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|
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:fail
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||||
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
|
||||
rem the _cmd.exe /c_ return code!
|
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if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
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||||
exit /b 1
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|
||||
:mainEnd
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if "%OS%"=="Windows_NT" endlocal
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:omega
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@ -0,0 +1,2 @@
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rootProject.name = "memorycache"
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@ -0,0 +1,34 @@
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package dev.fyloz.memorycache
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abstract class BaseMemoryCache<K, V>(
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protected val map: MutableMap<K, V> = hashMapOf()
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) : MemoryCache<K, V> {
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override fun contains(key: K) =
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key in map
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override fun get(key: K): V? =
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map[key]
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override fun getNotNull(key: K): V {
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if (key !in this) {
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throw KeyNotFoundException(key)
|
||||
}
|
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|
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return get(key)!!
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}
|
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|
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override fun set(key: K, value: V) {
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map[key] = value
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}
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|
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override fun remove(key: K) {
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map.remove(key)
|
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}
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|
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override fun clear() {
|
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map.clear()
|
||||
}
|
||||
}
|
||||
|
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internal class KeyNotFoundException(val key: Any?) :
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RuntimeException("The cache doesn't contains the requested key '$key'")
|
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@ -0,0 +1,50 @@
|
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package dev.fyloz.memorycache
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||||
|
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import java.util.*
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||||
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private const val defaultCacheCapacity = 1000
|
||||
|
||||
/**
|
||||
* A basic key-value memory cache with a limited size.
|
||||
*
|
||||
* When full, the oldest key-value pair will be removed from the cache.
|
||||
*
|
||||
* @param K The type of the keys.
|
||||
* @param V The type of the values.
|
||||
* @property capacity The capacity of the cache, which is 1000 by default.
|
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*/
|
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class BasicMemoryCache<K, V>(
|
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private val capacity: Int = defaultCacheCapacity,
|
||||
) : BaseMemoryCache<K, V>() {
|
||||
private val keys = LinkedList<K>()
|
||||
|
||||
override fun contains(key: K) =
|
||||
key in keys
|
||||
|
||||
override fun set(key: K, value: V) {
|
||||
cleanup()
|
||||
|
||||
super.set(key, value)
|
||||
keys.add(key)
|
||||
}
|
||||
|
||||
override fun remove(key: K) {
|
||||
super.remove(key)
|
||||
keys.remove(key)
|
||||
}
|
||||
|
||||
override fun clear() {
|
||||
super.clear()
|
||||
keys.clear()
|
||||
}
|
||||
|
||||
private fun cleanup() {
|
||||
if (keys.size < capacity) {
|
||||
return
|
||||
}
|
||||
|
||||
// Remove the oldest key when the capacity is exceeded, aka the first in the keys linked list
|
||||
val oldestKey = keys.pop()
|
||||
remove(oldestKey)
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,27 @@
|
|||
package dev.fyloz.memorycache
|
||||
|
||||
/**
|
||||
* Represents a key-value cache whose data is stored in memory.
|
||||
*
|
||||
* @param K The type of the keys.
|
||||
* @param V The type of the values.
|
||||
*/
|
||||
interface MemoryCache<K, V> {
|
||||
/** Checks if a value correspond to the given [key]. */
|
||||
operator fun contains(key: K): Boolean
|
||||
|
||||
/** Gets the value corresponding to the given [key], or null if there is none. */
|
||||
operator fun get(key: K): V?
|
||||
|
||||
/** Gets the value corresponding to the given [key]. */
|
||||
fun getNotNull(key: K): V
|
||||
|
||||
/** Associates the [value] with the given [key]. The previous value associated with the [key] will be replaced. */
|
||||
operator fun set(key: K, value: V)
|
||||
|
||||
/** Removes the value corresponding to the given [key]. */
|
||||
fun remove(key: K)
|
||||
|
||||
/** Removes all the cached data. */
|
||||
fun clear()
|
||||
}
|
||||
|
|
@ -0,0 +1,162 @@
|
|||
package dev.fyloz.memorycache
|
||||
|
||||
import io.kotest.assertions.throwables.shouldThrow
|
||||
import io.kotest.core.spec.style.ShouldSpec
|
||||
import io.kotest.matchers.shouldBe
|
||||
import io.mockk.*
|
||||
|
||||
internal class BaseMemoryCacheTest : ShouldSpec({
|
||||
val cacheMap = mockk<MutableMap<Int, String>>()
|
||||
val cache = TestBaseMemoryCache(cacheMap)
|
||||
|
||||
val key = Int.MAX_VALUE
|
||||
val value = "unit test value"
|
||||
|
||||
fun setup_cacheMap_contains(exists: Boolean) {
|
||||
every { any() in cacheMap } returns exists
|
||||
}
|
||||
|
||||
fun setup_cacheMap_get(value: String?) {
|
||||
every { cacheMap[any()] } returns value
|
||||
}
|
||||
|
||||
afterEach {
|
||||
clearMocks(cacheMap)
|
||||
}
|
||||
|
||||
context("contains") {
|
||||
should("return false when key not in cache") {
|
||||
// Arrange
|
||||
setup_cacheMap_contains(false)
|
||||
|
||||
// Act
|
||||
val contains = key in cache
|
||||
|
||||
// Assert
|
||||
contains shouldBe false
|
||||
}
|
||||
|
||||
should("return true when key in cache") {
|
||||
// Arrange
|
||||
setup_cacheMap_contains(true)
|
||||
|
||||
// Act
|
||||
val contains = key in cache
|
||||
|
||||
// Assert
|
||||
contains shouldBe true
|
||||
}
|
||||
}
|
||||
|
||||
context("get") {
|
||||
should("return value corresponding to key") {
|
||||
// Arrange
|
||||
val expectedValue = "unit test value"
|
||||
|
||||
setup_cacheMap_get(expectedValue)
|
||||
|
||||
// Act
|
||||
val actualValue = cache[key]
|
||||
|
||||
// Assert
|
||||
actualValue shouldBe expectedValue
|
||||
}
|
||||
|
||||
should("return null when no value corresponding to key") {
|
||||
// Arrange
|
||||
setup_cacheMap_get(null)
|
||||
|
||||
// Act
|
||||
val actualValue = cache[key]
|
||||
|
||||
// Assert
|
||||
actualValue shouldBe null
|
||||
}
|
||||
}
|
||||
|
||||
context("getNotNull") {
|
||||
should("return value corresponding to key") {
|
||||
// Arrange
|
||||
setup_cacheMap_contains(true)
|
||||
setup_cacheMap_get(value)
|
||||
|
||||
// Act
|
||||
val actualValue = cache.getNotNull(key)
|
||||
|
||||
// Assert
|
||||
actualValue shouldBe value
|
||||
}
|
||||
|
||||
should("throw NullPointerException when no value corresponding to key") {
|
||||
// Arrange
|
||||
setup_cacheMap_contains(false)
|
||||
setup_cacheMap_get(null)
|
||||
|
||||
// Act
|
||||
// Assert
|
||||
shouldThrow<KeyNotFoundException> { cache.getNotNull(key) }
|
||||
}
|
||||
|
||||
should("throw NullPointerException with given key when no value corresponding to key") {
|
||||
// Arrange
|
||||
setup_cacheMap_contains(false)
|
||||
setup_cacheMap_get(null)
|
||||
|
||||
// Act
|
||||
val exception = shouldThrow<KeyNotFoundException> { cache.getNotNull(key) }
|
||||
|
||||
// Assert
|
||||
exception.key shouldBe key
|
||||
}
|
||||
}
|
||||
|
||||
context("set") {
|
||||
should("associates value to key in internal map") {
|
||||
// Arrange
|
||||
every { cacheMap[any()] = any() } just runs
|
||||
|
||||
// Act
|
||||
cache[key] = value
|
||||
|
||||
// Assert
|
||||
verify {
|
||||
cacheMap[key] = value
|
||||
}
|
||||
confirmVerified(cacheMap)
|
||||
}
|
||||
}
|
||||
|
||||
context("remove") {
|
||||
should("removes key-value pair from internal map") {
|
||||
// Arrange
|
||||
every { cacheMap.remove(any()) } returns value
|
||||
|
||||
// Act
|
||||
cache.remove(key)
|
||||
|
||||
// Assert
|
||||
verify {
|
||||
cacheMap.remove(key)
|
||||
}
|
||||
confirmVerified(cacheMap)
|
||||
}
|
||||
}
|
||||
|
||||
context("clear") {
|
||||
should("clears internal map") {
|
||||
// Arrange
|
||||
every { cacheMap.clear() } just runs
|
||||
|
||||
// Act
|
||||
cache.clear()
|
||||
|
||||
// Assert
|
||||
verify {
|
||||
cacheMap.clear()
|
||||
}
|
||||
confirmVerified(cacheMap)
|
||||
}
|
||||
}
|
||||
})
|
||||
|
||||
private class TestBaseMemoryCache<K, V>(map: MutableMap<K, V>) : BaseMemoryCache<K, V>(map)
|
||||
|
|
@ -0,0 +1,72 @@
|
|||
package dev.fyloz.memorycache
|
||||
|
||||
import io.kotest.core.spec.style.ShouldSpec
|
||||
import io.kotest.matchers.shouldBe
|
||||
|
||||
class BasicMemoryCacheTest : ShouldSpec({
|
||||
val cacheCapacity = 20
|
||||
val cache = BasicMemoryCache<Int, String>(cacheCapacity)
|
||||
|
||||
val key = Int.MAX_VALUE
|
||||
val value = "unit test value"
|
||||
|
||||
afterEach {
|
||||
cache.clear()
|
||||
}
|
||||
|
||||
context("set") {
|
||||
should("add key to internal key list") {
|
||||
// Arrange
|
||||
// Act
|
||||
cache[key] = value
|
||||
|
||||
// Assert
|
||||
val contains = key in cache
|
||||
contains shouldBe true
|
||||
}
|
||||
|
||||
should("remove oldest key-value pair when full") {
|
||||
// Arrange
|
||||
val firstKey = 0
|
||||
val lastKey = firstKey + cacheCapacity
|
||||
|
||||
for (currentKey in firstKey..lastKey) {
|
||||
cache[currentKey] = currentKey.toString()
|
||||
}
|
||||
|
||||
// Act
|
||||
val containsFirstKey = firstKey in cache
|
||||
|
||||
// Assert
|
||||
containsFirstKey shouldBe false
|
||||
}
|
||||
}
|
||||
|
||||
context("remove") {
|
||||
should("remove key from internal key list") {
|
||||
// Arrange
|
||||
cache[key] = value
|
||||
|
||||
// Act
|
||||
cache.remove(key)
|
||||
|
||||
// Assert
|
||||
val contains = key in cache
|
||||
contains shouldBe false
|
||||
}
|
||||
}
|
||||
|
||||
context("clear") {
|
||||
should("remove all keys from internal key list") {
|
||||
// Arrange
|
||||
cache[key] = value
|
||||
|
||||
// Act
|
||||
cache.clear()
|
||||
|
||||
// Assert
|
||||
val contains = key in cache
|
||||
contains shouldBe false
|
||||
}
|
||||
}
|
||||
})
|
||||
Loading…
Reference in New Issue