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Added Rx example code for Java blog entry
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group 'org.web3j.examples' | ||
version '1.0-SNAPSHOT' | ||
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apply plugin: 'java' | ||
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sourceCompatibility = 1.8 | ||
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repositories { | ||
mavenCentral() | ||
} | ||
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dependencies { | ||
compile 'org.web3j:core:1.1.2' | ||
testCompile 'junit:junit:4.11' | ||
} |
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#Thu Feb 09 09:12:53 AEDT 2017 | ||
distributionBase=GRADLE_USER_HOME | ||
distributionPath=wrapper/dists | ||
zipStoreBase=GRADLE_USER_HOME | ||
zipStorePath=wrapper/dists | ||
distributionUrl=https\://services.gradle.org/distributions/gradle-3.1-all.zip |
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#!/usr/bin/env bash | ||
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############################################################################## | ||
## | ||
## Gradle start up script for UN*X | ||
## | ||
############################################################################## | ||
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# 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 | ||
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APP_NAME="Gradle" | ||
APP_BASE_NAME=`basename "$0"` | ||
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# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. | ||
DEFAULT_JVM_OPTS="" | ||
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# Use the maximum available, or set MAX_FD != -1 to use that value. | ||
MAX_FD="maximum" | ||
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warn ( ) { | ||
echo "$*" | ||
} | ||
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die ( ) { | ||
echo | ||
echo "$*" | ||
echo | ||
exit 1 | ||
} | ||
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# OS specific support (must be 'true' or 'false'). | ||
cygwin=false | ||
msys=false | ||
darwin=false | ||
nonstop=false | ||
case "`uname`" in | ||
CYGWIN* ) | ||
cygwin=true | ||
;; | ||
Darwin* ) | ||
darwin=true | ||
;; | ||
MINGW* ) | ||
msys=true | ||
;; | ||
NONSTOP* ) | ||
nonstop=true | ||
;; | ||
esac | ||
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CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar | ||
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# Determine the Java command to use to start the JVM. | ||
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: $JAVA_HOME | ||
Please set the JAVA_HOME variable in your environment to match the | ||
location of your Java installation." | ||
fi | ||
else | ||
JAVACMD="java" | ||
which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. | ||
Please set the JAVA_HOME variable in your environment to match the | ||
location of your Java installation." | ||
fi | ||
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# Increase the maximum file descriptors if we can. | ||
if [ "$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 | ||
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# 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 | ||
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# 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"` | ||
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# 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 | ||
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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 | ||
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# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules | ||
function splitJvmOpts() { | ||
JVM_OPTS=("$@") | ||
} | ||
eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS | ||
JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME" | ||
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# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong | ||
if [[ "$(uname)" == "Darwin" ]] && [[ "$HOME" == "$PWD" ]]; then | ||
cd "$(dirname "$0")" | ||
fi | ||
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exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@" |
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@if "%DEBUG%" == "" @echo off | ||
@rem ########################################################################## | ||
@rem | ||
@rem Gradle startup script for Windows | ||
@rem | ||
@rem ########################################################################## | ||
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@rem Set local scope for the variables with windows NT shell | ||
if "%OS%"=="Windows_NT" setlocal | ||
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set DIRNAME=%~dp0 | ||
if "%DIRNAME%" == "" set DIRNAME=. | ||
set APP_BASE_NAME=%~n0 | ||
set APP_HOME=%DIRNAME% | ||
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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. | ||
set DEFAULT_JVM_OPTS= | ||
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@rem Find java.exe | ||
if defined JAVA_HOME goto findJavaFromJavaHome | ||
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set JAVA_EXE=java.exe | ||
%JAVA_EXE% -version >NUL 2>&1 | ||
if "%ERRORLEVEL%" == "0" goto init | ||
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echo. | ||
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. | ||
echo. | ||
echo Please set the JAVA_HOME variable in your environment to match the | ||
echo location of your Java installation. | ||
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goto fail | ||
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:findJavaFromJavaHome | ||
set JAVA_HOME=%JAVA_HOME:"=% | ||
set JAVA_EXE=%JAVA_HOME%/bin/java.exe | ||
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if exist "%JAVA_EXE%" goto init | ||
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echo. | ||
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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goto fail | ||
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:init | ||
@rem Get command-line arguments, handling Windows variants | ||
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if not "%OS%" == "Windows_NT" goto win9xME_args | ||
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:win9xME_args | ||
@rem Slurp the command line arguments. | ||
set CMD_LINE_ARGS= | ||
set _SKIP=2 | ||
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:win9xME_args_slurp | ||
if "x%~1" == "x" goto execute | ||
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set CMD_LINE_ARGS=%* | ||
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:execute | ||
@rem Setup the command line | ||
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set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar | ||
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@rem Execute Gradle | ||
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% | ||
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:end | ||
@rem End local scope for the variables with windows NT shell | ||
if "%ERRORLEVEL%"=="0" goto mainEnd | ||
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:fail | ||
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of | ||
rem the _cmd.exe /c_ return code! | ||
if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 | ||
exit /b 1 | ||
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:mainEnd | ||
if "%OS%"=="Windows_NT" endlocal | ||
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:omega |
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rootProject.name = 'rx' | ||
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package org.web3j.examples.rx; | ||
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import java.math.BigDecimal; | ||
import java.math.BigInteger; | ||
import java.time.Instant; | ||
import java.time.LocalDateTime; | ||
import java.time.ZoneId; | ||
import java.util.concurrent.CountDownLatch; | ||
import java.util.concurrent.TimeUnit; | ||
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import rx.Observable; | ||
import rx.Subscription; | ||
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import org.web3j.protocol.Web3j; | ||
import org.web3j.protocol.core.methods.response.EthBlock; | ||
import org.web3j.protocol.core.methods.response.Transaction; | ||
import org.web3j.protocol.http.HttpService; | ||
import org.web3j.utils.Convert; | ||
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/** | ||
* Demonstrations of working with RxJava's Observables in web3j. | ||
*/ | ||
public class Main { | ||
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private static final int COUNT = 10; | ||
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private final Web3j web3j; | ||
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public Main() { | ||
web3j = Web3j.build(new HttpService()); // defaults to http://localhost:8545/ | ||
} | ||
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private void run() throws Exception { | ||
simpleFilterExample(); | ||
blockInfoExample(); | ||
countingEtherExample(); | ||
clientVersionExample(); | ||
} | ||
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public static void main(String[] args) throws Exception { | ||
new Main().run(); | ||
} | ||
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private void simpleFilterExample() throws Exception { | ||
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Subscription subscription = web3j.blockObservable(false).subscribe(block -> { | ||
System.out.println("Sweet, block number " + block.getBlock().get().getNumber() + " has just been created"); | ||
}, Throwable::printStackTrace); | ||
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TimeUnit.MINUTES.sleep(2); | ||
subscription.unsubscribe(); | ||
} | ||
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private void blockInfoExample() throws Exception { | ||
CountDownLatch countDownLatch = new CountDownLatch(1); | ||
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System.out.println("Waiting for " + COUNT + " transactions..."); | ||
Subscription subscription = web3j.blockObservable(true) | ||
.take(COUNT) | ||
.subscribe(ethBlock -> { | ||
EthBlock.Block block = ethBlock.getBlock().get(); | ||
LocalDateTime timestamp = Instant.ofEpochSecond( | ||
block.getTimestamp().longValueExact()).atZone(ZoneId.of("UTC")).toLocalDateTime(); | ||
int transactionCount = block.getTransactions().size(); | ||
String hash = block.getHash(); | ||
String parentHash = block.getParentHash(); | ||
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System.out.println( | ||
timestamp + " " + | ||
"Tx count: " + transactionCount + ", " + | ||
"Hash: " + hash + ", " + | ||
"Parent hash: " + parentHash | ||
); | ||
countDownLatch.countDown(); | ||
}, Throwable::printStackTrace); | ||
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countDownLatch.await(10, TimeUnit.MINUTES); | ||
subscription.unsubscribe(); | ||
} | ||
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private void countingEtherExample() throws Exception { | ||
CountDownLatch countDownLatch = new CountDownLatch(1); | ||
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System.out.println("Waiting for " + COUNT + " transactions..."); | ||
Observable<BigInteger> transactionValue = web3j.transactionObservable() | ||
.take(COUNT) | ||
.map(Transaction::getValue) | ||
.reduce(BigInteger.ZERO, BigInteger::add); | ||
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Subscription subscription = transactionValue.subscribe(total -> { | ||
System.out.println("Transaction value: " + | ||
Convert.fromWei(new BigDecimal(total), Convert.Unit.ETHER) + " Ether"); | ||
countDownLatch.countDown(); | ||
}, Throwable::printStackTrace); | ||
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countDownLatch.await(10, TimeUnit.MINUTES); | ||
subscription.unsubscribe(); | ||
} | ||
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private void clientVersionExample() throws Exception { | ||
CountDownLatch countDownLatch = new CountDownLatch(1); | ||
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Subscription subscription = web3j.web3ClientVersion().observable().subscribe(x -> { | ||
System.out.println(x.getWeb3ClientVersion()); | ||
countDownLatch.countDown(); | ||
}); | ||
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countDownLatch.await(); | ||
subscription.unsubscribe(); | ||
} | ||
} |