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AssertableLogProvider.java
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AssertableLogProvider.java
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/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.logging;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.StringDescription;
import org.junit.rules.TestRule;
import org.junit.runners.model.Statement;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.IllegalFormatException;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.function.Consumer;
import java.util.function.Function;
import javax.annotation.Nonnull;
import static java.lang.String.format;
import static java.util.Arrays.asList;
import static org.apache.commons.lang3.StringEscapeUtils.escapeJava;
import static org.hamcrest.CoreMatchers.anyOf;
import static org.hamcrest.Matchers.any;
import static org.hamcrest.Matchers.arrayContaining;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.nullValue;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
public class AssertableLogProvider extends AbstractLogProvider<Log> implements TestRule
{
private final boolean debugEnabled;
private final List<LogCall> logCalls = new CopyOnWriteArrayList<>();
public AssertableLogProvider()
{
this( false );
}
public AssertableLogProvider( boolean debugEnabled )
{
this.debugEnabled = debugEnabled;
}
@Override
public Statement apply( final Statement base, org.junit.runner.Description description )
{
return new Statement()
{
@Override
public void evaluate() throws Throwable
{
try
{
base.evaluate();
}
catch ( Throwable failure )
{
print( System.out );
throw failure;
}
}
};
}
public void print( PrintStream out )
{
for ( LogCall call : logCalls )
{
out.println( call.toLogLikeString() );
if ( call.throwable != null )
{
call.throwable.printStackTrace( out );
}
}
}
public enum Level
{
DEBUG,
INFO,
WARN,
ERROR
}
private static final class LogCall
{
private final String context;
private final Level level;
private final String message;
private final Object[] arguments;
private final Throwable throwable;
private LogCall( String context, Level level, String message, Object[] arguments, Throwable throwable )
{
this.level = level;
this.context = context;
this.message = message;
this.arguments = arguments;
this.throwable = throwable;
}
@Override
public String toString()
{
StringBuilder builder = new StringBuilder( "LogCall{" );
builder.append( context );
builder.append( " " );
builder.append( level );
builder.append( ", message=" );
if ( message != null )
{
builder.append( '\'' ).append( escapeJava( message ) ).append( '\'' );
}
else
{
builder.append( "null" );
}
builder.append( ", arguments=" );
if ( arguments != null )
{
builder.append( "[" );
boolean first = true;
for ( Object arg : arguments )
{
if ( !first )
{
builder.append( ',' );
}
first = false;
builder.append( escapeJava( "" + arg ) );
}
builder.append( "]" );
}
else
{
builder.append( "null" );
}
builder.append( ", throwable=" );
if ( throwable != null )
{
builder.append( '\'' ).append( escapeJava( throwable.toString() ) ).append( '\'' );
}
else
{
builder.append( "null" );
}
builder.append( "}" );
return builder.toString();
}
public String toLogLikeString()
{
String msg;
if ( arguments != null )
{
try
{
msg = format( message, arguments );
}
catch ( IllegalFormatException e )
{
msg = format( "IllegalFormat{message: \"%s\", arguments: %s}",
message, Arrays.toString( arguments ) );
}
}
else
{
msg = message;
}
return format( "%s @ %s: %s", level, context, msg );
}
}
private class LogCallRecorder implements Logger
{
private final String context;
private final Level level;
LogCallRecorder( String context, Level level )
{
this.context = context;
this.level = level;
}
@Override
public void log( @Nonnull String message )
{
logCalls.add( new LogCall( context, level, message, null, null ) );
}
@Override
public void log( @Nonnull String message, @Nonnull Throwable throwable )
{
logCalls.add( new LogCall( context, level, message, null, throwable ) );
}
@Override
public void log( @Nonnull String format, @Nonnull Object... arguments )
{
logCalls.add( new LogCall( context, level, format, arguments, null ) );
}
@Override
public void bulk( @Nonnull Consumer<Logger> consumer )
{
consumer.accept( this );
}
}
private class AssertableLog extends AbstractLog
{
private final Logger debugLogger;
private final Logger infoLogger;
private final Logger warnLogger;
private final Logger errorLogger;
AssertableLog( String context )
{
this.debugLogger = new LogCallRecorder( context, Level.DEBUG );
this.infoLogger = new LogCallRecorder( context, Level.INFO );
this.warnLogger = new LogCallRecorder( context, Level.WARN );
this.errorLogger = new LogCallRecorder( context, Level.ERROR );
}
@Override
public boolean isDebugEnabled()
{
return debugEnabled;
}
@Nonnull
@Override
public Logger debugLogger()
{
return debugLogger;
}
@Nonnull
@Override
public Logger infoLogger()
{
return infoLogger;
}
@Nonnull
@Override
public Logger warnLogger()
{
return warnLogger;
}
@Nonnull
@Override
public Logger errorLogger()
{
return errorLogger;
}
@Override
public void bulk( @Nonnull Consumer<Log> consumer )
{
consumer.accept( this );
}
}
@Override
protected Log buildLog( Class loggingClass )
{
return new AssertableLog( loggingClass.getName() );
}
@Override
protected Log buildLog( String context )
{
return new AssertableLog( context );
}
//
// TEST TOOLS
//
private static final Matcher<Class> ANY_CLASS_MATCHER = any( Class.class );
private static final Matcher<Level> DEBUG_LEVEL_MATCHER = equalTo( Level.DEBUG );
private static final Matcher<Level> INFO_LEVEL_MATCHER = equalTo( Level.INFO );
private static final Matcher<Level> WARN_LEVEL_MATCHER = equalTo( Level.WARN );
private static final Matcher<Level> ERROR_LEVEL_MATCHER = equalTo( Level.ERROR );
private static final Matcher<Level> ANY_LEVEL_MATCHER = any( Level.class );
private static final Matcher<String> ANY_MESSAGE_MATCHER = any( String.class );
private static final Matcher<Object[]> NULL_ARGUMENTS_MATCHER = nullValue( Object[].class );
private static final Matcher<Object[]> ANY_ARGUMENTS_MATCHER = any( Object[].class );
private static final Matcher<Throwable> NULL_THROWABLE_MATCHER = nullValue( Throwable.class );
private static final Matcher<Throwable> ANY_THROWABLE_MATCHER = any( Throwable.class );
public static final class LogMatcher
{
private final Matcher<String> contextMatcher;
private final Matcher<Level> levelMatcher;
private final Matcher<String> messageMatcher;
private final Matcher<? extends Object[]> argumentsMatcher;
private final Matcher<? extends Throwable> throwableMatcher;
public LogMatcher( Matcher<String> contextMatcher, Matcher<Level> levelMatcher, Matcher<String> messageMatcher, Matcher<? extends Object[]> argumentsMatcher, Matcher<? extends Throwable> throwableMatcher )
{
this.contextMatcher = contextMatcher;
this.levelMatcher = levelMatcher;
this.messageMatcher = messageMatcher;
this.argumentsMatcher = argumentsMatcher;
this.throwableMatcher = throwableMatcher;
}
protected boolean matches( LogCall logCall )
{
return logCall != null &&
contextMatcher.matches( logCall.context ) &&
levelMatcher.matches( logCall.level ) &&
messageMatcher.matches( logCall.message ) &&
argumentsMatcher.matches( logCall.arguments ) &&
throwableMatcher.matches( logCall.throwable );
}
@Override
public String toString()
{
Description description = new StringDescription();
description.appendText( "LogMatcher{" );
description.appendDescriptionOf( contextMatcher );
description.appendText( ", " );
description.appendDescriptionOf( levelMatcher );
description.appendText( ", message=" );
description.appendDescriptionOf( messageMatcher );
description.appendText( ", arguments=" );
description.appendDescriptionOf( argumentsMatcher );
description.appendText( ", throwable=" );
description.appendDescriptionOf( throwableMatcher );
description.appendText( "}" );
return description.toString();
}
}
public static final class LogMatcherBuilder
{
private final Matcher<String> contextMatcher;
private LogMatcherBuilder( Matcher<String> contextMatcher )
{
this.contextMatcher = contextMatcher;
}
public LogMatcher debug( String message )
{
return new LogMatcher( contextMatcher, DEBUG_LEVEL_MATCHER, equalTo( message ), NULL_ARGUMENTS_MATCHER, NULL_THROWABLE_MATCHER );
}
public LogMatcher debug( Matcher<String> messageMatcher )
{
return new LogMatcher( contextMatcher, DEBUG_LEVEL_MATCHER, messageMatcher, NULL_ARGUMENTS_MATCHER, NULL_THROWABLE_MATCHER );
}
public LogMatcher debug( Matcher<String> messageMatcher, Matcher<Throwable> throwableMatcher )
{
return new LogMatcher( contextMatcher, DEBUG_LEVEL_MATCHER, messageMatcher, NULL_ARGUMENTS_MATCHER, throwableMatcher );
}
public LogMatcher debug( String format, Object... arguments )
{
return debug( equalTo( format ), arguments );
}
public LogMatcher debug( Matcher<String> format, Object... arguments )
{
return new LogMatcher( contextMatcher, DEBUG_LEVEL_MATCHER, format, arrayContaining( ensureMatchers( arguments ) ), NULL_THROWABLE_MATCHER );
}
public LogMatcher info( String message )
{
return new LogMatcher( contextMatcher, INFO_LEVEL_MATCHER, equalTo( message ), NULL_ARGUMENTS_MATCHER, NULL_THROWABLE_MATCHER );
}
public LogMatcher info( Matcher<String> messageMatcher )
{
return new LogMatcher( contextMatcher, INFO_LEVEL_MATCHER, messageMatcher, NULL_ARGUMENTS_MATCHER, NULL_THROWABLE_MATCHER );
}
public LogMatcher info( Matcher<String> messageMatcher, Matcher<Throwable> throwableMatcher )
{
return new LogMatcher( contextMatcher, INFO_LEVEL_MATCHER, messageMatcher, NULL_ARGUMENTS_MATCHER, throwableMatcher );
}
public LogMatcher info( String format, Object... arguments )
{
return info( equalTo( format ), arguments );
}
public LogMatcher info( Matcher<String> format, Object... arguments )
{
return new LogMatcher( contextMatcher, INFO_LEVEL_MATCHER, format, arrayContaining( ensureMatchers( arguments ) ), NULL_THROWABLE_MATCHER );
}
public LogMatcher warn( String message )
{
return new LogMatcher( contextMatcher, WARN_LEVEL_MATCHER, equalTo( message ), NULL_ARGUMENTS_MATCHER, NULL_THROWABLE_MATCHER );
}
public LogMatcher warn( Matcher<String> messageMatcher )
{
return new LogMatcher( contextMatcher, WARN_LEVEL_MATCHER, messageMatcher, NULL_ARGUMENTS_MATCHER, NULL_THROWABLE_MATCHER );
}
public LogMatcher warn( Matcher<String> messageMatcher, Matcher<Throwable> throwableMatcher )
{
return new LogMatcher( contextMatcher, WARN_LEVEL_MATCHER, messageMatcher, NULL_ARGUMENTS_MATCHER, throwableMatcher );
}
public LogMatcher warn( String format, Object... arguments )
{
return warn( equalTo( format ), arguments );
}
public LogMatcher warn( Matcher<String> format, Object... arguments )
{
return new LogMatcher( contextMatcher, WARN_LEVEL_MATCHER, format, arrayContaining( ensureMatchers( arguments ) ), NULL_THROWABLE_MATCHER );
}
public LogMatcher error( String message )
{
return new LogMatcher( contextMatcher, ERROR_LEVEL_MATCHER, equalTo( message ), NULL_ARGUMENTS_MATCHER, NULL_THROWABLE_MATCHER );
}
public LogMatcher error( Matcher<String> messageMatcher )
{
return new LogMatcher( contextMatcher, ERROR_LEVEL_MATCHER, messageMatcher, NULL_ARGUMENTS_MATCHER, NULL_THROWABLE_MATCHER );
}
public LogMatcher error( Matcher<String> messageMatcher, Matcher<? extends Throwable> throwableMatcher )
{
return new LogMatcher( contextMatcher, ERROR_LEVEL_MATCHER, messageMatcher, NULL_ARGUMENTS_MATCHER, throwableMatcher );
}
public LogMatcher error( String format, Object... arguments )
{
return error( equalTo( format ), arguments );
}
public LogMatcher error( Matcher<String> format, Object... arguments )
{
return new LogMatcher( contextMatcher, ERROR_LEVEL_MATCHER, format, arrayContaining( ensureMatchers( arguments ) ), NULL_THROWABLE_MATCHER );
}
public LogMatcher any()
{
return new LogMatcher(
contextMatcher, ANY_LEVEL_MATCHER, ANY_MESSAGE_MATCHER,
anyOf( NULL_ARGUMENTS_MATCHER, ANY_ARGUMENTS_MATCHER ),
anyOf( NULL_THROWABLE_MATCHER, ANY_THROWABLE_MATCHER ) );
}
@SuppressWarnings( "unchecked" )
private Matcher<Object>[] ensureMatchers( Object... arguments )
{
List<Matcher> matchers = new ArrayList<>();
for ( Object arg : arguments )
{
if ( arg instanceof Matcher )
{
matchers.add( (Matcher) arg );
}
else
{
matchers.add( equalTo( arg ) );
}
}
return matchers.toArray( new Matcher[arguments.length] );
}
}
public static LogMatcherBuilder inLog( Class logClass )
{
return inLog( equalTo( logClass.getName() ) );
}
public static LogMatcherBuilder inLog( String context )
{
return inLog( equalTo( context ) );
}
public static LogMatcherBuilder inLog( Matcher<String> contextMatcher )
{
return new LogMatcherBuilder( contextMatcher );
}
public void assertExactly( LogMatcher... expected )
{
Iterator<LogMatcher> expectedIterator = asList( expected ).iterator();
synchronized (logCalls)
{
Iterator<LogCall> callsIterator = logCalls.iterator();
while ( expectedIterator.hasNext() )
{
if ( callsIterator.hasNext() )
{
LogMatcher logMatcher = expectedIterator.next();
LogCall logCall = callsIterator.next();
if ( !logMatcher.matches( logCall ) )
{
fail( format( "Log call did not match expectation\n Expected: %s\n Call was: %s", logMatcher, logCall ) );
}
}
else
{
fail( format( "Got fewer log calls than expected. The missing log calls were:\n%s", describe( expectedIterator ) ) );
}
}
if ( callsIterator.hasNext() )
{
fail( format( "Got more log calls than expected. The remaining log calls were:\n%s", serialize( callsIterator ) ) );
}
}
}
@SafeVarargs
public final void assertContainsLogCallsMatching( int logSkipCount, Matcher<String>... matchers )
{
synchronized ( logCalls )
{
assertEquals( logCalls.size(), logSkipCount + matchers.length );
for ( int i = 0; i < matchers.length; i++ )
{
LogCall logCall = logCalls.get( logSkipCount + i );
Matcher<String> matcher = matchers[i];
if ( !matcher.matches( logCall.message ) )
{
StringDescription description = new StringDescription();
description.appendDescriptionOf( matcher );
fail( format( "Expected log statement with message as %s, but none found. Actual log call was:\n%s",
description.toString(), logCall.toString() ) );
}
}
}
}
public void assertContainsThrowablesMatching( int logSkipCount, Throwable... throwables )
{
synchronized ( logCalls )
{
assertEquals( logCalls.size(), logSkipCount + throwables.length );
for ( int i = 0; i < throwables.length; i++ )
{
LogCall logCall = logCalls.get( logSkipCount + i );
Throwable throwable = throwables[i];
if ( logCall.throwable == null && throwable != null ||
logCall.throwable != null && logCall.throwable.getClass() != throwable.getClass() )
{
fail( format( "Expected %s, but was:\n%s",
throwable, logCall.throwable ) );
}
}
}
}
/**
* Note: Does not care about ordering.
*/
public void assertAtLeastOnce( LogMatcher... expected )
{
Set<LogMatcher> expectedMatchers = new HashSet<>( Arrays.asList( expected ) );
synchronized (logCalls)
{
for ( LogCall logCall : logCalls )
{
for ( LogMatcher matcher : expectedMatchers )
{
if ( matcher.matches( logCall ) )
{
expectedMatchers.remove( matcher );
break;
}
}
}
if ( expectedMatchers.size() > 0 )
{
fail( format(
"These log calls were expected, but never occurred:\n%s\nActual log calls were:\n%s",
describe( expectedMatchers.iterator() ),
serialize( logCalls.iterator() )
) );
}
}
}
public void assertNone( LogMatcher notExpected )
{
synchronized (logCalls)
{
for ( LogCall logCall : logCalls )
{
if ( notExpected.matches( logCall ) )
{
fail( format(
"Log call was not expected, but occurred:\n%s\n", logCall.toString()
) );
}
}
}
}
public void assertNoLogCallContaining( String partOfMessage )
{
if ( containsLogCallContaining( partOfMessage ) )
{
fail( format(
"Expected no log statement containing '%s', but at least one found. Actual log calls were:\n%s",
partOfMessage, serialize( logCalls.iterator() ) ) );
}
}
public void assertContainsLogCallContaining( String partOfMessage )
{
if ( !containsLogCallContaining( partOfMessage ) )
{
fail( format(
"Expected at least one log statement containing '%s', but none found. Actual log calls were:\n%s",
partOfMessage, serialize( logCalls.iterator() ) ) );
}
}
boolean containsLogCallContaining( String partOfMessage )
{
synchronized (logCalls)
{
for ( LogCall logCall : logCalls )
{
if ( logCall.toString().contains( partOfMessage ) )
{
return true;
}
}
}
return false;
}
public void assertContainsMessageContaining( String partOfMessage )
{
synchronized (logCalls)
{
if ( containsMessage( partOfMessage ) )
{
return;
}
fail( format( "Expected at least one log statement containing '%s', but none found. Actual log calls were:\n%s",
partOfMessage, serialize( logCalls.iterator() ) ) );
}
}
private boolean containsMessage( String partOfMessage )
{
for ( LogCall logCall : logCalls )
{
if ( logCall.message.contains( partOfMessage ) )
{
return true;
}
}
return false;
}
public void assertNoMessagesContaining( String partOfMessage )
{
synchronized ( logCalls )
{
if ( containsMessage( partOfMessage ) )
{
fail( format(
"Expected at least one log statement containing '%s', but none found. Actual log calls were:\n%s",
partOfMessage, serialize( logCalls.iterator() ) ) );
}
}
}
public void assertContainsMessageMatching( Matcher<String> messageMatcher )
{
synchronized (logCalls)
{
for ( LogCall logCall : logCalls )
{
if ( messageMatcher.matches( logCall.message ) )
{
return;
}
}
StringDescription description = new StringDescription();
description.appendDescriptionOf( messageMatcher );
fail( format(
"Expected at least one log statement with message as %s, but none found. Actual log calls were:\n%s", description.toString(), serialize( logCalls.iterator() )
) );
}
}
public void assertNoLoggingOccurred()
{
if ( logCalls.size() != 0 )
{
fail( format( "Expected no log messages at all, but got:\n%s", serialize( logCalls.iterator() ) ) );
}
}
/**
* Clear this logger for re-use.
*/
public void clear()
{
logCalls.clear();
}
public String serialize()
{
return serialize( logCalls.iterator(), LogCall::toLogLikeString );
}
private String describe( Iterator<LogMatcher> matchers )
{
StringBuilder sb = new StringBuilder();
while ( matchers.hasNext() )
{
sb.append( matchers.next().toString() );
sb.append( "\n" );
}
return sb.toString();
}
private String serialize( Iterator<LogCall> events )
{
return serialize( events, LogCall::toString );
}
private String serialize( Iterator<LogCall> events, Function<LogCall,String> serializer )
{
StringBuilder sb = new StringBuilder();
while ( events.hasNext() )
{
sb.append( serializer.apply( events.next() ) );
sb.append( "\n" );
}
return sb.toString();
}
}