org.simplify4u.slf4jmock.LoggerMock Maven / Gradle / Ivy

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/*
 * Copyright 2020 Slawomir Jaranowski
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.simplify4u.slf4jmock;

import org.slf4j.ILoggerFactory;
import org.slf4j.Logger;
import org.slf4j.spi.LoggerFactoryBinder;

import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;

import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.withSettings;

/**
 * SLF4J Logger mock service.
 */
public class LoggerMock implements LoggerFactoryBinder {

    private static final ILoggerFactory loggerFactory = LoggerMock::getLoggerProxyByName;

    private static final Map loggers = new HashMap<>();

    private static Logger createNewLoggerProxy(String name) {
        return (Logger) Proxy.newProxyInstance(LoggerMock.class.getClassLoader(),
                new Class[]{Logger.class, ProxyMock.class},
                new MockInvocationHandler(name, () ->
                        mock(SimpleLogger.class, withSettings().spiedInstance(new SimpleLogger(name)).stubOnly())
                )
        );
    }

    private static Logger getLoggerProxyByName(String name) {
        synchronized (loggers) {
            return loggers.computeIfAbsent(name, LoggerMock::createNewLoggerProxy);
        }
    }

    protected static ProxyMock getProxyByName(String name) {
        return (ProxyMock) getLoggerProxyByName(name);
    }

    protected static Collection getAllProxies() {
        return loggers.values().stream()
                .map(ProxyMock.class::cast)
                .collect(Collectors.toCollection(ArrayList::new));
    }

    @Override
    public ILoggerFactory getLoggerFactory() {
        return loggerFactory;
    }

    @Override
    public String getLoggerFactoryClassStr() {
        return LoggerMock.class.getName();
    }

    /**
     * Set Mock for given Logger at current thread.
     *
     * @param klass Logger class
     * @param mock  Mock to assign to Logger
     */
    public static void setMock(Class klass, Logger mock) {
        setMock(klass.getName(), mock);
    }

    /**
     * Set Mock for given Logger at current thread.
     *
     * @param name Logger name
     * @param mock Mock to assign to Logger
     */

    public static void setMock(String name, Logger mock) {
        getProxyByName(name).setMock(mock);
    }

    /**
     * Clear Mock for Logger at current thread.
     *
     * @param klass Logger class
     */
    public static void clearMock(Class klass) {
        clearMock(klass.getName());
    }

    /**
     * Clear Mock for Logger at current thread.
     *
     * @param name Logger name
     */
    public static void clearMock(String name) {
        getProxyByName(name).clearMock();
    }
}