org.springframework.test.web.reactive.server.LoggingExchangeConsumer.java Source code

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Here is the source code for org.springframework.test.web.reactive.server.LoggingExchangeConsumer.java

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/*
 * Copyright 2002-2017 the original author or authors.
 *
 * 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.springframework.test.web.reactive.server;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.function.BiConsumer;
import java.util.function.Predicate;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Provides options for logging information about the performed exchange.
 *
 * @author Rossen Stoyanchev
 * @since 5.0
 */
public class LoggingExchangeConsumer {

    private static Log logger = LogFactory.getLog(LoggingExchangeConsumer.class);

    private final ExchangeActions exchangeActions;

    private final ExchangeInfo exchangeInfo;

    public LoggingExchangeConsumer(ExchangeActions exchangeActions, ExchangeInfo exchangeInfo) {
        this.exchangeActions = exchangeActions;
        this.exchangeInfo = exchangeInfo;
    }

    /**
     * Log with {@link System#out}.
     */
    public ExchangeActions toConsole() {
        System.out.println(this.exchangeInfo.toString());
        return this.exchangeActions;
    }

    /**
     * Log with a given {@link OutputStream}.
     */
    public ExchangeActions toOutputStream(OutputStream stream) {
        return toWriter(new PrintWriter(stream, true));
    }

    /**
     * Log with a given {@link Writer}.
     */
    public ExchangeActions toWriter(Writer writer) {
        try {
            writer.write(this.exchangeInfo.toString());
        } catch (IOException ex) {
            throw new IllegalStateException("Failed to print exchange info", ex);
        }
        return this.exchangeActions;
    }

    /**
     * Log if TRACE level logging is enabled.
     */
    public ExchangeActions ifTraceEnabled() {
        return doLog(Log::isTraceEnabled, Log::trace);
    }

    /**
     * Log if DEBUG level logging is enabled.
     */
    public ExchangeActions ifDebugEnabled() {
        return doLog(Log::isDebugEnabled, Log::debug);
    }

    /**
     * Log if INFO level logging is enabled.
     */
    public ExchangeActions ifInfoEnabled() {
        return doLog(Log::isInfoEnabled, Log::info);
    }

    private ExchangeActions doLog(Predicate<Log> logLevelPredicate, BiConsumer<Log, String> logAction) {
        if (logLevelPredicate.test(logger)) {
            logAction.accept(logger, this.exchangeInfo.toString());
        }
        return this.exchangeActions;
    }

}