Java tutorial
/* * Copyright 2012-2017 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.boot.devtools.autoconfigure; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.boot.autoconfigure.condition.ConditionEvaluationReport; import org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportMessage; import org.springframework.boot.context.event.ApplicationReadyEvent; import org.springframework.context.ApplicationListener; /** * An {@link ApplicationListener} that logs the delta of condition evaluation across * restarts. * * @author Andy Wilkinson */ class ConditionEvaluationDeltaLoggingListener implements ApplicationListener<ApplicationReadyEvent> { private final Log logger = LogFactory.getLog(getClass()); private static ConditionEvaluationReport previousReport; @Override public void onApplicationEvent(ApplicationReadyEvent event) { ConditionEvaluationReport report = event.getApplicationContext().getBean(ConditionEvaluationReport.class); if (previousReport != null) { ConditionEvaluationReport delta = report.getDelta(previousReport); if (!delta.getConditionAndOutcomesBySource().isEmpty() || !delta.getExclusions().isEmpty() || !delta.getUnconditionalClasses().isEmpty()) { if (this.logger.isInfoEnabled()) { this.logger.info("Condition evaluation delta:" + new ConditionEvaluationReportMessage(delta, "CONDITION EVALUATION DELTA")); } } else { this.logger.info("Condition evaluation unchanged"); } } previousReport = report; } }