# YammerHealthCheck.java

    /*
     * Copyright (c) 2012, Niclas Hedhman. All Rights Reserved.
     *
     * 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.qi4j.metrics.yammer;

    import com.yammer.metrics.HealthChecks;
    import com.yammer.metrics.core.HealthCheck;
    import org.qi4j.api.metrics.MetricsHealthCheck;

    public class YammerHealthCheck
        implements MetricsHealthCheck
    {
        private MetricsHealthCheck check;

        public YammerHealthCheck( Class<?> origin, String name, final MetricsHealthCheck check )
        {
            this.check = check;
            HealthChecks.register( new HealthCheck( name )
            {
                @Override
                protected Result check()
                    throws Exception
                {
                    MetricsHealthCheck.Result result = check.check();
                    String message = result.getMessage();
                    if( result.isHealthy() )
                    {
                        if( message != null )
                        {
                            return Result.healthy( message );
                        }
                        return Result.healthy();
                    }
                    Throwable exception = result.getException();
                    if( exception != null )
                    {
                        return Result.unhealthy( exception );
                    }
                    return Result.unhealthy( message );
                }
            } );
        }

        @Override
        public Result check()
            throws Exception
        {
            return check.check();
        }
    }