com.yahoo.druid.emitter.ComposingEmitterModule.java Source code

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Here is the source code for com.yahoo.druid.emitter.ComposingEmitterModule.java

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/*
 * Copyright (c) 2015 Yahoo Inc.
 *
 * 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 com.yahoo.druid.emitter;

import java.util.Collections;
import java.util.List;

import com.fasterxml.jackson.databind.Module;
import com.google.common.base.Function;
import com.google.common.collect.Lists;
import com.google.inject.Binder;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Provides;
import com.google.inject.name.Named;
import com.google.inject.name.Names;
import com.metamx.common.logger.Logger;
import com.metamx.emitter.core.Emitter;

import io.druid.guice.JsonConfigProvider;
import io.druid.guice.ManageLifecycle;
import io.druid.initialization.DruidModule;

public class ComposingEmitterModule implements DruidModule {
    private static Logger log = new Logger(ComposingEmitterModule.class);

    @Override
    public void configure(Binder binder) {
        JsonConfigProvider.bind(binder, "druid.emitter.composing", ComposingEmitterConfig.class);
    }

    @Override
    public List<? extends Module> getJacksonModules() {
        return Collections.EMPTY_LIST;
    }

    @Provides
    @ManageLifecycle
    @Named("composing")
    public Emitter getEmitter(ComposingEmitterConfig config, final Injector injector) {
        log.info("Creating Composing Emitter with %s", config.getEmitters());

        List<Emitter> emitters = Lists.transform(config.getEmitters(), new Function<String, Emitter>() {
            @Override
            public Emitter apply(String s) {
                return injector.getInstance(Key.get(Emitter.class, Names.named(s)));
            }
        });

        return new ComposingEmitter(emitters);
    }
}