com.twitter.aurora.scheduler.http.Quotas.java Source code

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Here is the source code for com.twitter.aurora.scheduler.http.Quotas.java

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/*
 * Copyright 2013 Twitter, 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.twitter.aurora.scheduler.http;

import java.util.Map;

import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;

import org.codehaus.jackson.annotate.JsonProperty;

import com.twitter.aurora.scheduler.storage.Storage;
import com.twitter.aurora.scheduler.storage.Storage.StoreProvider;
import com.twitter.aurora.scheduler.storage.Storage.Work;
import com.twitter.aurora.scheduler.storage.entities.IQuota;

/**
 * Servlet that exposes allocated resource quotas.
 */
@Path("/quotas")
public class Quotas {

    private final Storage storage;

    @Inject
    Quotas(Storage storage) {
        this.storage = Preconditions.checkNotNull(storage);
    }

    /**
     * Dumps allocated resource quotas.
     *
     * @return HTTP response.
     */
    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public Response getOffers(@QueryParam("role") final String role) {
        return storage.weaklyConsistentRead(new Work.Quiet<Response>() {
            @Override
            public Response apply(StoreProvider storeProvider) {
                Map<String, IQuota> quotas;
                if (role == null) {
                    quotas = storeProvider.getQuotaStore().fetchQuotas();
                } else {
                    Optional<IQuota> quota = storeProvider.getQuotaStore().fetchQuota(role);
                    if (quota.isPresent()) {
                        quotas = ImmutableMap.of(role, quota.get());
                    } else {
                        quotas = ImmutableMap.of();
                    }
                }

                return Response.ok(Maps.transformValues(quotas, TO_BEAN)).build();
            }
        });
    }

    private static final Function<IQuota, QuotaBean> TO_BEAN = new Function<IQuota, QuotaBean>() {
        @Override
        public QuotaBean apply(IQuota quota) {
            return new QuotaBean(quota.getNumCpus(), quota.getRamMb(), quota.getDiskMb());
        }
    };

    private static final class QuotaBean {
        private final double cpu;
        private final long ramMb;
        private final long diskMb;

        private QuotaBean(double cpu, long ramMb, long diskMb) {
            this.cpu = cpu;
            this.ramMb = ramMb;
            this.diskMb = diskMb;
        }

        @JsonProperty("cpu_cores")
        public double getCpu() {
            return cpu;
        }

        @JsonProperty("ram_mb")
        public long getRamMb() {
            return ramMb;
        }

        @JsonProperty("disk_mb")
        public long getDiskMb() {
            return diskMb;
        }
    }
}