org.arbeitspferde.groningen.subject.open.ProcessServingAddressGenerator.java Source code

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Here is the source code for org.arbeitspferde.groningen.subject.open.ProcessServingAddressGenerator.java

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/* Copyright 2013 Google, 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 org.arbeitspferde.groningen.subject.open;

import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;
import com.google.inject.Singleton;

import org.arbeitspferde.groningen.subject.ServingAddressGenerator;
import org.arbeitspferde.groningen.subject.SubjectGroup;
import org.arbeitspferde.groningen.utility.Process;

import java.util.List;

/**
 * Generates process unique address.
 */
@Singleton
public class ProcessServingAddressGenerator implements ServingAddressGenerator {
    private static final Joiner slashJoiner = Joiner.on("/");

    public static final class ProcessServingAddressInfo {
        private final String processClusterName;
        private final String processUserName;
        private final String processGroupName;
        private final Integer processId;

        public ProcessServingAddressInfo(String processClusterName, String processUserName, String processGroupName,
                int processId) {
            this.processClusterName = processClusterName;
            this.processUserName = processUserName;
            this.processGroupName = processGroupName;
            this.processId = processId;
        }

        public String getProcessUserName() {
            return processUserName;
        }

        public String getProcessGroupName() {
            return processGroupName;
        }

        public Integer getProcessId() {
            return processId;
        }
    }

    public static ProcessServingAddressInfo parseAddress(final String address) {
        int processId;
        String[] addressParts = Iterables.toArray(Splitter.on("/").split(address), String.class);
        try {
            processId = Integer.parseInt(addressParts[addressParts.length - 1]);
        } catch (NumberFormatException e) {
            return null;
        }
        return new ProcessServingAddressInfo(addressParts[0], addressParts[1], addressParts[2], processId);
    }

    /**
     * Returns process serving address that has the following format:
     * //CLUSTER_NAME/USER_NAME/GROUP_NAME/PID
     *
     * @param group the subject group of the process.
     * @param index the index of the process in the group.
     */
    @Override
    public String addressFor(final SubjectGroup group, final int index) {
        List<Integer> processIds = null;
        try {
            int processGroupId = Integer.parseInt(group.getName());
            processIds = Process.getProcessIdsOf(processGroupId);
        } catch (NumberFormatException e) {
            throw new RuntimeException("Named process groups are not supported yet.");
        }
        return slashJoiner.join("/", group.getClusterName(), group.getUserName(), group.getName(),
                processIds.get(index).toString());
    }
}