co.cask.cdap.data2.transaction.stream.StreamConsumerState.java Source code

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Here is the source code for co.cask.cdap.data2.transaction.stream.StreamConsumerState.java

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/*
 * Copyright  2014 Cask Data, 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 co.cask.cdap.data2.transaction.stream;

import co.cask.cdap.data.stream.StreamFileOffset;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;

/**
 * Represents the consumer state of a {@link StreamConsumer}.
 */
public final class StreamConsumerState implements ConsumerState<Iterable<StreamFileOffset>> {

    private final long groupId;
    private final int instanceId;
    private Iterable<StreamFileOffset> state;

    public StreamConsumerState(StreamConsumerState other) {
        this(other.getGroupId(), other.getInstanceId(), other.getState());
    }

    public StreamConsumerState(long groupId, int instanceId) {
        this(groupId, instanceId, ImmutableList.<StreamFileOffset>of());
    }

    public StreamConsumerState(long groupId, int instanceId, Iterable<StreamFileOffset> state) {
        this.groupId = groupId;
        this.instanceId = instanceId;
        this.state = ImmutableList.copyOf(state);
    }

    @Override
    public long getGroupId() {
        return groupId;
    }

    @Override
    public int getInstanceId() {
        return instanceId;
    }

    @Override
    public Iterable<StreamFileOffset> getState() {
        return state;
    }

    @Override
    public void setState(Iterable<StreamFileOffset> state) {
        this.state = ImmutableList.copyOf(state);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        StreamConsumerState other = (StreamConsumerState) o;

        return (groupId == other.groupId) && (instanceId == other.instanceId)
                && Iterables.elementsEqual(state, other.state);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(groupId, instanceId, state);
    }

    @Override
    public String toString() {
        return Objects.toStringHelper(this).add("groupId", groupId).add("instanceId", instanceId)
                .add("states", state).toString();
    }
}