com.hortonworks.registries.schemaregistry.state.DefaultCustomSchemaStateExecutor.java Source code

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Here is the source code for com.hortonworks.registries.schemaregistry.state.DefaultCustomSchemaStateExecutor.java

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/*
 * Copyright 2016 Hortonworks.
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.hortonworks.registries.schemaregistry.state;

import com.hortonworks.registries.schemaregistry.errors.SchemaNotFoundException;
import org.apache.commons.lang3.tuple.Pair;

import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;

/**
 * This is default implementation of CustomSchemaStateExecutor which always leads to the success state.
 */
public class DefaultCustomSchemaStateExecutor implements CustomSchemaStateExecutor {
    private InReviewState inReviewState;

    private SchemaVersionLifecycleState successState;
    private SchemaVersionLifecycleState retryState;

    @Override
    public void init(SchemaVersionLifecycleStateMachine.Builder builder, Byte successStateId, Byte retryStateId,
            Map<String, ?> props) {
        this.successState = builder.getStates().get(successStateId);
        this.retryState = builder.getStates().get(retryStateId);
        inReviewState = new InReviewState(successState);
        builder.register(inReviewState);

        for (Pair<SchemaVersionLifecycleStateTransition, SchemaVersionLifecycleStateAction> pair : inReviewState
                .getTransitionActions()) {
            builder.transition(pair.getLeft(), pair.getRight());
        }
    }

    @Override
    public void executeReviewState(SchemaVersionLifecycleContext schemaVersionLifecycleContext)
            throws SchemaLifecycleException, SchemaNotFoundException {
        schemaVersionLifecycleContext.setState(inReviewState);
        schemaVersionLifecycleContext.updateSchemaVersionState();
    }

    private static final class InReviewState extends AbstractInbuiltSchemaLifecycleState {
        private final List<Pair<SchemaVersionLifecycleStateTransition, SchemaVersionLifecycleStateAction>> transitionActionPair;

        private InReviewState(final SchemaVersionLifecycleState targetState) {
            super("InReview", (byte) 32, "Finish the schema version.");
            SchemaVersionLifecycleStateTransition stateTransition = new SchemaVersionLifecycleStateTransition(
                    getId(), targetState.getId(), "FinishReview", "Finish schema review process");
            SchemaVersionLifecycleStateAction stateAction = context -> {
                context.setState(targetState);
                try {
                    context.updateSchemaVersionState();
                } catch (SchemaNotFoundException e) {
                    throw new SchemaLifecycleException(e);
                }
            };
            transitionActionPair = Collections.singletonList(Pair.of(stateTransition, stateAction));
        }

        @Override
        public Collection<Pair<SchemaVersionLifecycleStateTransition, SchemaVersionLifecycleStateAction>> getTransitionActions() {
            return transitionActionPair;
        }

        @Override
        public String toString() {
            return "FinishReviewState{" + super.toString() + "}";
        }

    }
}