/*
* Copyright © 2016 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.etl.proto.v2;
import co.cask.cdap.api.Config;
import co.cask.cdap.api.Resources;
import co.cask.cdap.etl.api.Transform;
import co.cask.cdap.etl.proto.ArtifactSelectorConfig;
import co.cask.cdap.etl.proto.Connection;
import co.cask.cdap.etl.proto.UpgradeContext;
import co.cask.cdap.etl.proto.UpgradeableConfig;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import javax.annotation.Nullable;
/**
* Common ETL Config.
*/
// though not marked nullable, fields can be null since these objects are created through gson deserialization
@SuppressWarnings("ConstantConditions")
public class ETLConfig extends Config implements UpgradeableConfig {
private final Set<ETLStage> stages;
private final Set<Connection> connections;
private final Resources resources;
private final Boolean stageLoggingEnabled;
// v1 fields to support backwards compatibility
private final co.cask.cdap.etl.proto.v1.ETLStage source;
private final List<co.cask.cdap.etl.proto.v1.ETLStage> sinks;
private final List<co.cask.cdap.etl.proto.v1.ETLStage> transforms;
protected ETLConfig(Set<ETLStage> stages, Set<Connection> connections,
Resources resources, boolean stageLoggingEnabled) {
this.stages = Collections.unmodifiableSet(stages);
this.connections = Collections.unmodifiableSet(connections);
this.resources = resources;
this.stageLoggingEnabled = stageLoggingEnabled;
// these fields are only here for backwards compatibility
this.source = null;
this.sinks = new ArrayList<>();
this.transforms = new ArrayList<>();
}
public Set<ETLStage> getStages() {
return Collections.unmodifiableSet(stages == null ? new HashSet<ETLStage>() : stages);
}
public Set<Connection> getConnections() {
return Collections.unmodifiableSet(connections == null ? new HashSet<Connection>() : connections);
}
public Resources getResources() {
return resources == null ? new Resources() : resources;
}
public boolean isStageLoggingEnabled() {
return stageLoggingEnabled == null ? true : stageLoggingEnabled;
}
/**
* Validate correctness. Since this object is created through deserialization, some fields that should not be null
* may be null. Only validates field correctness, not logical correctness.
*
* @throws IllegalArgumentException if the object is invalid
*/
public void validate() {
for (ETLStage stage : getStages()) {
stage.validate();
}
}
/**
* Converts the source, transforms, sinks, connections and resources from old style config into their
* new forms.
*/
protected <T extends Builder> T convertStages(T builder, String sourceType, String sinkType) {
builder
.setResources(getResources())
.addConnections(getConnections());
if (!isStageLoggingEnabled()) {
builder.disableStageLogging();
}
UpgradeContext dummyUpgradeContext = new UpgradeContext() {
@Nullable
@Override
public ArtifactSelectorConfig getPluginArtifact(String pluginType, String pluginName) {
return null;
}
};
if (source == null) {
throw new IllegalArgumentException("Pipeline does not contain a source.");
}
builder.addStage(source.upgradeStage(sourceType, dummyUpgradeContext));
if (transforms != null) {
for (co.cask.cdap.etl.proto.v1.ETLStage v1Stage : transforms) {
builder.addStage(v1Stage.upgradeStage(Transform.PLUGIN_TYPE, dummyUpgradeContext));
}
}
if (sinks == null || sinks.isEmpty()) {
throw new IllegalArgumentException("Pipeline does not contain any sinks.");
}
for (co.cask.cdap.etl.proto.v1.ETLStage v1Stage : sinks) {
builder.addStage(v1Stage.upgradeStage(sinkType, dummyUpgradeContext));
}
return builder;
}
@Override
public String toString() {
return "ETLConfig{" +
"stageLoggingEnabled=" + stageLoggingEnabled +
", stages=" + stages +
", resources=" + resources +
"} " + super.toString();
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
ETLConfig that = (ETLConfig) o;
return Objects.equals(stages, that.stages) &&
Objects.equals(resources, that.resources) &&
isStageLoggingEnabled() == that.isStageLoggingEnabled();
}
@Override
public int hashCode() {
return Objects.hash(stages, resources, isStageLoggingEnabled());
}
@Override
public boolean canUpgrade() {
return false;
}
@Override
public UpgradeableConfig upgrade(UpgradeContext upgradeContext) {
throw new UnsupportedOperationException("This is the latest config and cannot be upgraded.");
}
/**
* Builder for creating configs.
*/
@SuppressWarnings("unchecked")
public abstract static class Builder<T extends Builder> {
protected Set<ETLStage> stages;
protected Set<Connection> connections;
protected Resources resources;
protected Boolean stageLoggingEnabled;
protected Builder() {
this.stages = new HashSet<>();
this.connections = new HashSet<>();
this.resources = new Resources();
this.stageLoggingEnabled = true;
}
public T addStage(ETLStage stage) {
stages.add(stage);
return (T) this;
}
public T addConnection(String from, String to) {
this.connections.add(new Connection(from, to));
return (T) this;
}
public T addConnection(Connection connection) {
this.connections.add(connection);
return (T) this;
}
public T addConnections(Collection<Connection> connections) {
this.connections.addAll(connections);
return (T) this;
}
public T setResources(Resources resources) {
this.resources = resources;
return (T) this;
}
public T disableStageLogging() {
this.stageLoggingEnabled = false;
return (T) this;
}
}
}