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Copy pathDataLoaderCompanyProductBackend.java
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118 lines (88 loc) · 3.47 KB
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package graphql.execution.instrumentation.dataloader;
import com.google.common.collect.ImmutableList;
import org.dataloader.BatchLoader;
import org.dataloader.DataLoader;
import org.dataloader.DataLoaderFactory;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.stream.Collectors;
import static java.util.Objects.requireNonNull;
public class DataLoaderCompanyProductBackend {
private final ConcurrentMap<UUID, Company> companies = new ConcurrentHashMap<>();
private final ConcurrentMap<UUID, Project> projects = new ConcurrentHashMap<>();
private final DataLoader<UUID, List<Project>> projectsLoader;
public DataLoaderCompanyProductBackend(int companyCount, int projectCount) {
for (int i = 0; i < companyCount; i++) {
mkCompany(projectCount);
}
BatchLoader<UUID, List<Project>> uuidListBatchLoader = keys -> getProjectsForCompanies(keys).thenApply(projects -> keys
.stream()
.map(companyId -> projects.stream()
.filter(project -> project.getCompanyId().equals(companyId))
.collect(Collectors.toList()))
.collect(Collectors.toList()));
projectsLoader = DataLoaderFactory.newDataLoader(uuidListBatchLoader);
}
private Company mkCompany(int projectCount) {
Company company = new Company();
companies.put(company.getId(), company);
for (int j = 0; j < projectCount; j++) {
Project project = new Project(company.getId());
projects.put(project.getId(), project);
}
return company;
}
public DataLoader<UUID, List<Project>> getProjectsLoader() {
return projectsLoader;
}
public CompletableFuture<List<Company>> getCompanies() {
return CompletableFuture.supplyAsync(this::companiesList);
}
private List<Company> companiesList() {
return ImmutableList.copyOf(companies.values());
}
public CompletableFuture<List<Project>> getProjectsForCompanies(List<UUID> companyIds) {
return CompletableFuture.supplyAsync(() -> projects.values().stream()
.filter(project -> companyIds.contains(project.getCompanyId()))
.collect(Collectors.collectingAndThen(Collectors.toList(), ImmutableList::copyOf)));
}
public CompletableFuture<Company> addCompany() {
return CompletableFuture.supplyAsync(() -> mkCompany(3));
}
public static class Company {
private final UUID id;
private final String name;
public Company() {
id = UUID.randomUUID();
name = "Company " + id.toString().substring(0, 8);
}
public UUID getId() {
return id;
}
public String getName() {
return name;
}
}
public static class Project {
private final UUID id;
private final String name;
private final UUID companyId;
public Project(UUID companyId) {
id = UUID.randomUUID();
name = "Project " + id.toString().substring(0, 8);
this.companyId = requireNonNull(companyId);
}
public UUID getId() {
return id;
}
public String getName() {
return name;
}
public UUID getCompanyId() {
return companyId;
}
}
}