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Merged
merged 2 commits into from
Sep 28, 2025
Merged

feat: add support for MCP resource templates #62

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a9651e1
feat: add support for MCP resource templates
tzolov Sep 25, 2025
772ac98
re-align with the java-sdk
tzolov Sep 27, 2025
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9 changes: 8 additions & 1 deletion ...ommunity/mcp/provider/ProvidrerUtils.java → ...munity/mcp/provider/McpProviderUtils.java
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Original file line number Diff line number Diff line change
Expand Up @@ -18,12 +18,19 @@

import java.lang.reflect.Method;
import java.util.function.Predicate;
import java.util.regex.Pattern;

import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

public class ProvidrerUtils {
public class McpProviderUtils {

private static final Pattern URI_VARIABLE_PATTERN = Pattern.compile("\\{([^/]+?)\\}");

public static boolean isUriTemplate(String uri) {
return URI_VARIABLE_PATTERN.matcher(uri).find();
}

public final static Predicate<Method> isReactiveReturnType = method -> Mono.class
.isAssignableFrom(method.getReturnType()) || Flux.class.isAssignableFrom(method.getReturnType())
Expand Down
73 changes: 67 additions & 6 deletions ...s/src/main/java/org/springaicommunity/mcp/provider/resource/AsyncMcpResourceProvider.java
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Expand Up @@ -18,21 +18,23 @@

import java.lang.reflect.Method;
import java.util.List;
import java.util.Objects;
import java.util.function.BiFunction;
import java.util.stream.Stream;

import org.reactivestreams.Publisher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springaicommunity.mcp.annotation.McpResource;
import org.springaicommunity.mcp.method.resource.AsyncMcpResourceMethodCallback;

import io.modelcontextprotocol.server.McpAsyncServerExchange;
import io.modelcontextprotocol.server.McpServerFeatures.AsyncResourceSpecification;
import io.modelcontextprotocol.server.McpServerFeatures.AsyncResourceTemplateSpecification;
import io.modelcontextprotocol.spec.McpSchema;
import io.modelcontextprotocol.spec.McpSchema.ReadResourceRequest;
import io.modelcontextprotocol.spec.McpSchema.ReadResourceResult;
import io.modelcontextprotocol.util.Assert;
import org.reactivestreams.Publisher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springaicommunity.mcp.annotation.McpResource;
import org.springaicommunity.mcp.method.resource.AsyncMcpResourceMethodCallback;
import org.springaicommunity.mcp.provider.McpProviderUtils;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

Expand Down Expand Up @@ -79,6 +81,11 @@ public List<AsyncResourceSpecification> getResourceSpecifications() {
var resourceAnnotation = doGetMcpResourceAnnotation(mcpResourceMethod);

var uri = resourceAnnotation.uri();

if (McpProviderUtils.isUriTemplate(uri)) {
return null;
}

var name = getName(mcpResourceMethod, resourceAnnotation);
var description = resourceAnnotation.description();
var mimeType = resourceAnnotation.mimeType();
Expand All @@ -101,6 +108,60 @@ public List<AsyncResourceSpecification> getResourceSpecifications() {

return resourceSpec;
})
.filter(Objects::nonNull)
.toList())
.flatMap(List::stream)
.toList();

if (resourceSpecs.isEmpty()) {
logger.warn("No resource methods found in the provided resource objects: {}", this.resourceObjects);
}

return resourceSpecs;
}

public List<AsyncResourceTemplateSpecification> getResourceTemplateSpecifications() {

List<AsyncResourceTemplateSpecification> resourceSpecs = this.resourceObjects.stream()
.map(resourceObject -> Stream.of(doGetClassMethods(resourceObject))
.filter(method -> method.isAnnotationPresent(McpResource.class))
.filter(method -> Mono.class.isAssignableFrom(method.getReturnType())
|| Flux.class.isAssignableFrom(method.getReturnType())
|| Publisher.class.isAssignableFrom(method.getReturnType()))
.sorted((m1, m2) -> m1.getName().compareTo(m2.getName()))
.map(mcpResourceMethod -> {

var resourceAnnotation = doGetMcpResourceAnnotation(mcpResourceMethod);

var uri = resourceAnnotation.uri();

if (!McpProviderUtils.isUriTemplate(uri)) {
return null;
}

var name = getName(mcpResourceMethod, resourceAnnotation);
var description = resourceAnnotation.description();
var mimeType = resourceAnnotation.mimeType();

var mcpResourceTemplate = McpSchema.ResourceTemplate.builder()
.uriTemplate(uri)
.name(name)
.description(description)
.mimeType(mimeType)
.build();

BiFunction<McpAsyncServerExchange, ReadResourceRequest, Mono<ReadResourceResult>> methodCallback = AsyncMcpResourceMethodCallback
.builder()
.method(mcpResourceMethod)
.bean(resourceObject)
.resource(mcpResourceTemplate)
.build();

var resourceSpec = new AsyncResourceTemplateSpecification(mcpResourceTemplate, methodCallback);

return resourceSpec;
})
.filter(Objects::nonNull)
.toList())
.flatMap(List::stream)
.toList();
Expand Down
63 changes: 62 additions & 1 deletion ...n/java/org/springaicommunity/mcp/provider/resource/AsyncStatelessMcpResourceProvider.java
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Expand Up @@ -18,6 +18,7 @@

import java.lang.reflect.Method;
import java.util.List;
import java.util.Objects;
import java.util.function.BiFunction;
import java.util.stream.Stream;

Expand All @@ -26,8 +27,9 @@
import org.slf4j.LoggerFactory;
import org.springaicommunity.mcp.annotation.McpResource;
import org.springaicommunity.mcp.method.resource.AsyncStatelessMcpResourceMethodCallback;

import org.springaicommunity.mcp.provider.McpProviderUtils;
import io.modelcontextprotocol.server.McpStatelessServerFeatures.AsyncResourceSpecification;
import io.modelcontextprotocol.server.McpStatelessServerFeatures.AsyncResourceTemplateSpecification;
import io.modelcontextprotocol.common.McpTransportContext;
import io.modelcontextprotocol.spec.McpSchema;
import io.modelcontextprotocol.spec.McpSchema.ReadResourceRequest;
Expand Down Expand Up @@ -79,6 +81,11 @@ public List<AsyncResourceSpecification> getResourceSpecifications() {
var resourceAnnotation = doGetMcpResourceAnnotation(mcpResourceMethod);

var uri = resourceAnnotation.uri();

if (McpProviderUtils.isUriTemplate(uri)) {
return null;
}

var name = getName(mcpResourceMethod, resourceAnnotation);
var description = resourceAnnotation.description();
var mimeType = resourceAnnotation.mimeType();
Expand All @@ -101,6 +108,60 @@ public List<AsyncResourceSpecification> getResourceSpecifications() {

return resourceSpec;
})
.filter(Objects::nonNull)
.toList())
.flatMap(List::stream)
.toList();

if (resourceSpecs.isEmpty()) {
logger.warn("No resource methods found in the provided resource objects: {}", this.resourceObjects);
}

return resourceSpecs;
}

public List<AsyncResourceTemplateSpecification> getResourceTemplateSpecifications() {

List<AsyncResourceTemplateSpecification> resourceSpecs = this.resourceObjects.stream()
.map(resourceObject -> Stream.of(doGetClassMethods(resourceObject))
.filter(method -> method.isAnnotationPresent(McpResource.class))
.filter(method -> Mono.class.isAssignableFrom(method.getReturnType())
|| Flux.class.isAssignableFrom(method.getReturnType())
|| Publisher.class.isAssignableFrom(method.getReturnType()))
.sorted((m1, m2) -> m1.getName().compareTo(m2.getName()))
.map(mcpResourceMethod -> {

var resourceAnnotation = doGetMcpResourceAnnotation(mcpResourceMethod);

var uri = resourceAnnotation.uri();

if (!McpProviderUtils.isUriTemplate(uri)) {
return null;
}

var name = getName(mcpResourceMethod, resourceAnnotation);
var description = resourceAnnotation.description();
var mimeType = resourceAnnotation.mimeType();

var mcpResource = McpSchema.ResourceTemplate.builder()
.uriTemplate(uri)
.name(name)
.description(description)
.mimeType(mimeType)
.build();

BiFunction<McpTransportContext, ReadResourceRequest, Mono<ReadResourceResult>> methodCallback = AsyncStatelessMcpResourceMethodCallback
.builder()
.method(mcpResourceMethod)
.bean(resourceObject)
.resource(mcpResource)
.build();

var resourceSpec = new AsyncResourceTemplateSpecification(mcpResource, methodCallback);

return resourceSpec;
})
.filter(Objects::nonNull)
.toList())
.flatMap(List::stream)
.toList();
Expand Down
53 changes: 52 additions & 1 deletion ...ns/src/main/java/org/springaicommunity/mcp/provider/resource/SyncMcpResourceProvider.java
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Expand Up @@ -18,12 +18,14 @@

import java.lang.reflect.Method;
import java.util.List;
import java.util.Objects;
import java.util.stream.Stream;

import org.springaicommunity.mcp.annotation.McpResource;
import org.springaicommunity.mcp.method.resource.SyncMcpResourceMethodCallback;

import org.springaicommunity.mcp.provider.McpProviderUtils;
import io.modelcontextprotocol.server.McpServerFeatures.SyncResourceSpecification;
import io.modelcontextprotocol.server.McpServerFeatures.SyncResourceTemplateSpecification;
import io.modelcontextprotocol.spec.McpSchema;
import io.modelcontextprotocol.util.Assert;
import reactor.core.publisher.Mono;
Expand All @@ -50,6 +52,11 @@ public List<SyncResourceSpecification> getResourceSpecifications() {
var resourceAnnotation = mcpResourceMethod.getAnnotation(McpResource.class);

var uri = resourceAnnotation.uri();

if (McpProviderUtils.isUriTemplate(uri)) {
return null;
}

var name = getName(mcpResourceMethod, resourceAnnotation);
var description = resourceAnnotation.description();
var mimeType = resourceAnnotation.mimeType();
Expand All @@ -69,6 +76,50 @@ public List<SyncResourceSpecification> getResourceSpecifications() {

return new SyncResourceSpecification(mcpResource, methodCallback);
})
.filter(Objects::nonNull)
.toList())
.flatMap(List::stream)
.toList();

return methodCallbacks;
}

public List<SyncResourceTemplateSpecification> getResourceTemplateSpecifications() {

List<SyncResourceTemplateSpecification> methodCallbacks = this.resourceObjects.stream()
.map(resourceObject -> Stream.of(this.doGetClassMethods(resourceObject))
.filter(resourceMethod -> resourceMethod.isAnnotationPresent(McpResource.class))
.filter(method -> !Mono.class.isAssignableFrom(method.getReturnType()))
.sorted((m1, m2) -> m1.getName().compareTo(m2.getName()))
.map(mcpResourceMethod -> {
var resourceAnnotation = mcpResourceMethod.getAnnotation(McpResource.class);

var uri = resourceAnnotation.uri();

if (!McpProviderUtils.isUriTemplate(uri)) {
return null;
}

var name = getName(mcpResourceMethod, resourceAnnotation);
var description = resourceAnnotation.description();
var mimeType = resourceAnnotation.mimeType();

var mcpResourceTemplate = McpSchema.ResourceTemplate.builder()
.uriTemplate(uri)
.name(name)
.description(description)
.mimeType(mimeType)
.build();

var methodCallback = SyncMcpResourceMethodCallback.builder()
.method(mcpResourceMethod)
.bean(resourceObject)
.resource(mcpResourceTemplate)
.build();

return new SyncResourceTemplateSpecification(mcpResourceTemplate, methodCallback);
})
.filter(Objects::nonNull)
.toList())
.flatMap(List::stream)
.toList();
Expand Down
61 changes: 60 additions & 1 deletion ...in/java/org/springaicommunity/mcp/provider/resource/SyncStatelessMcpResourceProvider.java
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Original file line number Diff line number Diff line change
Expand Up @@ -18,14 +18,16 @@

import java.lang.reflect.Method;
import java.util.List;
import java.util.Objects;
import java.util.function.BiFunction;
import java.util.stream.Stream;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springaicommunity.mcp.annotation.McpResource;
import org.springaicommunity.mcp.method.resource.SyncStatelessMcpResourceMethodCallback;

import org.springaicommunity.mcp.provider.McpProviderUtils;
import io.modelcontextprotocol.server.McpStatelessServerFeatures.SyncResourceTemplateSpecification;
import io.modelcontextprotocol.server.McpStatelessServerFeatures.SyncResourceSpecification;
import io.modelcontextprotocol.common.McpTransportContext;
import io.modelcontextprotocol.spec.McpSchema;
Expand Down Expand Up @@ -75,6 +77,11 @@ public List<SyncResourceSpecification> getResourceSpecifications() {
var resourceAnnotation = doGetMcpResourceAnnotation(mcpResourceMethod);

var uri = resourceAnnotation.uri();

if (McpProviderUtils.isUriTemplate(uri)) {
return null;
}

var name = getName(mcpResourceMethod, resourceAnnotation);
var description = resourceAnnotation.description();
var mimeType = resourceAnnotation.mimeType();
Expand All @@ -97,6 +104,58 @@ public List<SyncResourceSpecification> getResourceSpecifications() {

return resourceSpec;
})
.filter(Objects::nonNull)
.toList())
.flatMap(List::stream)
.toList();

if (resourceSpecs.isEmpty()) {
logger.warn("No resource methods found in the provided resource objects: {}", this.resourceObjects);
}

return resourceSpecs;
}

public List<SyncResourceTemplateSpecification> getResourceTemplateSpecifications() {

List<SyncResourceTemplateSpecification> resourceSpecs = this.resourceObjects.stream()
.map(resourceObject -> Stream.of(doGetClassMethods(resourceObject))
.filter(method -> method.isAnnotationPresent(McpResource.class))
.filter(method -> !Mono.class.isAssignableFrom(method.getReturnType()))
.sorted((m1, m2) -> m1.getName().compareTo(m2.getName()))
.map(mcpResourceMethod -> {

var resourceAnnotation = doGetMcpResourceAnnotation(mcpResourceMethod);

var uri = resourceAnnotation.uri();

if (!McpProviderUtils.isUriTemplate(uri)) {
return null;
}

var name = getName(mcpResourceMethod, resourceAnnotation);
var description = resourceAnnotation.description();
var mimeType = resourceAnnotation.mimeType();

var mcpResource = McpSchema.ResourceTemplate.builder()
.uriTemplate(uri)
.name(name)
.description(description)
.mimeType(mimeType)
.build();

BiFunction<McpTransportContext, ReadResourceRequest, ReadResourceResult> methodCallback = SyncStatelessMcpResourceMethodCallback
.builder()
.method(mcpResourceMethod)
.bean(resourceObject)
.resource(mcpResource)
.build();

var resourceSpec = new SyncResourceTemplateSpecification(mcpResource, methodCallback);

return resourceSpec;
})
.filter(Objects::nonNull)
.toList())
.flatMap(List::stream)
.toList();
Expand Down
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