tessl/maven-dev-langchain4j--langchain4j-ollama
Java integration library enabling LangChain4j applications to use Ollama's local language models with support for chat, streaming, embeddings, and advanced reasoning features
types.mddocs/
Supporting Types
This document covers the supporting types used for Ollama model metadata and information.
OllamaModel
Represents an Ollama model with its basic metadata.
Class Signature
package dev.langchain4j.model.ollama;
public class OllamaModelMutability: Mutable (has setters)
Thread Safety: Not thread-safe; synchronize if shared across threads
Nullability: All fields can be null
Public Methods
Getters
public String getName()Returns the model name.
Returns: String - Model name (e.g., "llama2", "mistral")
- May be null
public long getSize()Returns the model size in bytes.
Returns: long - Model size
- Always >= 0
public String getDigest()Returns the model's content digest (SHA256 hash).
Returns: String - SHA256 digest
- May be null
public OllamaModelDetails getDetails()Returns the technical details of the model.
Returns: OllamaModelDetails - Model details
- May be null
public OffsetDateTime getModifiedAt()Returns the last modification timestamp.
Returns: OffsetDateTime - Modification time
- May be null
OllamaModelDetails
Represents technical details about an Ollama model's architecture and quantization.
Class Signature
package dev.langchain4j.model.ollama;
public class OllamaModelDetailsMutability: Mutable (has setters)
Thread Safety: Not thread-safe
Nullability: All fields can be null
Public Methods
public String getFormat()Returns the model file format.
Returns: String - Format (e.g., "gguf", "ggml")
- May be null
public String getFamily()Returns the model family.
Returns: String - Family name (e.g., "llama", "mistral")
- May be null
public String getParameterSize()Returns the parameter size description.
Returns: String - Size (e.g., "7B", "13B", "70B")
- May be null
public String getQuantizationLevel()Returns the quantization level.
Returns: String - Quantization (e.g., "Q4_0", "Q5_K_M", "F16")
- May be null
Common Quantization Levels
| Level | Bits | Quality | Size | Use Case |
|---|---|---|---|---|
F16 | 16 | Very High | Very Large | High quality |
Q8_0 | 8 | High | Large | Production |
Q5_K_M | 5 | Good | Medium | Balanced |
Q4_K_M | 4 | Acceptable | Small | Fast inference |
Q4_0 | 4 | Lower | Smallest | Resource-constrained |
OllamaModelCard
Represents detailed information about an Ollama model including license, template, and capabilities.
Class Signature
package dev.langchain4j.model.ollama;
public class OllamaModelCardMutability: Mutable (has setters)
Thread Safety: Not thread-safe
Nullability: All fields can be null
Public Methods
public String getLicense()Returns the model's license information.
Returns: String - License (e.g., "Apache 2.0", "MIT")
- May be null
public String getTemplate()Returns the model's prompt template.
Returns: String - Template (e.g., "{{ .Prompt }}")
- May be null
public OllamaModelDetails getDetails()Returns the technical details of the model.
Returns: OllamaModelDetails - Model details
- May be null
RunningOllamaModel
Represents a currently running Ollama model instance with runtime state information.
Class Signature
package dev.langchain4j.model.ollama;
public class RunningOllamaModelMutability: Mutable (has setters)
Thread Safety: Not thread-safe
Nullability: All fields can be null
Public Methods
public String getName()Returns the name of the running model.
Returns: String - Model name (e.g., "llama2", "mistral")
- May be null
public String getModel()Returns the full model identifier.
Returns: String - Model identifier
- May be null
public long getSize()Returns the model size in bytes.
Returns: long - Model size in memory
- Always >= 0
public String getDigest()Returns the model's content digest.
Returns: String - SHA256 digest
- May be null
public OllamaModelDetails getDetails()Returns the technical details of the model.
Returns: OllamaModelDetails - Model details
- May be null
public OffsetDateTime getExpiresAt()Returns when the model will be unloaded from memory.
Returns: OffsetDateTime - Expiration timestamp
- May be null if model persists indefinitely
See Also
- Model Management - Using these types for model management
Install with Tessl CLI
npx tessl i tessl/maven-dev-langchain4j--langchain4j-ollama